{"id":"CVE-2011-5094","aliases":["BELL-CVE-2011-5094","EUVD-2011-4994","GHSA-m896-wg3p-7ffv"],"status":"disputed","title":"** DISPUTED ** Mozilla Network Security Services (NSS) 3.x, with certain settings of the...","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","severity":{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.02666,"percentile":0.8582,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2012-06-16T21:00:00Z","modified":"2026-06-16T23:35:56Z","products":[{"vendor":"mozilla","product":"network_security_services"}],"references":[{"url":"http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.ietf.org/mail-archive/web/tls/current/msg07567.html","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"http://www.ietf.org/mail-archive/web/tls/current/msg07577.html","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=707065","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.openwall.com/lists/oss-security/2011/07/08/2","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"http://www.ietf.org/mail-archive/web/tls/current/msg07576.html","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"http://orchilles.com/2011/03/ssl-renegotiation-dos.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.ietf.org/mail-archive/web/tls/current/msg07553.html","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"http://www.ietf.org/mail-archive/web/tls/current/msg07564.html","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-5094"},{"url":"https://github.com/advisories/GHSA-m896-wg3p-7ffv"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2011-5094","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2011-5094","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","status":"disputed","published":"2012-06-16T21:00:00Z","modified":"2024-09-16T21:56:51.299Z","updated_at":"2026-11-02T14:35:35.912488Z"}],"euvd":[{"id":"EUVD-2011-4994","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","status":"published","published":"2012-06-16T21:00:00Z","modified":"2024-09-16T21:56:51Z","updated_at":"2026-11-03T00:55:07.221362Z"}],"ghsa":[{"id":"GHSA-m896-wg3p-7ffv","title":"** DISPUTED ** Mozilla Network Security Services (NSS) 3.x, with certain settings of the...","description":"** DISPUTED ** 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.","status":"published","published":"2022-05-17T05:28:31Z","modified":"2023-01-28T05:04:17Z","updated_at":"2026-11-02T14:44:08.629318Z"}],"nvd":[{"id":"CVE-2011-5094","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","status":"disputed","published":"2012-06-16T21:55:02.5Z","modified":"2026-06-16T23:35:56.103Z","cvss":[{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:02:12.272092Z"}],"osv":[{"id":"BELL-CVE-2011-5094","title":"CVE-2011-5094 does not affect BellSoft software","status":"withdrawn","published":"2012-06-16T21:55:00Z","modified":"2026-01-28T07:21:15.763946Z","cvss":[{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium"}],"updated_at":"2026-11-02T15:28:12.886815Z"}]}}