CVE-2026-40618

BIG-IP SSL/TLS vulnerability

State: Published
Severity: 8.7 High
Published: May 13, 2026
Updated: May 13, 2026
Reserved: Apr 30, 2026

Description

When an SSL profile is configured on a virtual server on BIG-IP Virtual Edition (VE) without Intel QuickAssist Technology (QAT) or on BIG-IP hardware platforms with the database variable crypto.hwacceleration set to disabled, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L	f5
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	f5

Weaknesses

CWE-131 Incorrect Calculation of Buffer Size

Affected Products

Product	Versions
BIG-IPF5	21.1.0 and laterNot affected 21.0.0 to before 21.0.0.1Affected 17.5.0 to before 17.1.5.4Affected 17.1.0 to before 17.1.3.1Affected 16.1.0 and laterAffected
BIG-IP Next SPKF5	2.0.0 and laterAffected 1.7.0 and laterAffected
BIG-IP Next CNFF5	2.0.0 and laterAffected 1.1.0 and laterAffected
BIG-IP Next for KubernetesF5	2.0.0 to before 2.2.0Affected

References

https://my.f5.com/manage/s/article/K000158082vendor-advisorypatch

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