CVE-2023-4494Public exploitNetwork attack vector

Remote code execution via oversized registration username

Published Oct 4, 2023 · Updated Sep 5, 2024

Stack-based buffer overflow in Easy Chat Server 3.1 and earlier allows remote attackers to execute arbitrary code through registration. The register.ghp handler copies an excessively long username from a GET request into an insufficiently sized stack buffer without bounds checking. No authentication or user interaction is required, and successful exploitation runs attacker-controlled code on the server.

CVSS severity9.8
Critical
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Easy Chat Server 3.1 and earlier allows remote attackers to execute arbitrary code through registration. The register.ghp handler copies an excessively long username from a GET request into an insufficiently sized stack buffer without bounds checking. No authentication or user interaction is required, and successful exploitation runs attacker-controlled code on the server.

The record

CVE
CVE-2023-4494
Published
Oct 4, 2023
Updated
Sep 5, 2024
Vendor
EFS Software, Inc.
Product
Easy Chat Server
Classifications
CWE-119, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EFS Software, Inc. · Easy Chat Serverversion=0 <=3.1

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8INCIBECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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