# CVE-2002-0518

## Summary

- **CVE ID:** CVE-2002-0518
- **Severity:** UNKNOWN
- **CVSS Score:** 0.04
- **CWE:** N/A
- **Published:** Jun 11, 2002
- **Last Modified:** Mar 16, 2026

## Description

The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc)
- [CNA](http://www.osvdb.org/6046)
- [CNA](http://www.iss.net/security_center/static/8873.php)
- [CNA](http://www.iss.net/security_center/static/8875.php)
- [CNA](http://www.securityfocus.com/bid/4524)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.11%
- **EPSS Percentile:** 77.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._