CVE-2026-40061

iControl REST and tmsh vulnerability

State: Published
Severity: 8.5 High
Published: May 13, 2026
Updated: May 14, 2026
Reserved: Apr 30, 2026

Description

When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed iControl REST and BIG-IP TMOS Shell (tmsh) command that may allow an authenticated attacker with the Resource Administrator or Administrator role to execute arbitrary system commands with higher privileges. In Appliance mode deployments, a successful exploit can 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	8.5 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	f5
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N	f5
3.1	8.7 High	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N	f5

Weaknesses

CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')

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/K000160788vendor-advisorypatch

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