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F5 BIG-IP DNS CVE-2026-40061

| EUVD-2026-29970 HIGH
Command Injection (CWE-77)
2026-05-13 f5 GHSA-rpj4-762v-f8r2
8.5
CVSS 4.0
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CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

5
Re-analysis Queued
May 13, 2026 - 16:22 vuln.today
cvss_changed
Severity Changed
May 13, 2026 - 16:22 NVD
MEDIUM HIGH
CVSS changed
May 13, 2026 - 16:22 NVD
6.5 (MEDIUM) 8.5 (HIGH)
Analysis Generated
May 13, 2026 - 15:57 vuln.today
CVE Published
May 13, 2026 - 14:12 nvd
MEDIUM 6.5

DescriptionNVD

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.

AnalysisAI

Authenticated attackers with Resource Administrator or Administrator role can execute arbitrary system commands via undisclosed iControl REST or BIG-IP TMOS Shell (tmsh) commands, potentially escalating privileges and crossing security boundaries in Appliance mode deployments. CVSS 6.5 reflects high privileges required (PR:H) but high confidentiality and integrity impact. …

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CVE-2026-40061 vulnerability details – vuln.today

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