What’s Vulnerable › Vulnerabilities

CVE-2011-5094

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2012-06-16 · updated 2026-06-16

Description

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

Affected products

• Mozilla Network Security Services: 3.2, 3.2.1, 3.3, 3.3.1, 3.3.2, 3.4 (+17)

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
• http://orchilles.com/2011/03/ssl-renegotiation-dos.html
• http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html

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