What’s Vulnerable › Vulnerabilities
CVE-2011-1473
- Severity: medium (CVSS 5.0 v2.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 66.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2012-06-16 · updated 2026-06-16
- Weakness: CWE-264
Description
OpenSSL before 0.9.8l, and 0.9.8m through 1.x, 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-2011-5094. 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
- OpenSSL: through 0.9.8k; 0.9.8m, 0.9.8m-beta1, 0.9.8n, 0.9.8o, 0.9.8p, 0.9.8r (+6)
References
- http://archives.neohapsis.com/archives/bugtraq/2014-02/0061.html
- http://marc.info/?l=bugtraq&m=133951357207000&w=2
- 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
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