CVE-2023-43492Network attack vector

Authentication bypass via codesys.cgi stack overflow

Published Oct 19, 2023 · Updated Jan 16, 2025

Stack overflow in affected Weintek cMT HMI firmware allows remote attackers to bypass login authentication via codesys.cgi. The codesys.cgi program writes attacker-controlled web input beyond a stack buffer, enabling control-flow hijacking; the exact parameter and copy operation are undisclosed. No credentials or user interaction are required, but the web server must be network-reachable; exploitation grants access past the login boundary.

CVSS severity9.8
Critical
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in affected Weintek cMT HMI firmware allows remote attackers to bypass login authentication via codesys.cgi. The codesys.cgi program writes attacker-controlled web input beyond a stack buffer, enabling control-flow hijacking; the exact parameter and copy operation are undisclosed. No credentials or user interaction are required, but the web server must be network-reachable; exploitation grants access past the login boundary.

The record

CVE
CVE-2023-43492
Published
Oct 19, 2023
Updated
Jan 16, 2025
Vendor
Weintek
Product
cMT-HDM
Classifications
CWE-121, CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 2025Record 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 <=20210204

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Weintek · cMT-HDMversion=0 <=20210204
Weintek · cMT3071/cMT3072/cMT3090/cMT3103/cMT3151version=0 <=20210218
Weintek · cMT-FHDversion=0 <=20210210

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8ICS-CERTCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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