CVE-2026-77708 · Infrastructure
NO FIX YET
A stack-based buffer overflow in the SonicOS TACACS+ authentication client can be triggered before login under specific conditions. A remote unauthenticated attacker can cause an application-level denial of service.
first public Nov 6, 2026 · 1 source
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Organisations running SonicWall firewalls on SonicOS with TACACS+ authentication enabled are the exposed systems. The sources do not state the affected versions or the exact conditions that must hold. Sites that do not use TACACS+ for administrator login are likely outside the described path, but the sources do not confirm this.
Not affected if no-tacacs-auth
Who cares firewall, sonicos, sonicwall, tacacs+
Unknown from the sources.
No fix yet, per the sources.
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.
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
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