CVE-2002-0640: OpenBSD OpenSSH

High severity, CVSS 10.0. EPSS: 27.3% chance of exploitation in the next 30 days.

Buffer overflow in sshd in OpenSSH 2.3.1 through 3.3 may allow remote attackers to execute arbitrary code via a large number of responses during challenge response authentication when OpenBSD is using PAM modules with interactive keyboard authentication (PAMAuthenticationViaKbdInt).

Affected products

• OpenBSD OpenSSH: version 1.2.2 only; version 1.2.3 only; version 2.1 only; version 2.1.1 only; version 2.2 only; version 2.3 only; …

Published 2002-07-03. Last modified 2026-06-16.