CVE-2002-0518

Name: CVE-2002-0518
Creator: NVD / NIST
Published: 2002-08-12T04:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.47%

Last modified Jun 16, 2026

CVE-2002-0518 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.47% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

2.47%

82.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Freebsd	Freebsd	4.5	Release

References

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc
http://www.iss.net/security_center/static/8873.php
http://www.iss.net/security_center/static/8875.phpPatch, Vendor Advisory
http://www.osvdb.org/6046
http://www.securityfocus.com/bid/4524Patch, Vendor Advisory
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc
http://www.iss.net/security_center/static/8873.php
http://www.iss.net/security_center/static/8875.phpPatch, Vendor Advisory
http://www.osvdb.org/6046
http://www.securityfocus.com/bid/4524Patch, Vendor Advisory

Timeline

Published: Aug 12, 2002
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2002-0518?

How severe is CVE-2002-0518?

Severity scoring for CVE-2002-0518 is pending analysis. The EPSS model estimates a 2.47% probability of exploitation in the next 30 days.

How do I fix CVE-2002-0518?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2002-0518?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST