CVE catalog
CVE-2020-11653
varnish: CVE-2020-11653
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 2.16% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | varnish | trixie | 7.7.0-3+deb13u1 | fixed |
| Debian | varnish | trixie-security | 7.7.0-3+deb13u2 | fixed |
| Debian | varnish | bookworm | 7.1.1-2+deb12u1 | fixed |
| Debian | varnish | bookworm-security | 7.1.1-2+deb12u1 | fixed |
| Ubuntu | varnish | 20.04 | 6.1.1-1 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2ubuntu0.1 | fixed |
| Ubuntu | varnish | 20.04 | 6.1.1-1 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2ubuntu0.1 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2ubuntu0.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | varnish | source | trixie | 6.4.0-1 | not yet assigned | Not reported | [956307] |
| Debian | varnish | source | bookworm | 6.4.0-1 | not yet assigned | Not reported | [956307] |
| Ubuntu | varnish | deb | 20.04 | 6.2.1-2ubuntu0.1 | Not reported | UBUNTU-CVE-2020-11653 | Not reported |
| Ubuntu | varnish | deb | 20.04 | 6.2.1-2ubuntu0.2 | Not reported | USN-5474-2 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [libvarnishapi3]Unknown
Source package: [varnish]
Details (4)
7.1.1-2+deb12u1· amd64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
- [libvarnishapi-dev]Unknown
Source package: [varnish]
Details (4)
7.1.1-2+deb12u1· amd64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
- [varnish]Unknown
Details (4)
7.1.1-2+deb12u1· amd64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
- [varnish-doc]Unknown
Source package: [varnish]
Details (4)
7.1.1-2+deb12u1· all · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· all · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· all · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· all · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
[Debian 13 (Trixie)]
- [libvarnishapi3]Unknown
Source package: [varnish]
Details (4)
7.7.0-3+deb13u1· amd64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
- [libvarnishapi-dev]Unknown
Source package: [varnish]
Details (4)
7.7.0-3+deb13u1· amd64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
- [varnish]Unknown
Details (4)
7.7.0-3+deb13u1· amd64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
- [varnish-doc]Unknown
Source package: [varnish]
Details (4)
7.7.0-3+deb13u1· all · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· all · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· all · trixie-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2020:4756]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2020_4756.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-11653]
- [https://osv.dev/vulnerability/DLA-3208-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-11653]
- [https://osv.dev/vulnerability/USN-5474-2]
- [https://security-tracker.debian.org/tracker/CVE-2020-11653]
- [https://wid.cert-bund.de/.well-known/csaf/white/2020/wid-sec-w-2022-0193.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]