---
id: CVE-2026-77709
title: >-
  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 applicati…
summary: >-
  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 applicati…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: adp
cwe:
  - CWE-122
vendor: SonicWall
product: SonicOS
affected:
  - SonicOS 7.3.3-7015 and older versions
  - SonicOS 8.2.2-8015 and older versions
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T19:21:51.287676Z'
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T19:22:06.640Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-77709'
references:
  - url: 'https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0014'
tags:
  - cve.org
ingestedAt: '2026-11-06T20:03:04.278Z'
---

## Overview

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.

## Affected

- `SonicOS 7.3.3-7015 and older versions`
- `SonicOS 8.2.2-8015 and older versions`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.