UK NCSC and CISA Urge Immediate Patching of Critical F5 BIG-IP RCE Flaw Under Active Exploitation
The UK National Cyber Security Centre and CISA are urging organizations to urgently patch CVE-2025-53521, a critical remote code execution vulnerability in F5 BIG-IP Access Policy Manager that was reclassified from a denial-of-service flaw and is now under active exploitation.