CVE-2026-77709

Medium

Description

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

SeverityMedium

CVSS5.9

Exploit probability—

Product

SonicOS

PublishedNov 6, 2026

First seenNov 6, 2026

Weakness typeCWE-122CWE-122

How to fix

Vendor advisories

psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0014

Affected products

Product	Affected versions	Fixed in
SonicWall SonicOS	7.3.3-7015 and older versions, 8.2.2-8015 and older versions	—

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