{"id":"CVE-2021-23000","aliases":["EUVD-2021-10118","GHSA-6vhg-w9jf-mcqf"],"status":"published","title":"On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is...","description":"On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00967,"percentile":0.62213,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-03-31T17:26:29Z","modified":"2026-06-17T03:38:11Z","products":[{"vendor":"f5","product":"big-ip"},{"vendor":"f5","product":"big-ip_access_policy_manager"},{"vendor":"f5","product":"big-ip_advanced_firewall_manager"},{"vendor":"f5","product":"big-ip_advanced_web_application_firewall"},{"vendor":"f5","product":"big-ip_analytics"},{"vendor":"f5","product":"big-ip_application_acceleration_manager"},{"vendor":"f5","product":"big-ip_application_security_manager"},{"vendor":"f5","product":"big-ip_ddos_hybrid_defender"},{"vendor":"f5","product":"big-ip_domain_name_system"},{"vendor":"f5","product":"big-ip_fraud_protection_service"},{"vendor":"f5","product":"big-ip_global_traffic_manager"},{"vendor":"f5","product":"big-ip_link_controller"},{"vendor":"f5","product":"big-ip_local_traffic_manager"},{"vendor":"f5","product":"big-ip_policy_enforcement_manager"},{"vendor":"f5","product":"ssl_orchestrator"}],"references":[{"url":"https://support.f5.com/csp/article/K34441555","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23000"},{"url":"https://github.com/advisories/GHSA-6vhg-w9jf-mcqf"}],"sources":{"cve":[{"id":"CVE-2021-23000","description":"On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.","status":"published","published":"2021-03-31T17:26:29Z","modified":"2024-08-03T18:58:26.021Z","updated_at":"2026-11-02T14:33:00.819444Z"}],"euvd":[{"id":"EUVD-2021-10118","description":"On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.","status":"published","published":"2021-03-31T17:26:29Z","modified":"2024-08-03T18:58:26Z","updated_at":"2026-11-03T03:25:00.591933Z"}],"ghsa":[{"id":"GHSA-6vhg-w9jf-mcqf","title":"On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is...","description":"On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.","status":"published","published":"2022-05-24T17:45:58Z","modified":"2023-01-29T05:06:11Z","updated_at":"2026-11-02T14:45:58.127346Z"}],"nvd":[{"id":"CVE-2021-23000","description":"On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.","status":"published","published":"2021-03-31T18:15:15.223Z","modified":"2026-06-17T03:38:11.137Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:51.197859Z"}]}}