CVE-2020-11653
mediumpriority · track · 31EPSS 0.022 · 82 %ileDEEUUSEPSS · scored 2026-10-27
An issue was discovered in Varnish Cache before 6.0.6 LTS, 6.1.x and 6.2.x before 6.2.3, and 6.3.x before 6.3.2. It occurs when communication with a TLS termination proxy uses PROXY version 2. There can be an assertion failure and daemon restart, which causes a performance loss.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- Fixedvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.src (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-devel-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-devel-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-devel-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-devel-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-docs-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-docs-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-docs-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-docs-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.src (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-debuginfo-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-debuginfo-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-debuginfo-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-debuginfo-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Fixedvarnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)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-2020:4756 - Workaroundvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.src (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-devel-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-devel-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-devel-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-devel-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-docs-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-docs-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-docs-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-docs-0:6.0.6-2.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.src (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-debuginfo-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-debuginfo-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-debuginfo-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-debuginfo-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.aarch64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.ppc64le (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.s390x (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
- Workaroundvarnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64 (varnish:6) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (42)
Products and version ranges known to be affected.
- NetApp ActiveIQ Unified Managerall versionscert_bundDEcpe:/a:netapp:active_iq_unified_manager:-::~~~vmware_vsphere~~
- varnish-software varnish cache6.0.0 → 6.0.6nvdUScpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*
advisories (2)
Vendor and ecosystem advisories describing this.
- RHSA-2020:4756Red Hat Security Advisory: varnish:6 security, bug fix, and enhancement update2020-11-04csaf · redhat_csafUS
An update for the varnish:6 module is now available for Red Hat Enterprise Linux 8. 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.
- WID-SEC-W-2022-0193Red Hat Enterprise Linux: Mehrere SchwachstellenDeutsch2020-11-03csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um die Verfügbarkeit, Integrität und Vertraulichkeit zu gefährden.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (20)
External citations — patches, advisories, analysis.
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.htmlcnnvd
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.htmlcnnvd
- https://lists.debian.org/debian-lts-announce/2022/11/msg00036.htmlcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2020-11653cnnvd
- https://packetstormsecurity.com/files/159872/Red-Hat-Security-Advisory-2020-4756-01.htmlcnnvd
- https://packetstormsecurity.com/files/167452/Ubuntu-Security-Notice-USN-5474-1.htmlcnnvd
- https://packetstormsecurity.com/files/168184/Ubuntu-Security-Notice-USN-5474-2.htmlcnnvd
- https://varnish-cache.org/security/VSV00005.html#vsv00005cnnvd
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