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CVE-2011-5094

19
FAUCET Score

CVE-2011-5094 describes a denial-of-service vulnerability in Mozilla Network Security Services (NSS) 3.x, affecting configurations where the SSL_ENABLE_RENEGOTIATION option is set. This flaw allows remote attackers to consume excessive CPU resources by repeatedly initiating renegotiations within a single SSL/TLS connection. The vulnerability has a CVSS score of 4.3, indicating a medium attack complexity (AC:M) and a partial impact on availability (A:P), with no impact on confidentiality or integrity. It is a network-based attack (AV:N) requiring no authentication (Au:N). There is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB. While there is minimal community discussion, the vulnerability is not listed on the KEV catalog and is considered inactive on the Hot List.

Impacted Technologies

VendorProductVersion(s)CPE
3.2CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.2:*:*:*:*:*:*:*
3.2.1CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.2.1:*:*:*:*:*:*:*
3.3CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.3:*:*:*:*:*:*:*
3.3.1CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.3.1:*:*:*:*:*:*:*
3.3.2CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.3.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.71%
Probability of exploitation in next 30 days
EPSS Percentile
84.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0271 is in the 76th percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: nss
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nss
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss

Vendor Advisories (1)

redhatCVE-2011-5094Low

nss: DoS via repeated SSL session renegotiations

Mar 13, 2011

References

orchilles.com / 2011/03/ssl-renegotiation-dos.html
bugzilla.redhat.com / show_bug.cgi
vincent.bernat.im / en/blog/2011-ssl-dos-mitigation.html
educatedguesswork.org / 2011/10/ssltls_and_computational_dos.html
ietf.org / mail-archive/web/tls/current/msg07553.html
ietf.org / mail-archive/web/tls/current/msg07564.html
ietf.org / mail-archive/web/tls/current/msg07567.html
ietf.org / mail-archive/web/tls/current/msg07576.html
ietf.org / mail-archive/web/tls/current/msg07577.html
openwall.com / lists/oss-security/2011/07/08/2