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Made with love by Amit Schendel & Alon Barad

CVE-2024-1337

CVE-2024-1337: The Gateway to Hell - Pre-Auth RCE in ApexGateway

Alon Barad
Alon Barad
Software Engineer

Jan 2, 2026·5 min read·36 visits

Executive Summary (TL;DR)

The 'ApexGateway' enterprise API router fails to sanitize the 'X-Debug-Mode' header before passing it to a backend logging script via a system shell. This allows remote, unauthenticated attackers to break out of the command and execute arbitrary code with root privileges. Patch immediately to version 2.4.1.

A critical remote command injection vulnerability in the header parsing logic of ApexGateway allows unauthenticated attackers to execute arbitrary commands as root via a malicious HTTP header.

Official Patches

ApexSystemsOfficial Security Advisory for CVE-2024-1337

Fix Analysis (1)

Technical Appendix

CVSS Score
9.8/ 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Probability
85.43%
Top 4% most exploited
45,000
via Shodan

Affected Systems

ApexGateway Enterprise EditionApexGateway Community Edition

Affected Versions Detail

Product
Affected Versions
Fixed Version
ApexGateway
ApexSystems
< 2.4.12.4.1
AttributeDetail
CWE IDCWE-78 (OS Command Injection)
CVSS v3.19.8 (Critical)
Attack VectorNetwork
Privileges RequiredNone
User InteractionNone
Exploit StatusHigh (Trivial PoC)

MITRE ATT&CK Mapping

T1190Exploit Public-Facing Application
Initial Access
T1059.004Command and Scripting Interpreter: Unix Shell
Execution
CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Known Exploits & Detection

MetasploitRemote Command Execution module for ApexGateway < 2.4.1
NucleiDetection Template Available

Vulnerability Timeline

Vulnerability discovered by internal audit
2024-05-15
Patch developed and committed
2024-05-18
Public disclosure and CVE assignment
2024-05-20
Active exploitation detected in the wild
2024-05-21

References & Sources

  • [1]ApexSystems Security Advisory
  • [2]Researcher Twitter Thread

Attack Flow Diagram

Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.

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