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CVE-2005-1021
Memory leak in Secure Shell (SSH) in Cisco IOS 12.0 through 12.3, when authenticating against a TACACS+ server, allows remote attackers to…
- 7.1HighCVSS base score
- 1.8%Exploitation in 30 daysEPSS · top 21% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Memory leak in Secure Shell (SSH) in Cisco IOS 12.0 through 12.3, when authenticating against a TACACS+ server, allows remote attackers to cause a denial of service (memory consumption) via an incorrect username or password.
Timeline
Published
- 1 day later
· 1 day later
ID reserved
By mitre
- 19 years later
· 19 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
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)
- 1.8% · top 21% of all CVEs (11 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
n/a
- affected n/a
References
References7
- 1013655 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- cisco-ios-memory-leak-dos(19991) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- 15303 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- 13042 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 14854 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 20050406 Vulnerabilities in Cisco IOS Secure Shell Server (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
- oval:org.mitre.oval:def:5687 (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)
- EUVD EUVD-2005-1024 (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://cveledger.app/cve/CVE-2005-1021)Record last updated .