CVE-2004-2466: chat.ghp in Easy Chat Server 1.2 allows remote attackers to cause a denial of service (server crash) via a lon

This week

MEDIUM 5.0DOWNGRADE

CVE-2004-2466 is a medium-severity flaw (CVSS 5.0) affecting easy chat server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

chat.ghp in Easy Chat Server 1.2 allows remote attackers to cause a denial of service (server crash) via a long username parameter, possibly due to a buffer overflow. NOTE: it was later reported that 2.2 is also affected.

Why this priority

EPSS top 1%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	74.7% (top 1%)
CISA exploited list	No
Weakness	CWE-119
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: efs software

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:09 UTCUpdated Record last modified

efs software easy chat server DOWNGRADE

Affected: 1.2 · 2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2

1. Check installed version

apt-cache policy easy-chat-server || rpm -q easy-chat-server || easy-chat-server --version

2. No fixed release: DOWNGRADE to a release before 1.2 (Debian / Ubuntu)

apt-cache madison easy-chat-server sudo apt install easy-chat-server=<VERSION_BEFORE_1.2> sudo apt-mark hold easy-chat-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list easy-chat-server sudo dnf downgrade easy-chat-server-<VERSION_BEFORE_1.2> sudo dnf versionlock add easy-chat-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: EFS Easy Chat Server 2.2 - Remote Denial of Service
Exploit-DB: Easy Chat Server 3.1 - Remote Stack Buffer Overflow (SEH)
Exploit-DB: EFS Easy Chat Server - Authentication Request Handling Buffer Overflow (Metasploit)
Exploit-DB: EFS Easy Chat Server 3.1 - Remote Stack Buffer Overflow
Metasploit: EFS Easy Chat Server Authentication Request Handling Buffer Overflow

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2004-2466?

easy chat server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2466 being exploited?

CVE-2004-2466 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2004-2466 affect?

CVE-2004-2466 affects easy chat server. Severity is medium (CVSS 5.0). chat.ghp in Easy Chat Server 1.2 allows remote attackers to cause a denial of service (server crash) via a long username parameter, possibly due to a buffer overflow. NOTE: it was later reported that 2.2 is also affected.

How urgent is CVE-2004-2466?

Priority 47/100. EPSS top 1%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2024-0695 MEDIUM 4.3 DOWNGRADE A vulnerability, which was classified as problematic, has been found in EFS Easy Chat Server 3.1
CVE-2023-4497 MEDIUM 6.1 UPGRADE Easy Chat Server, in its 3.1 version and before, does not sufficiently encrypt user-controlled inputs, resulti
CVE-2023-4496 MEDIUM 6.1 UPGRADE Easy Chat Server, in its 3.1 version and before, does not sufficiently encrypt user-controlled inputs, resulti
CVE-2023-4495 MEDIUM 6.1 UPGRADE Easy Chat Server, in its 3.1 version and before, does not sufficiently encrypt user-controlled inputs, resulti
CVE-2023-4494 CRITICAL 9.8 DOWNGRADE Stack-based buffer overflow vulnerability in Easy Chat Server 3.1 version

References

← Back to latest CVEs