CVE-2018-1000027

mediumpriority · track · 35EPSS 0.129 · 96 %ileEURUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

12.9% (96th) EPSS

CVSS 5 · medium

Is it mine?

37 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedsquid-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-7:3.5.20-15.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-7:3.5.20-15.el7.src as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-debuginfo-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-migration-script-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-migration-script-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-migration-script-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-migration-script-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-migration-script-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-sysvinit-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-sysvinit-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-sysvinit-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-sysvinit-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Fixedsquid-sysvinit-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:1068
Workaroundsquid-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-7:3.5.20-15.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-7:3.5.20-15.el7.src as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-debuginfo-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-migration-script-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-migration-script-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-migration-script-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-migration-script-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-migration-script-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-sysvinit-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-sysvinit-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-sysvinit-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-sysvinit-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).
Workaroundsquid-sysvinit-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation Optional (v. 7)redhat_csaf
A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.06.9mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.06.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · Red Hat Product Security US

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-476USprimaryCWE-117USCWE-476US

affected products (37)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Squid Software Foundation Squid≤ 4.0.23fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.5 «Смоленск»fstec_bduRU
canonical ubuntu linux= 14.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 16.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 17.10nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
debian debian linux= 7.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 8.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 9.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
squid-cache squid< 4.0.23nvdUScpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
squid-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)all versionsfixedredhat_csafUS
squid-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)all versionsfixedredhat_csafUS
squid-7:3.5.20-15.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7)all versionsfixedredhat_csafUS
squid-7:3.5.20-15.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)all versionsfixedredhat_csafUS
squid-7:3.5.20-15.el7.src as a component of Red Hat Enterprise Linux Workstation (v. 7)all versionsfixedredhat_csafUS
squid-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)all versionsfixedredhat_csafUS
squid-7:3.5.20-15.el7.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)all versionsfixedredhat_csafUS
squid-debuginfo-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)all versionsfixedredhat_csafUS
squid-debuginfo-7:3.5.20-15.el7.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)all versionsfixedredhat_csafUS
squid-debuginfo-7:3.5.20-15.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)all versionsfixedredhat_csafUS

showing 20 of 37

advisories (1)

Vendor and ecosystem advisories describing this.

RHSA-2020:1068Red Hat Security Advisory: squid security and bug fix update2020-03-31csaf · redhat_csafUS
An update for squid is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. [Updated 22 October 2020] This update was found to introduce a bug in cachemgr.cgi that could prevent access to the cache manager. This is not a security regression. The fix is being tracked in https://bugzilla.redhat.com/show_bug.cgi?id=1890581

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd redhat_csaf NVD CVE.org MITRE

published 2018-02-09modified 2026-06-17

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references (30)

External citations — patches, advisories, analysis.

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