CVE-2017-3204: Golang Crypto

High severity, CVSS 8.1. EPSS: 3.2% chance of exploitation in the next 30 days.

The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism.

Affected products

• Golang Crypto: up to and including 2017-03-17

Published 2017-04-04. Last modified 2026-06-17.