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CVE-2005-1020
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…
High7.1EPSS 1.7%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.1 | AV:N/AC:M/Au:N/C:N/I:N/A:C |
- EPSS (exploitation in 30 days)
- 1.7% · top 22% of all CVEs (4 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Weakness
Affected products
n/a
- affected n/a
References (8)
- 1013655 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- 13043 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- cisco-ios-sshv2-tacacs-authentication-dos(19987) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- cisco-ios-authentication-send-dos(19989) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- 14854 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- cisco-ios-ssh-message-log-dos(19990) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- 20050406 Vulnerabilities in Cisco IOS Secure Shell Server (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
- oval:org.mitre.oval:def:5455 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2005-1020)Record last updated .