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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.

PUBLISHED Reserved 2026-04-30 | Published 2026-05-13 | Updated 2026-05-14 | Assigner f5




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Standard Deployment

HIGH: 8.7CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Appliance Mode

HIGH: 8.5CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Standard Deployment and Appliance Mode

Problem types

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

Product status

Default status
unknown

21.1.0 (custom) before *
unaffected

21.0.0 (custom) before 21.0.0.1
affected

17.5.0 (custom) before 17.5.1.4
affected

17.1.0 (custom) before 17.1.3.1
affected

16.1.0 (custom) before *
affected

Credits

F5 finder

References

my.f5.com/manage/s/article/K000160788 vendor-advisory patch

cve.org (CVE-2026-40061)

nvd.nist.gov (CVE-2026-40061)

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