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CRITICAL SEVERITY
CVE-2025-53521F5 · BIG-IP

F5 BIG-IP Unspecified Vulnerability

Technical Severity

CVSS v3.1 Metrics

CRITICAL
9.8 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Likelihood

EPSS Prediction

19.92 %
Predictive Probability
Percentile Rank
95.4 th

Documented as more likely to be exploited than 95.4% of known CVEs.

Detection Date

Mar 27, 2026

Remediation Due

Mar 30, 2026

CISA Catalog Active

Threat Analysis

F5 BIG-IP APM contains an unspecified vulnerability that could allow a threat actor to achieve remote code execution.

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

Please adhere to F5’s guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible F5 products affected by this vulnerability. For more information please see:

https://my.f5.com/manage/s/article/K000156741

https://my.f5.com/manage/s/article/K000160486

https://my.f5.com/manage/s/article/K000160486

https://my.f5.com/manage/s/article/K11438344

https://my.f5.com/manage/s/article/K11438344

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2025-53521