CVE-2021-22991
Estado: AnalizadaCrítica (9.8)⚠ Explotación activa
On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, undisclosed requests to a virtual server may be incorrectly handled by the Traffic Management Microkernel (TMM) URI normalization, which may trigger a buffer overflow, resulting in a DoS attack. In certain situations, it may theoretically allow bypass of URL based access control or remote code execution (RCE). Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 9.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 61%
- Percentil entre todas las CVEs puntuadas: 99
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
CISA KEV — explotada activamente
- Añadida al catálogo: 18/1/2022
- Plazo de remediación: 1/2/2022
- Uso conocido en ransomware: Unknown
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access95 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 % - Impacto secundario
T1499.004Application or System Exploitationimpact85 %
Buffer overflow en TMM de F5 BIG-IP (CWE-119) accesible remotamente sin autenticación (AV:N/PR:N/UI:N). CVSS crítico permite RCE, DoS y bypass de controles. KEV confirma explotación activa.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (14)
F5 — Big-ip Access Policy ManagerF5 — Big-ip Advanced Firewall ManagerF5 — Big-ip Advanced WEB Application FirewallF5 — Big-ip AnalyticsF5 — Big-ip Application Acceleration ManagerF5 — Big-ip Application Security ManagerF5 — Big-ip Ddos Hybrid DefenderF5 — Big-ip Domain Name SystemF5 — Big-ip Fraud Protection ServiceF5 — Big-ip Global Traffic ManagerF5 — Big-ip Link ControllerF5 — Big-ip Local Traffic ManagerF5 — Big-ip Policy Enforcement ManagerF5 — SSL Orchestrator
CWE
- CWE-119
- CWE-119
Referencias
JSON original (NVD)
Mostrar
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