BIG-IP Configuration utility vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63020
StatePUBLISHED
Assignerf5
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-02 16:17:18 UTC
Updated2026-09-15 18:19:18 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 2.3 LOW from [email protected]

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.001860000 probability, percentile 0.083930000 (date 2026-09-15)

Problem Types: CWE-451 | CWE-451 CWE-451: User Interface (UI) Misrepresentation of Critical Information

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2.3LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS2.3LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
3.1[email protected]Secondary3.1LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
3.1CNACVSS3.1LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application F5 Big-ip Access Policy Manager All All All All
Application F5 Big-ip Access Policy Manager All All All All
Application F5 Big-ip Access Policy Manager All All All All
Application F5 Big-ip Advanced Firewall Manager All All All All
Application F5 Big-ip Advanced Firewall Manager All All All All
Application F5 Big-ip Advanced Firewall Manager All All All All
Application F5 Big-ip Advanced Web Application Firewall All All All All
Application F5 Big-ip Advanced Web Application Firewall All All All All
Application F5 Big-ip Advanced Web Application Firewall All All All All
Application F5 Big-ip Analytics All All All All
Application F5 Big-ip Analytics All All All All
Application F5 Big-ip Analytics All All All All
Application F5 Big-ip Application Acceleration Manager All All All All
Application F5 Big-ip Application Acceleration Manager All All All All
Application F5 Big-ip Application Acceleration Manager All All All All
Application F5 Big-ip Application Security Manager All All All All
Application F5 Big-ip Application Security Manager All All All All
Application F5 Big-ip Application Security Manager All All All All
Application F5 Big-ip Application Visibility And Reporting All All All All
Application F5 Big-ip Application Visibility And Reporting All All All All
Application F5 Big-ip Application Visibility And Reporting All All All All
Application F5 Big-ip Automation Toolchain All All All All
Application F5 Big-ip Automation Toolchain All All All All
Application F5 Big-ip Automation Toolchain All All All All
Application F5 Big-ip Carrier-grade Nat All All All All
Application F5 Big-ip Carrier-grade Nat All All All All
Application F5 Big-ip Carrier-grade Nat All All All All
Application F5 Big-ip Container Ingress Services All All All All
Application F5 Big-ip Container Ingress Services All All All All
Application F5 Big-ip Container Ingress Services All All All All
Application F5 Big-ip Ddos Hybrid Defender All All All All
Application F5 Big-ip Ddos Hybrid Defender All All All All
Application F5 Big-ip Ddos Hybrid Defender All All All All
Application F5 Big-ip Domain Name System All All All All
Application F5 Big-ip Domain Name System All All All All
Application F5 Big-ip Domain Name System All All All All
Application F5 Big-ip Edge Gateway All All All All
Application F5 Big-ip Edge Gateway All All All All
Application F5 Big-ip Edge Gateway All All All All
Application F5 Big-ip Fraud Protection Service All All All All
Application F5 Big-ip Fraud Protection Service All All All All
Application F5 Big-ip Fraud Protection Service All All All All
Application F5 Big-ip Global Traffic Manager All All All All
Application F5 Big-ip Global Traffic Manager All All All All
Application F5 Big-ip Global Traffic Manager All All All All
Application F5 Big-ip Link Controller All All All All
Application F5 Big-ip Link Controller All All All All
Application F5 Big-ip Link Controller All All All All
Application F5 Big-ip Local Traffic Manager All All All All
Application F5 Big-ip Local Traffic Manager All All All All
Application F5 Big-ip Local Traffic Manager All All All All
Application F5 Big-ip Policy Enforcement Manager All All All All
Application F5 Big-ip Policy Enforcement Manager All All All All
Application F5 Big-ip Policy Enforcement Manager All All All All
Application F5 Big-ip Ssl Orchestrator All All All All
Application F5 Big-ip Ssl Orchestrator All All All All
Application F5 Big-ip Ssl Orchestrator All All All All
Application F5 Big-ip Webaccelerator All All All All
Application F5 Big-ip Webaccelerator All All All All
Application F5 Big-ip Webaccelerator All All All All
Application F5 Big-ip Websafe All All All All
Application F5 Big-ip Websafe All All All All
Application F5 Big-ip Websafe All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA F5 BIG-IP affected 21.1.0 21.1.0.1 custom Not specified
CNA F5 BIG-IP affected 21.0.0 21.0.0.3 custom Not specified
CNA F5 BIG-IP affected 17.5.0 17.5.1.8 custom Not specified
CNA F5 BIG-IP affected 17.1.0 17.1.3.4 custom Not specified

References

ReferenceSourceLinkTags
my.f5.com/manage/s/article/K000161728 [email protected] my.f5.com Mitigation, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: F5 acknowledges Michał Majchrowicz, Marcin Wyczechowski and Piotr Zdunek (members of the AFINE Team) for bringing this issue to our attention and following the highest standards of coordinated disclosure. (en)

Additional Advisory Data

Workarounds

CNA: To mitigate this vulnerability, you may take the following actions: When you have finished using the BIG-IP Configuration utility, you should log off and close all instances of your web browser. Do not use the same web browser that you use to manage the BIG-IP Configuration utility for any other purposes, such as browsing the internet. If you must perform both actions on the same client machine, F5 recommends that you do so in separate browsers

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