CVE-2025-53521
F5 BIG-IP Stack-Based Buffer Overflow Vulnerability
CVSS
—
No CVSS
EPSS
2.2%
p81
KEV
YES
Mar 27, 2026
Exploit Today
74
0-100
Published: — · Last modified: —
Product
F5 / BIG-IP
Vulnerability
F5 BIG-IP Stack-Based Buffer Overflow Vulnerability
Added to KEV
Mar 27, 2026
Remediate by
Mar 30, 2026
Known ransomware use
No
Summary description
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.
Notes
Please adhere to F5’s guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible F5 products affected by this vulnerability. For more information please see: https://my.f5.com/manage/s/article/K000156741 ; https://my.f5.com/manage/s/article/K000160486 ; https://my.f5.com/manage/s/article/K11438344 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53521