CVE-2026-77708

Stack‑Based Buffer Overflow in SonicOS TACACS+ Client Causing Unauthenticated Denial of Service

Published Nov 6, 2026 CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Description
A pre-authentication stack-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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Sonicwall
Sonicwall sonicos
Vendors & Products Sonicwall
Sonicwall sonicos
Type Values Removed Values Added
Title Stack‑Based Buffer Overflow in SonicOS TACACS+ Client Causing Unauthenticated Denial of Service
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Description A pre-authentication stack-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.
Weaknesses CWE-121
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
sonicwall
Published
Updated
Nov 11, 2026, 6:17 PM
Reserved
Aug 21, 2026, 8:45 AM
Status
Awaiting Analysis
Published
Nov 6, 2026, 7:17 PM
Modified
Nov 6, 2026, 9:13 PM