CVE-2025-53521

high-risk
Published 2025-10-15

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.

Do I need to act?

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41.4% chance of exploitation in next 30 days
EPSS score — higher than 59% of all CVEs
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CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

F5

References (2)

Vendor Advisory https://my.f5.com/manage/s/article/K000156741
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-...
61
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 24/34 · High
Exposure 5/34 · Minimal