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9.3
CVSS
Critical

CVE-2025-53521

PUBLISHED

BigIP APM Vulnerability

1 day faster than CISA KEV

Exploited in the wild Remote Low complexity No user interaction
Vendor
F5
Product
BIG-IP
Published
Oct 15, 2025
EPSS
8.8% · 93% pctl

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Description

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.

cisa edge

Weaknesses (CWE)

  • CWE-121

    Stack-based Buffer Overflow

CVSS scores

CVSS v4.0 9.3 Critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS v3.1 9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation status

Exploited in the wild

Recorded 2026-06-01 12:26:16 UTC · CVE

References

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source Added
CVE First 2026-06-01 12:26 UTC
CISA 2026-06-02 14:02 UTC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel

  • KEV confirmed by CISA