CVE-2026-63020: CWE-451: User Interface (UI) Misrepresentation of Critical Information in F5 BIG-IP
Description
A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof error messages Impact: An attacker may trick authenticated BIG-IP users into accessing malicious links and reflect a spoofed error message in the victim's BIG-IP Configuration utility web browser session. This is a control plane issue; there is no data plane exposure. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS v3.1
Score 3.1low
Affected software
F5
BIG-IP
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in F5 BIG-IP's configuration utility allows an attacker to spoof error messages within the user interface. The flaw can be exploited by an attacker to deceive authenticated users into interacting with malicious links reflected as spoofed error messages in their web browser session. The issue affects the control plane only and does not expose the data plane. The affected versions explicitly include 17.1.0, 17.5.0, 21.0.0, and 21.1.0. No vendor advisory or patch information is provided, and the remediation level is unknown.
Potential Impact
The vulnerability may allow an attacker to mislead authenticated BIG-IP users by displaying spoofed error messages, potentially causing users to access malicious links. There is no confidentiality, availability, or data plane impact. The overall impact is limited to user interface deception with low severity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution when interacting with error messages in the BIG-IP configuration utility and verify the authenticity of links before clicking.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- f5
- Date Reserved
- 2026-07-24T22:40:21.245Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a984660acd9273b496cc37a
Added to database: 09/02/2026, 15:53:04 UTC
Last enriched: 09/07/2026, 13:34:18 UTC
Last updated: 10/18/2026, 18:48:22 UTC
Views: 118
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