CVE-2011-5094
** DISPUTED ** Mozilla Network Security Services (NSS) 3.x, with certain settings of the...
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
Exploit likelihood
What each source reports
NVD Score used
4.3
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
- Record
CVE-2011-5094- CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
CVE List No score
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
- Record
CVE-2011-5094- Updated
- 2026-11-02
EUVDEUVD-2011-4994 No score
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
- Record
EUVD-2011-4994- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-m896-wg3p-7ffv No score
** DISPUTED ** Mozilla Network Security Services (NSS) 3.x, with certain settings of the...
** 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.
- Record
GHSA-m896-wg3p-7ffv- Updated
- 2026-11-02
OSVBELL-CVE-2011-5094
4.3
CVE-2011-5094 does not affect BellSoft software
- Record
BELL-CVE-2011-5094- CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2011-5094 is a medium vulnerability (CVSS 4.3) in Mozilla Network Security Services, published June 16, 2012. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 2.67%, the 85th percentile.
References
vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html
ietf.org/mail-archive/web/tls/current/msg07567.html
ietf.org/mail-archive/web/tls/current/msg07577.html
bugzilla.redhat.com/show_bug.cgi?id=707065
educatedguesswork.org/2011/10/ssltls_and_computational_dos.html
openwall.com/lists/oss-security/2011/07/08/2
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ietf.org/mail-archive/web/tls/current/msg07576.html
orchilles.com/2011/03/ssl-renegotiation-dos.html
ietf.org/mail-archive/web/tls/current/msg07553.html
ietf.org/mail-archive/web/tls/current/msg07564.html
nvd.nist.gov/vuln/detail/CVE-2011-5094
github.com/advisories/GHSA-m896-wg3p-7ffv
docs.bell-sw.com/security/cves/CVE-2011-5094