What is CVE-2003-1000?

CVE-2003-1000 is a high-severity vulnerability in Xchat, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2004-01-05.

How severe is CVE-2003-1000?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Xchat

CVE-2003-1000

xchat 2.0.6 allows remote attackers to cause a denial of service (crash) via a passive DCC request with an invalid ID number, which causes a null dereference.

Published 2004-01-05 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.026 (84.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

Xchat — versions 2.0.6

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

mail.nl.linux.org/xchat-announce/2003-12/msg00000.html (Patch, Broken Link, Vendor Advisory)
marc.info/ (mailing-list, Mailing List)

Frequently asked questions

What is CVE-2003-1000?: CVE-2003-1000 is a high-severity vulnerability in Xchat, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2004-01-05.
How severe is CVE-2003-1000?: High severity. CVSS v3 base score is 7.5 out of 10.