CVE-2025-53521 · netVigilance record NV26-0070
F5 BIG-IP Stack-Based Buffer Overflow
past due
What to do
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 deadline 2026-03-30 · passed 5 months ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
What happened
F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow a threat actor to achieve remote code execution.
Who is affected
F5 BIG-IP. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-121.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 5 months ago
Sources
- NVD entry for CVE-2025-53521 nvd.nist.gov/vuln/detail/CVE-2025-53521
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- my.f5.com my.f5.com/manage/s/article/K000156741
- my.f5.com my.f5.com/manage/s/article/K000160486
- my.f5.com my.f5.com/manage/s/article/K11438344
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2025-53521