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Advisory severityUnratedSonicWall

Advisory [CVE-2026-77708] 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

This SonicWall security advisory covers CVE-2026-77708 affecting SonicOS.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-77708 Source published Source updated

VulniPulse record published

CVE-2026-77708
Affected products & platforms
SonicWallSonicOS Firewalls
Open source advisory

Summary

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.

Is CVE-2026-77708 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-77708 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-77708?

The advisory VulniPulse tracks names no fixed release. Follow SonicWall's guidance for workarounds and updates.

Confirm against the vendor advisory before you patch.

Affected versions
  • SonicOS 7.3.3-7015 and older versions
  • SonicOS 8.2.2-8015 and older versions

Official advisory · medium-confidence parse· fetched 1 day ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.

Official advisory · medium-confidence parse· fetched 1 day ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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.

Official advisory · medium-confidence parse· fetched 1 day ago·verify at source

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