{"id":"CVE-2011-1473","aliases":["BELL-CVE-2011-1473","EUVD-2011-1478","GHSA-5wj2-7gqw-v6cm"],"status":"disputed","title":"** DISPUTED ** OpenSSL before 0.9.8l, and 0.9.8m through 1.x, does not properly restrict client...","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","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.66873,"percentile":0.99299,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-264"],"published":"2012-06-16T21:00:00Z","modified":"2026-06-16T23:29:24Z","exploits":[{"source":"pocgithub","id":"XDLDCG/bash-tls-reneg-attack","title":"XDLDCG/bash-tls-reneg-attack","date":"2019-08-28","url":"https://github.com/XDLDCG/bash-tls-reneg-attack"},{"source":"pocgithub","id":"khaledibnalwalid/CVE-2011-1473-POC","title":"khaledibnalwalid/CVE-2011-1473-POC","date":"2026-03-05","url":"https://github.com/khaledibnalwalid/CVE-2011-1473-POC"},{"source":"pocgithub","id":"zjt674449039/cve-2011-1473","title":"zjt674449039/cve-2011-1473","date":"2019-05-10","url":"https://github.com/zjt674449039/cve-2011-1473"}],"products":[{"vendor":"openssl","product":"openssl"}],"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://archives.neohapsis.com/archives/bugtraq/2014-02/0061.html","tags":["mailing-list","x_refsource_BUGTRAQ","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://marc.info/?l=bugtraq\u0026m=133951357207000\u0026w=2","tags":["vendor-advisory","x_refsource_HP","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://lists.apache.org/thread.html/142b93d261e8ac7c5ceffdce848d622404abc1c286bbc999f43a9e10%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/6121becfdd23f9aeb675d5db80616536277d5931d6cde9dca292e509%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/8be38d35654441140db8eb3f7433524b3653ac3fdc26e2fa94626a3a%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/r1e33410bb5c81536e7fe14b51fa83e7bfd9445db61fd10c134792bde%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/r298a09a2b98446b27217d719e877c643b6d13fac0bcafe04696a446b%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/r77fe575893261889b983e067293be72fa1f8c6305ede9fdbc404c514%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/r5e595b91f00613dafa635852121d45b161e8b5c3eba4551aeccc6483%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/r3822ad69442291562c2ab41132fc49780d269e8b52deb458b7060f6d%40%3Ccommits.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/r8680f41bcdad13c3f267cb868b45e5fb1f57df8b39d25193f7d66500%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/ra95c355827b3c96c8013ed8e0666c851581651be2524f3d28cd4fe71%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/r13a07a09f98b2841193dbf17a47c7f09b464e0747a1d3e7298ad4c81%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/rf9e8ae0356af3ec4f7780ca651b770721d287d4d55f62f4f754e0a6f%40%3Cdev.rocketmq.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.apache.org/thread.html/rc98eaa3f8223ac75aa5969f717954d8cbc9f3a9d8b7a615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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","status":"disputed","published":"2012-06-16T21:00:00Z","modified":"2024-08-06T22:28:41.48Z","updated_at":"2026-11-02T14:35:38.321377Z"}],"euvd":[{"id":"EUVD-2011-1478","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","status":"published","published":"2012-06-16T21:00:00Z","modified":"2024-08-06T22:28:41Z","updated_at":"2026-11-03T01:55:56.688775Z"}],"ghsa":[{"id":"GHSA-5wj2-7gqw-v6cm","title":"** DISPUTED ** OpenSSL before 0.9.8l, and 0.9.8m through 1.x, does not properly restrict client...","description":"** DISPUTED ** 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.","status":"published","published":"2022-05-13T01:10:45Z","modified":"2024-03-30T05:01:19Z","updated_at":"2026-11-02T14:55:44.111751Z"}],"nvd":[{"id":"CVE-2011-1473","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","status":"disputed","published":"2012-06-16T21:55:02.437Z","modified":"2026-06-16T23:29:24.833Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-264"],"updated_at":"2026-11-02T14:02:12.272092Z"}],"osv":[{"id":"BELL-CVE-2011-1473","title":"CVE-2011-1473 does not affect BellSoft software","status":"withdrawn","published":"2012-06-16T21:55:00Z","modified":"2026-01-28T07:21:10.540698Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium"}],"updated_at":"2026-11-02T15:28:12.886815Z"}]}}