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CVE-2026-63020— BIG-IP Configuration utility vulnerability

Quick assessment

Affected
F5 BIG-IP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

F5 BIG-IP是美国F5公司的一款应用交付控制器。 F5 BIG-IP 21.1.0.1之前版本、21.0.0.3之前版本、17.5.1.8之前版本和17.1.3.4之前版本存在处理逻辑错误漏洞，该漏洞源于BIG-IP配置实用程序页面存在错误消息伪造问题，可能导致攻击者诱骗已认证用户访问恶意链接，并在受害者的BIG-IP配置实用程序浏览器会话中反射伪造的错误消息。

CVSS 3.1 · Low EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1567 · Exfiltration Over Web Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
F5 BIG-IP 21.1.0< 21.1.0.1 affected
21.0.0< 21.0.0.3 affected
17.5.0< 17.5.1.8 affected
17.1.0< 17.1.3.4 affected
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I. Basic Information for CVE-2026-63020

Vulnerability Information
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Vulnerability Title
BIG-IP Configuration utility vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键信息的UI错误表达
Source: CVE Program / CVE List V5
Vulnerability Title
F5 BIG-IP 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 BIG-IP是美国F5公司的一款应用交付控制器。 F5 BIG-IP 21.1.0.1之前版本、21.0.0.3之前版本、17.5.1.8之前版本和17.1.3.4之前版本存在处理逻辑错误漏洞，该漏洞源于BIG-IP配置实用程序页面存在错误消息伪造问题，可能导致攻击者诱骗已认证用户访问恶意链接，并在受害者的BIG-IP配置实用程序浏览器会话中反射伪造的错误消息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 BIG-IP 21.1.0 ~ 21.1.0.1 -

II. Public POCs for CVE-2026-63020

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III. Intelligence Information for CVE-2026-63020

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Vendor Advisories for CVE-2026-63020 (1)

Same Patch Batch · F5 · 2026-09-02 · 7 CVEs total

CVE-2026-66842 8.8 HIGH BIG-IP and BIG-IQ Configuration utility vulnerability
CVE-2026-77180 8.3 HIGH NGINX Ingress Controller vulnerability
CVE-2026-18329 8.2 HIGH NGINX ngx_http_js_module vulnerability
CVE-2026-78689 8.1 HIGH NGINX ngx_http_js_module vulnerablility
CVE-2026-66362 8.1 HIGH NGF vulnerability
CVE-2026-78222 7.5 HIGH NGINX ngx_http_js_module vulnerability

IV. Related Vulnerabilities

Same product: BIG-IP
Same vendor: F5
Same weakness: CWE-451

V. Comments for CVE-2026-63020

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