---
id: CVE-2026-63020
title: "A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof error messages\_\n\n\n\n\n\nImpact:\n\n\nAn attacker may trick authenticated BIG-IP users \ninto accessing malicious links and reflect a …"
summary: "A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof error messages\_\n\n\n\n\n\nImpact:\n\n\nAn attacker may trick authenticated BIG-IP users \ninto accessing malicious links and reflect a …"
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-451
vendor: f5
product: big-ip_access_policy_manager
affected:
  - 'big-ip_access_policy_manager >= 17.1.0, <= 17.1.3'
  - 'big-ip_access_policy_manager >= 17.5.0, <= 17.5.1'
  - 'big-ip_advanced_firewall_manager >= 17.1.0, <= 17.1.3'
  - 'big-ip_advanced_firewall_manager >= 17.5.0, <= 17.5.1'
  - 'big-ip_advanced_web_application_firewall >= 17.1.0, <= 17.1.3'
  - 'big-ip_advanced_web_application_firewall >= 17.5.0, <= 17.5.1'
  - 'big-ip_analytics >= 17.1.0, <= 17.1.3'
  - 'big-ip_analytics >= 17.5.0, <= 17.5.1'
  - 'big-ip_application_acceleration_manager >= 17.1.0, <= 17.1.3'
  - 'big-ip_application_acceleration_manager >= 17.5.0, <= 17.5.1'
  - 'big-ip_application_security_manager >= 17.1.0, <= 17.1.3'
  - 'big-ip_application_security_manager >= 17.5.0, <= 17.5.1'
  - 'big-ip_application_visibility_and_reporting >= 17.1.0, <= 17.1.3'
  - 'big-ip_application_visibility_and_reporting >= 17.5.0, <= 17.5.1'
  - 'big-ip_automation_toolchain >= 17.1.0, <= 17.1.3'
  - 'big-ip_automation_toolchain >= 17.5.0, <= 17.5.1'
  - 'big-ip_carrier-grade_nat >= 17.1.0, <= 17.1.3'
  - 'big-ip_carrier-grade_nat >= 17.5.0, <= 17.5.1'
  - 'big-ip_container_ingress_services >= 17.1.0, <= 17.1.3'
  - 'big-ip_container_ingress_services >= 17.5.0, <= 17.5.1'
  - 'big-ip_ddos_hybrid_defender >= 17.1.0, <= 17.1.3'
  - 'big-ip_ddos_hybrid_defender >= 17.5.0, <= 17.5.1'
  - 'big-ip_domain_name_system >= 17.1.0, <= 17.1.3'
  - 'big-ip_domain_name_system >= 17.5.0, <= 17.5.1'
  - 'big-ip_edge_gateway >= 17.1.0, <= 17.1.3'
  - 'big-ip_edge_gateway >= 17.5.0, <= 17.5.1'
  - 'big-ip_fraud_protection_service >= 17.1.0, <= 17.1.3'
  - 'big-ip_fraud_protection_service >= 17.5.0, <= 17.5.1'
  - 'big-ip_global_traffic_manager >= 17.1.0, <= 17.1.3'
  - 'big-ip_global_traffic_manager >= 17.5.0, <= 17.5.1'
  - 'big-ip_link_controller >= 17.1.0, <= 17.1.3'
  - 'big-ip_link_controller >= 17.5.0, <= 17.5.1'
  - 'big-ip_local_traffic_manager >= 17.1.0, <= 17.1.3'
  - 'big-ip_local_traffic_manager >= 17.5.0, <= 17.5.1'
  - 'big-ip_policy_enforcement_manager >= 17.1.0, <= 17.1.3'
  - 'big-ip_policy_enforcement_manager >= 17.5.0, <= 17.5.1'
  - 'big-ip_ssl_orchestrator >= 17.1.0, <= 17.1.3'
