Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

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, which allows remote attackers to bypass authentication by using the EAP-TLS protocol with a revoked X.509 client certificate.

Security Impact Summary

CVE-2011-2701 is a security vulnerability that . Impacting 1 product from freeradius organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2011, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2011-08-04T02:45:32.297

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 5.8 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

4.9

Weaknesses

Type: Primary
CWE-287

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	freeradius	freeradius	2.1.11	Yes

References

http://secunia.com/advisories/45425 Vendor Advisory ([email protected])
http://securityreason.com/securityalert/8325 ([email protected])
http://securitytracker.com/id?1025833 ([email protected])
http://www.openwall.com/lists/oss-security/2011/07/15/6 ([email protected])
http://www.openwall.com/lists/oss-security/2011/07/18/2 ([email protected])
http://www.openwall.com/lists/oss-security/2011/07/20/9 ([email protected])
http://www.securityfocus.com/archive/1/518974/100/0/threaded ([email protected])
http://www.securityfocus.com/bid/48880 ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=724815 Patch ([email protected])
https://exchange.xforce.ibmcloud.com/vulnerabilities/68782 ([email protected])
https://www.dfn-cert.de/informationen/Sicherheitsbulletins/dsb-2011-01.html ([email protected])
http://secunia.com/advisories/45425 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://securityreason.com/securityalert/8325 (af854a3a-2127-422b-91ae-364da2661108)
http://securitytracker.com/id?1025833 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2011/07/15/6 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2011/07/18/2 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2011/07/20/9 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/archive/1/518974/100/0/threaded (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/48880 (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=724815 Patch (af854a3a-2127-422b-91ae-364da2661108)
https://exchange.xforce.ibmcloud.com/vulnerabilities/68782 (af854a3a-2127-422b-91ae-364da2661108)
https://www.dfn-cert.de/informationen/Sicherheitsbulletins/dsb-2011-01.html (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For freeradius's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.