CVE-2018-20102

mediumpriority · track · 31EPSS 0.042 · 91 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

4.15% (91st) EPSS

CVSS 5 · medium

Is it mine?

48 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · redhat_csaf

EPSS · scored 2026-10-27

An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.

remediations

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

A vendor fix is available.

Fixedhaproxy-0:1.8.17-3.el7.src as a component of Red Hat OpenShift Container Platform 3.9redhat_csaf
Before applying this update, ensure all previously released errata relevant to your system have been applied. See the following documentation for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/3.9/release_notes/ocp_3_9_release_notes.html This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258.
https://access.redhat.com/errata/RHSA-2019:0547
Fixedhaproxy-debuginfo-0:1.8.17-3.el7.x86_64 as a component of Red Hat OpenShift Container Platform 3.9redhat_csaf
Before applying this update, ensure all previously released errata relevant to your system have been applied. See the following documentation for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/3.9/release_notes/ocp_3_9_release_notes.html This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258.
https://access.redhat.com/errata/RHSA-2019:0547
Fixedhaproxy18-0:1.8.17-3.el7.x86_64 as a component of Red Hat OpenShift Container Platform 3.9redhat_csaf
Before applying this update, ensure all previously released errata relevant to your system have been applied. See the following documentation for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/3.9/release_notes/ocp_3_9_release_notes.html This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258.
https://access.redhat.com/errata/RHSA-2019:0547
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.src as a component of Red Hat Software Collections for 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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.src as a component of Red Hat Software Collections for 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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for 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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for 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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-debuginfo-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for 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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-debuginfo-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-debuginfo-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-debuginfo-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-debuginfo-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for 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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-syspaths-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for 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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-syspaths-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-syspaths-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-syspaths-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)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
https://access.redhat.com/errata/RHSA-2019:1436
Fixedrh-haproxy18-haproxy-syspaths-0:1.8.17-1.el7.x86_64 as a component of Red Hat Software Collections for 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
https://access.redhat.com/errata/RHSA-2019:1436

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:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

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

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nsecondary · FSTEC (BDU) RU

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

v3.06.5mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Lsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USprimaryCWE-125USCWE-125US

affected products (48)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Canonical Ltd. Ubuntu≤ 16.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 18.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 18.10fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.0fstec_bduRU
Novell Inc. SUSE Linux Enterprise High Availability≤ 15fstec_bduRU
Novell Inc. SUSE Linux Enterprise High Availability≤ 15 SP1fstec_bduRU
Red Hat Inc. OpenShift Container Platform≤ 3.10fstec_bduRU
Red Hat Inc. OpenShift Container Platform≤ 3.7fstec_bduRU
Red Hat Inc. OpenShift Container Platform≤ 3.9fstec_bduRU
Red Hat Inc. OpenShift Container Platform≤ 3.11fstec_bduRU
Red Hat Inc. Red Hat Software Collectionsall versionsfstec_bduRU
Willy Terreau HAProxy≤ 1.8.14fstec_bduRU
АО «Концерн ВНИИНС» ОС ОН «Стрелец»≤ 16.01.2023fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Common Edition≤ 2.12 «Орёл»fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.6 «Смоленск»fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition для «Эльбрус»≤ 8.1 «Ленинград»fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 9fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 8fstec_bduRU

showing 20 of 48

advisories (2)

Vendor and ecosystem advisories describing this.

RHSA-2019:0547Red Hat Security Advisory: OpenShift Container Platform 3.9 haproxy security update2019-03-14csaf · redhat_csafUS
An update for haproxy is now available for Red Hat OpenShift Container Platform 3.9. 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.
RHSA-2019:1436Red Hat Security Advisory: rh-haproxy18-haproxy security, bug fix, and enhancement update2019-06-11csaf · redhat_csafUS
An update for rh-haproxy18-haproxy is now available for Red Hat Software Collections. 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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu redhat_csaf NVD CVE.org MITRE

published 2018-12-12modified 2026-06-17

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references (25)

External citations — patches, advisories, analysis.

scry

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