  - 'big-ip_ssl_orchestrator >= 17.5.0, <= 17.5.1'
  - 'big-ip_webaccelerator >= 17.1.0, <= 17.1.3'
  - 'big-ip_webaccelerator >= 17.5.0, <= 17.5.1'
  - 'big-ip_websafe >= 17.1.0, <= 17.1.3'
  - 'big-ip_websafe >= 17.5.0, <= 17.5.1'
  - 'big-ip_access_policy_manager >= 21.0.0, <= 21.1.0'
  - 'big-ip_advanced_firewall_manager >= 21.0.0, <= 21.1.0'
  - 'big-ip_advanced_web_application_firewall >= 21.0.0, <= 21.1.0'
  - 'big-ip_analytics >= 21.0.0, <= 21.1.0'
  - 'big-ip_application_acceleration_manager >= 21.0.0, <= 21.1.0'
  - 'big-ip_application_security_manager >= 21.0.0, <= 21.1.0'
  - 'big-ip_application_visibility_and_reporting >= 21.0.0, <= 21.1.0'
  - 'big-ip_automation_toolchain >= 21.0.0, <= 21.1.0'
  - 'big-ip_carrier-grade_nat >= 21.0.0, <= 21.1.0'
  - 'big-ip_container_ingress_services >= 21.0.0, <= 21.1.0'
  - 'big-ip_ddos_hybrid_defender >= 21.0.0, <= 21.1.0'
  - 'big-ip_domain_name_system >= 21.0.0, <= 21.1.0'
  - 'big-ip_edge_gateway >= 21.0.0, <= 21.1.0'
  - 'big-ip_fraud_protection_service >= 21.0.0, <= 21.1.0'
  - 'big-ip_global_traffic_manager >= 21.0.0, <= 21.1.0'
  - 'big-ip_link_controller >= 21.0.0, <= 21.1.0'
  - 'big-ip_local_traffic_manager >= 21.0.0, <= 21.1.0'
  - 'big-ip_policy_enforcement_manager >= 21.0.0, <= 21.1.0'
  - 'big-ip_ssl_orchestrator >= 21.0.0, <= 21.1.0'
  - 'big-ip_webaccelerator >= 21.0.0, <= 21.1.0'
  - 'big-ip_websafe >= 21.0.0, <= 21.1.0'
published: '2026-09-02'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T18:19:18.243'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63020'
references:
  - url: 'https://my.f5.com/manage/s/article/K000161728'
    label: f5sirt@f5.com
tags:
  - nvd
epss: 0.0023
epssPercentile: 0.12343
ingestedAt: '2026-09-15T18:41:59.123Z'
---

## Overview

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.

## Affected

- `big-ip_access_policy_manager >= 17.1.0, <= 17.1.3`
- `big-ip_access_policy_manager >= 17.5.0, <= 17.5.1`
- `big-ip_advanced_firewall_manager >= 17.1.0, <= 17.1.3`
- `big-ip_advanced_firewall_manager >= 17.5.0, <= 17.5.1`
- `big-ip_advanced_web_application_firewall >= 17.1.0, <= 17.1.3`
- `big-ip_advanced_web_application_firewall >= 17.5.0, <= 17.5.1`
- `big-ip_analytics >= 17.1.0, <= 17.1.3`
- `big-ip_analytics >= 17.5.0, <= 17.5.1`
- `big-ip_application_acceleration_manager >= 17.1.0, <= 17.1.3`
- `big-ip_application_acceleration_manager >= 17.5.0, <= 17.5.1`
- `big-ip_application_security_manager >= 17.1.0, <= 17.1.3`
- `big-ip_application_security_manager >= 17.5.0, <= 17.5.1`
- `big-ip_application_visibility_and_reporting >= 17.1.0, <= 17.1.3`
- `big-ip_application_visibility_and_reporting >= 17.5.0, <= 17.5.1`
