CVE-2026-40067

HighUpdated

Published: 13 May 2026

Published

13 May 2026

Modified

29 June 2026

KEV Added

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Patch

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CVSS Score v4 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0032 24.3th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-40067 is a high-severity Classic Buffer Overflow (CWE-120) vulnerability in F5 Big-Ip Access Policy Manager. Its CVSS base score is 8.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 24.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-29971

Vulnerability details

When a BIG-IP APM access policy is configured on a virtual server, undisclosed traffic can cause the apmd process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE(s): CWE-120

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.004 Application or System Exploitation Impact

Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.

attack.mitre.org →

Why these techniques?

Buffer overflow (CWE-120) in public-facing APM service enables remote process termination via crafted traffic, directly mapping to application exploitation for endpoint DoS.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0