BIG-IP Configuration utility vulnerability

Answer in brief

CVE-2026-63020 records a Unknown severity vulnerability in BIG-IP Configuration utility vulnerability. The current sources do not mark it as known exploited. The current feed maps F5/BIG-IP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 2, 2026Updated Sep 2, 2026Source checked Sep 2, 2026First seen by HOL Sep 2, 2026Material review Sep 2, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps F5/BIG-IP (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
F5/BIG-IPgeneric	>=21.1.0 <21.1.0.1 \|\| >=21.0.0 <21.0.0.3 \|\| >=17.5.0 <17.5.1.8 \|\| >=17.1.0 <17.1.3.4	21.1.0.1, 21.0.0.3, 17.5.1.8, 17.1.3.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for F5/BIG-IP.
Review the reported fix. Update F5/BIG-IP to 21.1.0.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 2, 2026

Sources and claim methodology

Source referencemy.f5.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.