CVE-2023-4494: Stack-based buffer overflow vulnerability in Easy Chat Server 3.1 version

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-4494 is a critical-severity flaw (CVSS 9.8) affecting easy chat server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow vulnerability in Easy Chat Server 3.1 version. An attacker could send an excessively long username string to the register.ghp file asking for the name via a GET request resulting in arbitrary code execution on the remote machine.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-119
Published	2023-10-04
Last modified	2026-06-17

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: easy chat server project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-10-04 13:15 UTCPublished CVE record published
2026-06-17 06:37 UTCUpdated Record last modified

easy chat server project easy chat server DOWNGRADE

Affected: 3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1

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 3.1 (Debian / Ubuntu)

apt-cache madison easy-chat-server sudo apt install easy-chat-server=<VERSION_BEFORE_3.1> 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_3.1> 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.

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-2023-4494?

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

Is CVE-2023-4494 being exploited?

CVE-2023-4494 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-2023-4494 affect?

CVE-2023-4494 affects easy chat server. Severity is critical (CVSS 9.8). Stack-based buffer overflow vulnerability in Easy Chat Server 3.1 version. An attacker could send an excessively long username string to the register.ghp file asking for the name via a GET request resulting in arbitrary code execution on th

How urgent is CVE-2023-4494?

Priority 55/100. Critical severity; Remotely exploitable, no login, no user action

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-2019-25613 HIGH 7.5 DOWNGRADE Easy Chat Server 3.1 contains a denial of service vulnerability that allows remote attackers to crash the appl

References

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