SARA / Free Tools / KEV / CVE-2025-53521

CVE-2025-53521 on CISA KEV

When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE).

CISA KEV — Actively Exploited

When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Ex

Vendor / Product
— / —
Added to KEV
BOD 22-01 due
Ransomware use
CVSS / EPSS
9.3 · EPSS 41.41%

01What CISA says about this vulnerability

When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE).

02Required action — verbatim from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

03Notes & references

No additional references available in the KB record.

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

No structured affected-product list available — see references below for vendor advisories.

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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