CVE-1999-1085

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 1998-06-12 · updated 2026-06-16

Description

SSH 1.2.25, 1.2.23, and other versions, when used in in CBC (Cipher Block Chaining) or CFB (Cipher Feedback 64 bits) modes, allows remote attackers to insert arbitrary data into an existing stream between an SSH client and server by using a known plaintext attack and computing a valid CRC-32 checksum for the packet, aka the "SSH insertion attack."

Affected products

SSH Secure Shell: 1.2.23, 1.2.25

References

http://marc.info/?l=bugtraq&m=90221103125884&w=2
http://marc.info/?l=bugtraq&m=90221104525878&w=2
http://www.iss.net/security_center/static/1126.php
http://www.kb.cert.org/vuls/id/13877
http://marc.info/?l=bugtraq&m=90221103125884&w=2
http://marc.info/?l=bugtraq&m=90221104525878&w=2
http://www.iss.net/security_center/static/1126.php
http://www.kb.cert.org/vuls/id/13877

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