CVE-2025-53521
Stack-Based Buffer Overflow in F5 BIG-IP. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 27 March 2026.
- Product
- F5 BIG-IP
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow a threat actor to achieve remote code execution.
More from F5 this year.
- CVE-2026-94127 Heap-based Buffer Overflow, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.