Vulnerability · Published May 13, 2026 · Assigned by f5

CVE-2026-40462iControl REST and tmsh vulnerability

Medium 6.5

In plain English

A medium-severity incorrect permission assignment in BIG-IP from F5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 83.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Incorrect permission assignment vulnerabilities exist in iControl REST and TMOS shell (tmsh) undisclosed command which may allow an authenticated attacker to view sensitive information. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products (as reported)

Vendor	Product	Versions
F5	BIG-IP	21.0.0 – before 21.0.0.117.5.0 – before 17.5.1.417.1.0 – before 17.1.3.116.1.0 – before *

Weakness: CWE-732 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://my.f5.com/manage/s/article/K000156581 vendor-advisory, patch