CVE-2026-39459 PUBLISHED

iControl REST and tmsh vulnerability

Assigner: f5
Reserved: 30.04.2026 Published: 13.05.2026 Updated: 14.05.2026

A vulnerability exists in iControl REST and the TMOS Shell (tmsh) where a highly privileged, authenticated attacker with at least the Manager role can create configuration objects that allow running arbitrary commands.

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

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 7.2

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	High	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	F5
Product	BIG-IP
Versions	Default: unknown unaffected from 21.1.0 to * (excl.) affected from 21.0.0 to 21.0.0.2 (excl.) affected from 17.5.0 to 17.5.1.6 (excl.) affected from 17.1.0 to 17.1.3.2 (excl.) affected from 16.1.0 to * (excl.)

Credits

F5 acknowledges Adam Logue for bringing this issue to our attention and following the highest standards of coordinated disclosure. reporter

References

https://my.f5.com/manage/s/article/K000160863

Problem Types

CWE-272 Least Privilege Violation CWE