CVE-2016-6210: OpenBSD OpenSSH

Medium severity, CVSS 5.9. EPSS: 88.9% chance of exploitation in the next 30 days.

sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.

Affected products

• OpenBSD OpenSSH: up to and including 7.2

Published 2017-02-13. Last modified 2026-06-17.