F5 BIG-IP Stack-Based Buffer Overflow Vulnerability
Description
F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow a threat actor to achieve remote code execution.
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.
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Details
- Vendor
- F5
- Product
- BIG-IP APM
- CVE
- CVE-2025-53521
- Affected versions
- BIG-IP 17.5: from 17.5.0 to 17.5.1.3 (excluded) — fixed in 17.5.1.3
BIG-IP 17.1: from 17.1.0 to 17.1.3 (excluded) — fixed in 17.1.3
BIG-IP 16.1: from 16.1.0 to 16.1.6.1 (excluded) — fixed in 16.1.6.1
BIG-IP 15.1: from 15.1.0 to 15.1.10.8 (excluded) — fixed in 15.1.10.8 (from the advisory and NVD; check the exact builds in the official advisory) - CVSS score
- 9.8
- Actively exploited
- Yes, listed in the CISA Known Exploited Vulnerabilities catalog
- CISA due date
- March 30, 2026 (deadline for US federal agencies: a good benchmark for you too)
- Source
- CISA KEV – original advisory
- Published
- March 27, 2026
The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.