CVE Catalog

CVE-2005-1020

High
Published: Translated: NVD NIST

Summary

A vulnerability in Secure Shell (SSH) 2 in Cisco IOS versions 12.0 through 12.3 allows a remote attacker to cause a denial of service (device reload) through three different scenarios: using a username containing a domain name when authenticating via a TACACS+ server, sending a send command by a logged-in user during the login phase of a new SSH session, or terminating an SSH session while the server is sending data with IOS logging messages.

Risk Assessment

The risk involves the possibility of remotely triggering a device crash, leading to network disruption and potential loss of service access.

Recommendation

It is recommended to upgrade Cisco IOS to a version later than 12.3, which includes fixes for this vulnerability, and consider restricting SSH access to trusted IP addresses.

Related vulnerabilities

Original NVD description (English source)

Secure Shell (SSH) 2 in Cisco IOS 12.0 through 12.3 allows remote attackers to cause a denial of service (device reload) (1) via a username that contains a domain name when using a TACACS+ server to authenticate, (2) when a new SSH session is in the login phase and a currently logged in user issues a send command, or (3) when IOS is logging messages and an SSH session is terminated while the server is sending data.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS