CVE-2026-42408
MEDIUMCVSS 6.7/10EPSS 0.08%
Last modified
CVE-2026-42408 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed TMOS Shell (tmsh) command that may allow a highly privileged authenticated attacker to view sensitive information. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.. EPSS estimates a 0.08% chance of exploitation in the next 30 days.
Description
When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed TMOS Shell (tmsh) command that may allow a highly privileged authenticated attacker to view sensitive information. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Metrics
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| F5 | Big-Ip Access Policy Manager | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Advanced Firewall Manager | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Analytics | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Application Acceleration Manager | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Application Security Manager | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Application Visibility And Reporting | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Automation Toolchain | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Carrier-Grade Nat | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Container Ingress Services | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Domain Name System | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Edge Gateway | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Fraud Protection Service | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Global Traffic Manager | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Link Controller | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Local Traffic Manager | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Policy Enforcement Manager | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Ssl Orchestrator | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Webaccelerator | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Websafe | >= 16.1.0, <= 16.1.6 |
| F5 | Big-Ip Access Policy Manager | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Access Policy Manager | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Advanced Firewall Manager | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Advanced Firewall Manager | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Analytics | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Analytics | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Application Acceleration Manager | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Application Acceleration Manager | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Application Security Manager | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Application Security Manager | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Application Visibility And Reporting | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Application Visibility And Reporting | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Automation Toolchain | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Automation Toolchain | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Carrier-Grade Nat | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Carrier-Grade Nat | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Container Ingress Services | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Container Ingress Services | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Domain Name System | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Domain Name System | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Edge Gateway | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Edge Gateway | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Fraud Protection Service | >= 17.1.0, <= 17.1.3 |
| F5 | Big-Ip Fraud Protection Service | >= 17.5.0, <= 17.5.1 |
| F5 | Big-Ip Global Traffic Manager | >= 17.1.0, <= 17.1.3 |
Showing 50 of 63 affected configurations. See NVD for the full list.
References
- https://my.f5.com/manage/s/article/K000157981Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-42408?
When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed TMOS Shell (tmsh) command that may allow a highly privileged authenticated attacker to view sensitive information. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
How severe is CVE-2026-42408?
CVE-2026-42408 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.08% probability of exploitation in the next 30 days.
How do I fix CVE-2026-42408?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-42408?
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