CVE-2001-1469: SSH

Medium severity, CVSS 5.0. EPSS: 1.2% chance of exploitation in the next 30 days.

The RC4 stream cipher as used by SSH1 allows remote attackers to modify messages without detection by XORing the original message's cyclic redundancy check (CRC) with the CRC of a mask consisting of all the bits of the original message that were modified.

Affected products

• SSH SSH: version 1.2.24 only; version 1.2.25 only; version 1.2.26 only; version 1.2.27 only; version 1.2.28 only; version 1.2.29 only; …

Published 2001-01-18. Last modified 2026-06-16.