CVE-2000-0453

NONECVSS 0.0Weaponized

0.0

XFree86 3.3.x and 4.0 allows a user to cause a denial of service via a negative counter value in a malformed TCP packet that is sent to port 6000.

CVSS v3: —
EG Score: —
EPSS: 90.6%
KEV: Not listed

Published

May 18, 2000

Last Modified

April 16, 2026

References (6)

cve@mitreftp://ftp.caldera.com/pub/security/OpenLinux/CSSA-2000-012.0.txt
cve@mitrehttp://archives.neohapsis.com/archives/bugtraq/2000-05/0223.html
cve@mitrehttp://www.securityfocus.com/bid/1235
af854a3a-2127-422b-91ae-364da2661108ftp://ftp.caldera.com/pub/security/OpenLinux/CSSA-2000-012.0.txt
af854a3a-2127-422b-91ae-364da2661108http://archives.neohapsis.com/archives/bugtraq/2000-05/0223.html
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/1235

Data Freshness Timeline

(refreshed 11× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-27 13:37 UTCepss_batch
2026-05-27 13:37 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-24 16:42 UTCepss_batch
2026-05-21 22:38 UTCepss_batch
2026-05-20 22:36 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-18 21:29 UTCepss_batch
2026-05-18 21:29 UTCepss_batch

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-19950✓ verified
First seen May 18, 2000
XFree86 X11R6 3.3.5/3.3.6/4.0 Xserver - Denial of Service
Open source ↗

Frequently asked(4)

What is CVE-2000-0453?

CVE-2000-0453 is a none vulnerability published on May 18, 2000. XFree86 3.3.x and 4.0 allows a user to cause a denial of service via a negative counter value in a malformed TCP packet that is sent to port 6000.

When was CVE-2000-0453 disclosed?

CVE-2000-0453 was first published in the National Vulnerability Database on May 18, 2000, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2000-0453 actively exploited?

CVE-2000-0453 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2000-0453?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2000-0453, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2000-0453

Explore →

Is Your Infrastructure Affected by CVE-2000-0453?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2000-0453

📅 Published

🔄 Last Modified

🔗 References (6)