Medium severity · published May 13, 2026
CVE-2026-42408
BIG-IP DNS tmsh vulnerability
4.4
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 0% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
BIG-IP · F5
17.5.0 before 17.5.1.4; 17.1.0 before 17.1.3.1; 16.1.0 · source: vendor
BA
Big-ip Access Policy Manager · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BA
Big-ip Advanced Firewall Manager · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BA
Big-ip Advanced Web Application Firewall · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BA
Big-ip Analytics · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BA
Big-ip Application Acceleration Manager · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BA
Big-ip Application Security Manager · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BA
Big-ip Application Visibility And Reporting · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BA
Big-ip Automation Toolchain · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BC
Big-ip Carrier-grade Nat · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BC
Big-ip Container Ingress Services · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
BD
Big-ip Ddos Hybrid Defender · F5
16.1.0 through 16.1.6; 17.1.0 through 17.1.3; 17.5.0 through 17.5.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42408
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42408
Mitigation
https://my.f5.com/manage/s/article/K000157981
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