CVE-2025-53521 — F5 BIG-IP: F5 BIG-IP Stack-Based Buffer Overflow Vulnerability
CVE-2025-53521 — F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow a threat actor to achieve remote code execution.
What This Means For You
- CISA has confirmed active exploitation — immediate patching required.
- Added to CISA KEV catalog — federal agencies must remediate by 2026-03-30.
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2025-53521 | Buffer Overflow | F5 BIG-IP APM, stack-based buffer overflow vulnerability, potential for RCE |
| CVE-2025-53521 | RCE | F5 BIG-IP APM, stack-based buffer overflow vulnerability allowing remote code execution |
Source & Attribution
| Source Platform | CISA |
| Channel | CISA KEV |
| Published | March 27, 2026 at 15:00 UTC |
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