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CVE-2026-66842— BIG-IP and BIG-IQ 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至21.1.0.1之前版本、21.0.0至21.0.0.3之前版本、17.5.0至17.5.1.8之前版本和17.1.0至17.1.3.4之前版本存在服务端请求伪造漏洞，该漏洞源于经过身份验证的任意角色用户可通过向流量管理用户界面（TMUI）发送未公开请求来创建管理用户账户，可能导致权限提升。

CVSS 8.8 · High EPSS 0.47% · P39

Affected Version Matrix 5

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
F5 BIG-IQ 8.4.0< 8.4.2.1 affected
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I. Basic Information for CVE-2026-66842

Vulnerability Information
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Vulnerability Title
BIG-IP and BIG-IQ Configuration utility vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
F5 BIG-IP 服务端请求伪造漏洞
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至21.1.0.1之前版本、21.0.0至21.0.0.3之前版本、17.5.0至17.5.1.8之前版本和17.1.0至17.1.3.4之前版本存在服务端请求伪造漏洞，该漏洞源于经过身份验证的任意角色用户可通过向流量管理用户界面（TMUI）发送未公开请求来创建管理用户账户，可能导致权限提升。
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 -
F5 BIG-IQ 8.4.0 ~ 8.4.2.1 -

II. Public POCs for CVE-2026-66842

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III. Intelligence Information for CVE-2026-66842

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Vendor Pages for CVE-2026-66842 (1)

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

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
CVE-2026-63020 3.1 LOW BIG-IP Configuration utility vulnerability

IV. Related Vulnerabilities

Same product: BIG-IP
Same vendor: F5
Same weakness: CWE-918

V. Comments for CVE-2026-66842

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