CVE-2026-42919

F5 BIG-IP Appliance Mode Vulnerability

State: Published
Severity: 7.1 High
Published: May 13, 2026
Updated: May 14, 2026
Reserved: Apr 30, 2026

Description

A vulnerability exists in BIG-IP systems that may allow an authenticated attacker with administrative access to escalate their privileges. A successful exploit may allow the attacker to cross a security boundary.

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:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N	f5
3.1	6.7 Medium	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H	f5

Weaknesses

CWE-121 Stack-based Buffer Overflow

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 laterAffected

References

https://my.f5.com/manage/s/article/K000158971vendor-advisorypatch

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