CVE-2026-77709 · Infrastructure
NO FIX YET
A heap-based buffer overflow in the SonicOS TACACS+ authentication client can be triggered before login. In specific conditions, a remote unauthenticated attacker can crash an application and cause a denial of service.
first public Nov 6, 2026 · 1 source
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Organizations running SonicWall firewalls with SonicOS that use TACACS+ for administrator authentication. The sources do not state which configurations trigger the specific conditions, so whether a given deployment is exposed is unknown. Teams not using SonicOS or TACACS+ can skip it.
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 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.
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
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