CVE-2004-2646

NONECVSS 0.0Weaponized

0.0

The addUser function in UserManager.java in Free Web Chat 2.0 allows remote attackers to cause a denial of service (uncaught NullPointerException) via unknown attack vectors that cause the usrName variable to be null.

CVSS v3: —
EG Score: —
EPSS: 93.7%
KEV: Not listed

Published

December 31, 2004

Last Modified

April 16, 2026

References (12)

cve@mitrehttp://archives.neohapsis.com/archives/fulldisclosure/2004-08/0102.html
cve@mitrehttp://marc.info/?l=bugtraq&m=109164397601049&w=2
cve@mitrehttp://securitytracker.com/alerts/2004/Aug/1010851.html
cve@mitrehttp://www.osvdb.org/8369
cve@mitrehttp://www.securityfocus.com/bid/10863
cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/16893
af854a3a-2127-422b-91ae-364da2661108http://archives.neohapsis.com/archives/fulldisclosure/2004-08/0102.html
af854a3a-2127-422b-91ae-364da2661108http://marc.info/?l=bugtraq&m=109164397601049&w=2
af854a3a-2127-422b-91ae-364da2661108http://securitytracker.com/alerts/2004/Aug/1010851.html
af854a3a-2127-422b-91ae-364da2661108http://www.osvdb.org/8369
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/10863
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/16893

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
2026-05-29 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
2026-05-27 13:37 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-22 21:15 UTCepss_batch
2026-05-21 22:38 UTCepss_batch
2026-05-20 22:36 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

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-24351✓ verified
First seen Aug 4, 2004
Free Web Chat Initial Release - UserManager.java Null Pointer Denial of Service
Open source ↗

Frequently asked(4)

What is CVE-2004-2646?

CVE-2004-2646 is a none vulnerability published on December 31, 2004. The addUser function in UserManager.java in Free Web Chat 2.0 allows remote attackers to cause a denial of service (uncaught NullPointerException) via unknown attack vectors that cause the usrName variable to be null.

When was CVE-2004-2646 disclosed?

CVE-2004-2646 was first published in the National Vulnerability Database on December 31, 2004, 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-2004-2646 actively exploited?

CVE-2004-2646 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2004-2646?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2004-2646, 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-2004-2646

Explore →

Is Your Infrastructure Affected by CVE-2004-2646?

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

Start Free Scan →Browse All CVEs

CVE-2004-2646

📅 Published

🔄 Last Modified

🔗 References (12)