Oct 19, 2026 · 14:11 UTC SEARCH
UNRATED KNOWN EXPLOITED
Vulnerability intelligence

CVE-2025-53521

VendorF5
ProductBIG-IP
Known exploitedYes
Added to CISA KEVMarch 27, 2026
KEV due dateMarch 30, 2026
Known ransomware useNot identified by CISA

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.

CISA KEV status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities Catalog. Known ransomware campaign use: Unknown.

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