CVE-2025-53521: F5 BIG-IP Stack-Based Buffer Overflow Vulnerability

Added to the CISA Known Exploited Vulnerabilities catalog on 27 Mar 2026. Vendor: F5. Product: BIG-IP.

F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow a threat actor to achieve remote code execution.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. (due 30 Mar 2026)