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CVE-2026-66842

BIG-IP and BIG-IQ Configuration utility vulnerability

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 21.1.0.1, 21.0.0.3, 17.5.1.8, 17.1.3.4, 8.4.2.1
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  2. CVE published
  3. Record last updated

Affected versions

  • F5 BIG-IP

    From 21.1.0 · fixed in 21.1.0.1; From 21.0.0 · fixed in 21.0.0.3; From 17.5.0 · fixed in 17.5.1.8; From 17.1.0 · fixed in 17.1.3.4

  • F5 BIG-IQ

    From 8.4.0 · fixed in 8.4.2.1

References 1

my.f5.com