CVE-2026-42408: BIG-IP DNS tmsh vulnerability
Analyzed
Published 13-05-2026Last modified 13-05-2026
Vulnerability summary
CVE-2026-42408 is a medium (CVSS 6.7) vulnerability in f5 big-ip. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.1% of scored vulnerabilities.
CVSS score
6.7/10
010
Medium · v4.0 (CVE.org)EPSS score
0.11%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 13-05-2026PublishedVulnerability first disclosed.
- 13-05-2026Last modifiedVulnerability information updated.
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 metrics
4 scores · 2 sources · 2 versionsMedium 6.7Preferred score · CVE.org (CNA)
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:NSourcesAll 2 agree
- NVDNIST6.7MediumCVSS: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
Medium 4.4Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:NSourcesAll 2 agree
- NVDNIST4.4MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.11%
Chance of exploitation in the next 30 days
Percentile
1%
Versus all other CVEs
30-day change
Increase +0.03 pp
From 0.08% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
F522 products
- big-ip≥ 17.5.0, < 17.5.1.4 | ≥ 17.1.0, < 17.1.3.1 | ≥ 16.1.0 (No fix recorded)
- big-ip_access_policy_manager≥ 16.1.0, ≤ 16.1.6 | ≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1
- big-ip_advanced_firewall_manager≥ 16.1.0, ≤ 16.1.6 | ≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1
- big-ip_advanced_web_application_firewall≥ 16.1.0, ≤ 16.1.6 | ≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1
- big-ip_analytics≥ 16.1.0, ≤ 16.1.6 | ≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1
1 vendor · 22 products