Threat Intelligence / CVE / CVE-2025-53521
CVE-2025-53521
CISA KEVWhen a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE). Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
CWE-121, CWE-770
Threats tracking this CVE
- CVE-2025-53521: F5 BIG-IP APM Unauthenticated Remote Code Execution via apmd Process — Active Exploitation by UNC5221 (BRICKSTORM) — CRITICAL
- CVE-2025-53521: F5 BIG-IP APM Unauthenticated Remote Code Execution via Stack-based Buffer Overflow — CRITICAL
- F5 BIG-IP APM Unauthenticated Remote Code Execution via Stack Buffer Overflow (CVE-2025-53521) — CISA KEV Active Exploitation by Chinese Nation-State Actor — CRITICAL
References
- https://my.f5.com/manage/s/article/K000156741
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53521
Full detection coverage & IOCs for threats exploiting CVE-2025-53521 are available via the Threadlinqs MCP server (Purple tier). View plans →