Vulnerability in SonicWall Gms
CVE-2026-66154
An insufficient certificate validation in a privileged communication workflow, was identified in a GMS application 9.5.1 (Build 9510.1044) and earlier versions which, under a successful MitM attack and controlled network conditions, could permit unauthorized changes.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- SonicWall Gms — versions 9.5.1 and earlier versions
Weakness classification (CWE)
References
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0011 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-66154?
- CVE-2026-66154 is a high-severity vulnerability in SonicWall Gms, classified under Improper Certificate Validation. CVSS score: 8.3/10. Published 2026-08-11.
- How severe is CVE-2026-66154?
- High severity. CVSS v3 base score is 8.3 out of 10.