BIG-IP
CVE-2026-66842: BIG-IP and BIG-IQ Configuration utility vulnerability
BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts through an undisclosed request to Traffic Management User Interface (TMUI).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| BIG-IP 21.1 | 21.1.0.1 or later |
| BIG-IP 21.0 | 21.0.0.3 or later |
| BIG-IP 17.5 | 17.5.1.8 or later |
| BIG-IP 17.1 | 17.1.3.4 or later |
| BIG-IQ 8.4 | 8.4.2.1 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts through an undisclosed request to Traffic Management User Interface (TMUI).
Impact:
This vulnerability may allow an authenticated attacker with network access to the BIG-IP management interface to escalate privileges by creating administrative accounts on the BIG-IP system. There is no data plane exposure; this is a control plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Workarounds
None
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 12 Oct 2026.