Vulnerability Intelligence Report
BIG-IP and BIG-IQ Configuration utility vulnerability
CVE-2026-66842
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.
No Active Exploit Signals
CVSS Base Score
8.8
HIGH
Exploitability:2.9
Impact Score:5.9
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-918 ↗CWE-918 Server-Side Request Forgery (SSRF)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| F5 | BIG-IP | 21.1.0 < 21.1.0.1 (affected), 21.0.0 < 21.0.0.3 (affected), 17.5.0 < 17.5.1.8 (affected), 17.1.0 < 17.1.3.4 (affected) |
| F5 | BIG-IQ | 8.4.0 < 8.4.2.1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | F5, Inc. · Vendor · USA |
| Reserved | 2026-07-29T19:42:42 |
| Published | 2026-09-02T15:40:53 |
| Patch Date | 2026-08-19 |
| Last Updated | 2026-09-03T03:56:29 |
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