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CVE-2026-42919: F5 BIG-IP Appliance Mode Vulnerability

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-13 · updated 2026-10-26
• Weakness: CWE-121

Description

A vulnerability exists in BIG-IP systems that may allow an authenticated attacker with administrative access to escalate their privileges. A successful exploit may allow the attacker to cross a security boundary.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 BIG-IP APM: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• BIG-IP: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Advanced Web Application Firewall: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Analytics: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Networks, Inc. BIG-IP (AAM): from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• BIG-IP ASM: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Application Visibility And Reporting: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Automation Toolchain: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Carrier-Grade Nat: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 BIG-IP Container Ingress Services: from 17.1.0 through 17.1.3; from 17.5.0 (excl.) through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Ddos Hybrid Defender: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 BIG-IP DNS: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Edge Gateway: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Fraud Protection Service: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Global Traffic Manager: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Link Controller: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 BIG-IP (LTM): from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Networks, Inc. BIG-IP (PEM): from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Ssl Orchestrator: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Webaccelerator: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0
• F5 Big-Ip Websafe: from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0

References

• https://my.f5.com/manage/s/article/K000158971

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