- `big-ip_automation_toolchain >= 17.1.0, <= 17.1.3`
- `big-ip_automation_toolchain >= 17.5.0, <= 17.5.1`
- `big-ip_carrier-grade_nat >= 17.1.0, <= 17.1.3`
- `big-ip_carrier-grade_nat >= 17.5.0, <= 17.5.1`
- `big-ip_container_ingress_services >= 17.1.0, <= 17.1.3`
- `big-ip_container_ingress_services >= 17.5.0, <= 17.5.1`
- `big-ip_ddos_hybrid_defender >= 17.1.0, <= 17.1.3`
- `big-ip_ddos_hybrid_defender >= 17.5.0, <= 17.5.1`
- `big-ip_domain_name_system >= 17.1.0, <= 17.1.3`
- `big-ip_domain_name_system >= 17.5.0, <= 17.5.1`
- `big-ip_edge_gateway >= 17.1.0, <= 17.1.3`
- `big-ip_edge_gateway >= 17.5.0, <= 17.5.1`
- `big-ip_fraud_protection_service >= 17.1.0, <= 17.1.3`
- `big-ip_fraud_protection_service >= 17.5.0, <= 17.5.1`
- `big-ip_global_traffic_manager >= 17.1.0, <= 17.1.3`
- `big-ip_global_traffic_manager >= 17.5.0, <= 17.5.1`
- `big-ip_link_controller >= 17.1.0, <= 17.1.3`
- `big-ip_link_controller >= 17.5.0, <= 17.5.1`
- `big-ip_local_traffic_manager >= 17.1.0, <= 17.1.3`
- `big-ip_local_traffic_manager >= 17.5.0, <= 17.5.1`
- `big-ip_policy_enforcement_manager >= 17.1.0, <= 17.1.3`
- `big-ip_policy_enforcement_manager >= 17.5.0, <= 17.5.1`
- `big-ip_ssl_orchestrator >= 17.1.0, <= 17.1.3`
- `big-ip_ssl_orchestrator >= 17.5.0, <= 17.5.1`
- `big-ip_webaccelerator >= 17.1.0, <= 17.1.3`
- `big-ip_webaccelerator >= 17.5.0, <= 17.5.1`
- `big-ip_websafe >= 17.1.0, <= 17.1.3`
- `big-ip_websafe >= 17.5.0, <= 17.5.1`
- `big-ip_access_policy_manager >= 21.0.0, <= 21.1.0`
- `big-ip_advanced_firewall_manager >= 21.0.0, <= 21.1.0`
- `big-ip_advanced_web_application_firewall >= 21.0.0, <= 21.1.0`
- `big-ip_analytics >= 21.0.0, <= 21.1.0`
- `big-ip_application_acceleration_manager >= 21.0.0, <= 21.1.0`
- `big-ip_application_security_manager >= 21.0.0, <= 21.1.0`
- `big-ip_application_visibility_and_reporting >= 21.0.0, <= 21.1.0`
- `big-ip_automation_toolchain >= 21.0.0, <= 21.1.0`
- `big-ip_carrier-grade_nat >= 21.0.0, <= 21.1.0`
- `big-ip_container_ingress_services >= 21.0.0, <= 21.1.0`
- `big-ip_ddos_hybrid_defender >= 21.0.0, <= 21.1.0`
- `big-ip_domain_name_system >= 21.0.0, <= 21.1.0`
- `big-ip_edge_gateway >= 21.0.0, <= 21.1.0`
- `big-ip_fraud_protection_service >= 21.0.0, <= 21.1.0`
- `big-ip_global_traffic_manager >= 21.0.0, <= 21.1.0`
- `big-ip_link_controller >= 21.0.0, <= 21.1.0`
- `big-ip_local_traffic_manager >= 21.0.0, <= 21.1.0`
- `big-ip_policy_enforcement_manager >= 21.0.0, <= 21.1.0`
- `big-ip_ssl_orchestrator >= 21.0.0, <= 21.1.0`
- `big-ip_webaccelerator >= 21.0.0, <= 21.1.0`
- `big-ip_websafe >= 21.0.0, <= 21.1.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.