CVE-2025-53521BigIP APM Vulnerability
Updated under an hour ago ()
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It affects F5 BIG-IP and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 27, 2026; federal agencies had to remediate by Mar 30, 2026. Treat that date as your deadline.
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Free account, 1 product
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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-121
- Known exploited
- Added to CISA KEV Mar 27, 2026; federal remediation due Mar 30, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 2.30% (percentile 83)
- Assigned by
- f5
- NVD analysis
- Analyzed
- Record last updated
- Mar 31, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
F5 BIG-IP f5:big_ip (from the name) | from 17.5.0 before 17.5.1.3; from 17.1.0 before 17.1.3; from 16.1.0 before 16.1.6.1; from 15.1.0 before 15.1.10.8 | CNA record |
f5 big-ip_access_policy_manager f5:big-ip_access_policy_manager | from 15.1.0 before 15.1.10.8; from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; from 17.5.0 before 17.5.1.3 | NVD |
References
- https://my.f5.com/manage/s/article/K000156741vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53521us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.