nss: DoS via repeated SSL session renegotiations
Published Jun 16, 2012
4.3
MEDIUMCVSS 2.0
EPSS 2.70%
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
No data.
- 3.2
- 3.2.1
- 3.3
- 3.3.1
- 3.3.2
- 3.4
- 3.4.1
- 3.4.2
- 3.5
- 3.6
- 3.6.1
- 3.7
- 3.7.1
- 3.7.2
- 3.7.3
- 3.7.5
- 3.7.7
- 3.8
- 3.9
- 3.11.2
- 3.11.3
- 3.11.4
- 3.11.5
No data.
Red Hat Enterprise Linux 4
nss
Will not fix
Red Hat Enterprise Linux 5
nss
Will not fix
Red Hat Enterprise Linux 6
nss
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | nss | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | nss | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | nss | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.70% (0.02696) | 85.39th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.71% (0.02706) | 83.97th | v5 (v2026.06.15) |
| Nov 21, 2025 | 3.44% (0.03441) | 87.01th | v4 (v2025.03.14) |
| Sep 15, 2025 | 4.56% (0.04564) | 88.77th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.55% (0.00548) | 65.91th | v4 (v2025.03.14) |
| Dec 12, 2024 | 3.59% (0.03594) | 92.01th | v3 (v2023.03.01) |
| Sep 17, 2024 | 3.59% (0.03594) | 91.81th | v3 (v2023.03.01) |
| May 24, 2024 | 1.00% (0.01000) | 83.59th | v3 (v2023.03.01) |
| May 10, 2024 | 0.84% (0.00842) | 82.01th | v3 (v2023.03.01) |
| Apr 25, 2024 | 0.71% (0.00713) | 80.25th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.73% (0.00731) | 80.30th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.61% (0.00614) | 78.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.59% (0.03594) | 90.20th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.96% (0.01955) | 78.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.96% (0.01955) | 76.59th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.96% (0.01955) | 55.71th | v2 (v2022.01.01) |
No CWE recorded.
References (14)
- http://orchilles.com/2011/03/ssl-renegotiation-dos.html x_refsource_MISC
- http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html x_refsource_MISC
- http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html x_refsource_MISC
- http://www.ietf.org/mail-archive/web/tls/current/msg07553.html mailing-listx_refsource_MLIST
- http://www.ietf.org/mail-archive/web/tls/current/msg07564.html mailing-listx_refsource_MLIST
- http://www.ietf.org/mail-archive/web/tls/current/msg07567.html mailing-listx_refsource_MLIST
- http://www.ietf.org/mail-archive/web/tls/current/msg07576.html mailing-listx_refsource_MLIST
- http://www.ietf.org/mail-archive/web/tls/current/msg07577.html mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2011/07/08/2 mailing-listx_refsource_MLIST
- https://access.redhat.com/security/cve/CVE-2011-5094 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=707065 x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=833118 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-5094
- https://www.cve.org/CVERecord?id=CVE-2011-5094
Change history (0)
No recorded changes yet.