Critical F5 BIG-IP APM Flaw Reclassified as RCE; Patch Now
⚠️F5 Networks has reclassified a previously patched BIG-IP APM denial-of-service flaw (CVE-2025-53521) as a critical remote code execution vulnerability after evidence of active exploitation. Attackers are deploying webshells on unpatched devices that have access policies configured on virtual servers. F5 and CISA have published advisories and IOCs and are urging immediate patching, forensic checks of disks, logs, and terminal history, and adherence to incident-handling policies.
