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CVE-2026-66842

BIG-IP and BIG-IQ Configuration utility vulnerability

HIGH
8.8
CVSS Score
Published: September 2, 2026 at 03:40 PM UTC
Updated: September 3, 2026 at 01:06 PM UTC
2 products affected across 1 vendorBIG-IPBIG-IQ Centralized Management

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Severity
HIGH8.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

BIG-IP· F5
60%
17.1.0 ≤ v < 17.1.3.417.5.0 ≤ v < 17.5.1.821.0.0 ≤ v < 21.0.0.321.1.0 ≤ v < 21.1.0.117.1.017.5.021.0.021.1.0
Affected range stops below 17.1.3.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 17.5.1.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 21.0.0.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 21.1.0.1, so it looks safe — our inference, not a vendor statement
BIG-IQ Centralized Management· F5
60%
8.4.0 ≤ v < 8.4.2.18.4.0
Affected range stops below 8.4.2.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://my.f5.com/manage/s/article/K000162521

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHf5
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusUNDERGOING ANALYSIS
CWE
CWE-918

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