Cyber Resilience

CVE-2026-40060

HighUpdated

Published: 13 May 2026

Published
13 May 2026
Modified
29 June 2026
KEV Added
—
Patch
—
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-2026-40060 is a high-severity Unchecked Return Value (CWE-252) vulnerability in F5 Big-Ip Application Security Manager. Its CVSS base score is 8.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 24.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A10:2025 Mishandling of Exceptional Conditions

EU & UK References

Vulnerability details

When a BIG-IP Advanced WAF or ASM security policy is configured on a virtual server, undisclosed requests can cause the bd process to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE(s)
CWE-252

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
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?

Remote crafted requests to public-facing WAF/ASM virtual server crash bd process (CWE-252), enabling application exploitation for DoS.

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

CVEs Like This One

CVE-2026-40092Shared CWE-252
CVE-2025-25724Shared CWE-252
CVE-2026-35468Shared CWE-252
CVE-2026-34065Shared CWE-252
CVE-2026-21920Shared CWE-252
CVE-2026-0723Shared CWE-252
CVE-2026-28691Shared CWE-252
CVE-2026-31830Shared CWE-252
CVE-2026-22255Shared CWE-252
CVE-2026-22047Shared CWE-252

Affected Assets

f5
big-ip application security manager
21.0.0 · 16.1.0 — 16.1.6 · 17.1.0 — 17.1.3 · 17.5.0 — 17.5.1
f5
big-ip advanced web application firewall
21.0.0 · 16.1.0 — 16.1.6 · 17.1.0 — 17.1.3 · 17.5.0 — 17.5.1

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References