CVE-2005-1020

Severity: high (CVSS 7.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2005-05-02 · updated 2026-06-16
Weakness: CWE-287

Description

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.

Affected products

Cisco IOS: 12.0, 12.0(23)s4, 12.0(23)s5, 12.0(24)s1, 12.0(24)s4, 12.0(24)s5 (+331)

References

http://secunia.com/advisories/14854
http://www.cisco.com/warp/public/707/cisco-sa-20050406-ssh.shtml
http://www.securityfocus.com/bid/13043
http://www.securitytracker.com/alerts/2005/Apr/1013655.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/19987
https://exchange.xforce.ibmcloud.com/vulnerabilities/19989
https://exchange.xforce.ibmcloud.com/vulnerabilities/19990
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5455
http://secunia.com/advisories/14854
http://www.cisco.com/warp/public/707/cisco-sa-20050406-ssh.shtml
http://www.securityfocus.com/bid/13043
http://www.securitytracker.com/alerts/2005/Apr/1013655.html

Get alerted when CVE-2005-1020 or the next vulnerability affects your stack