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Actively Exploited Vulnerabilities

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CVE-2025-53521

F5 | BIG-IPAdded 2026-03-27Remediation Deadline 2026-03-30

F5 BIG-IP Stack-Based Buffer Overflow Vulnerability

F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow a threat actor to achieve remote code execution.

Required Action

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

Weakness Classification

CWE-121

References

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