CVE-2020-11653 — An issue was discovered in Varnish Cache before 6
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.
Published
2020-04-08T00:00:00.000Z
Last modified
2024-08-04T11:35:13.694Z
01What is this vulnerability?
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.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2020-04-08T00:00:00.000Z
- Last modified: 2024-08-04T11:35:13.694Z
09References
- varnish-cache.org — https://varnish-cache.org/security/VSV00005.html#vsv00005
- lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html
- lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2022/11/msg00036.html
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