PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.

PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.

Affected: Ubuntu:16.04:LTS: putty, Ubuntu:18.04:LTS: putty, Ubuntu:20.04:LTS: putty, Ubuntu:22.04:LTS: putty, Ubuntu:24.04:LTS: putty, Ubuntu:25.10: putty, Ubuntu:26.04:LTS: putty

PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in PuTTY ausnutzen, um einen Denial of Service Angriff durchzuführen, um Daten zu manipulieren und möglicherweise Spoofing-Angriffe durchzuführen.