What is CVE-2026-66153?

CVE-2026-66153 is a high-severity vulnerability in SonicWall Netextender, classified under Improper Link Resolution Before File Access. CVSS score: 7.0/10. Published 2026-08-25.

How severe is CVE-2026-66153?

High severity. CVSS v3 base score is 7.0 out of 10.

Vulnerability in SonicWall Netextender

CVE-2026-66153

The NEService auto-upgrade process insecurely handles temporary files in SonicWall NetExtender Linux client which allows an attacker to manipulate file paths.

Published 2026-08-25 · last modified 2026-08-28.

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (13.3th percentile), scored 2026-10-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

SonicWall Netextender — versions 10.3.5 and earlier versions

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0013 (vendor-advisory)

Frequently asked questions

What is CVE-2026-66153?: CVE-2026-66153 is a high-severity vulnerability in SonicWall Netextender, classified under Improper Link Resolution Before File Access. CVSS score: 7.0/10. Published 2026-08-25.
How severe is CVE-2026-66153?: High severity. CVSS v3 base score is 7.0 out of 10.