CVE-2011-5094
Mozilla Network Security Services (NSS) 3.x, with certain settings of the SSL_ENABLE_RENEGOTIATION option, does not properly restrict client-initiated renegotiation within the SSL and TLS protocols, which might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection, a different vulnerability than CVE-2011-1473. NOTE: it can also be argued that it is the responsibility of server deployments, not a security library, to prevent or limit renegotiation when it is inappropriate within a specific environment
Key facts
- CVSS score
- 4.3 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:P- EPSS score
- 2.7% (86th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-4994)
- Published
- June 16, 2012
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-4994 in the EU Vulnerability Database. Last updated in EUVD on September 16, 2024.
View on the EU Vulnerability DatabaseAffected products
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
- mozilla / network security services
References
- http://orchilles.com/2011/03/ssl-renegotiation-dos.html
- http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html
- http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html
- http://www.ietf.org/mail-archive/web/tls/current/msg07553.html
- http://www.ietf.org/mail-archive/web/tls/current/msg07564.html
- http://www.ietf.org/mail-archive/web/tls/current/msg07567.html
- http://www.ietf.org/mail-archive/web/tls/current/msg07576.html
- http://www.ietf.org/mail-archive/web/tls/current/msg07577.html
- http://www.openwall.com/lists/oss-security/2011/07/08/2
- https://bugzilla.redhat.com/show_bug.cgi?id=707065
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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