Buffer overflow in SonicWall Sonicos

CVE-2026-82308

A pre-authentication heap-based buffer overflow vulnerability has been identified in the SonicOS SSL-VPN service, which could potentially enable a remote unauthenticated attacker to cause an application level denial of service.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

  • SonicWall Sonicos — versions 7.3.3-7015 and older versions, 8.2.2-8015 and older versions

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-82308?
CVE-2026-82308 is a high-severity vulnerability in SonicWall Sonicos, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-11-06.
How severe is CVE-2026-82308?
High severity. CVSS v3 base score is 7.5 out of 10.