CVE-2026-42781

BIG-IP FastL4 virtual server vulnerability

State: Published
Severity: 7.1 High
Published: May 13, 2026
Updated: May 13, 2026
Reserved: Apr 30, 2026

Description

When embedded Packet Velocity Acceleration (ePVA) acceleration is configured, undisclosed local ethernet traffic can cause an increase in ePVA and Traffic Management Microkernel (TMM) resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	f5
3.1	6.5 Medium	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	f5

Weaknesses

CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

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 17.5.1.4Affected 17.1.0 to before 17.1.3.1Affected 16.1.0 and laterNot affected

References

https://my.f5.com/manage/s/article/K000160862vendor-advisorypatch

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