CVE-2025-53521 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 2.3% (pctl 83)
Patch first
On CISA KEV — known exploited in the wild, due 2026-03-30.
Description
When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE). Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.3% — more likely to be exploited than 83% of all CVEs |
| Weakness | CWE-121 |
| On CISA KEV | yes — remediate by 2026-03-30 |
| Public exploit | none known |
| Published | 2025-10-15 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | F5 BIG-IP Stack-Based Buffer Overflow Vulnerability |
|---|---|
| Added | 2026-03-27 |
| Due | 2026-03-30 |
| Vendor / product | F5 / BIG-IP |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| f5 | big-ip access policy manager |
References
→ the Explorer · watch your stack · NVD