CVE-2023-37929Network attack vector

Authenticated service interruption via CGI buffer overflow

Published May 21, 2024 · Updated Aug 2, 2024

Buffer overflow in the CGI program of Zyxel VMG3625-T50B firmware 5.50(ABPM.8)C0 allows remote authenticated users to interrupt service. The CGI program copies crafted HTTP request data without checking the destination buffer size; Zyxel has not identified the handler or stated whether the device crashes or hangs. Access to an authenticated web-management session is required, and the documented consequence is limited to denial of service.

CVSS severity6.5
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the CGI program of Zyxel VMG3625-T50B firmware 5.50(ABPM.8)C0 allows remote authenticated users to interrupt service. The CGI program copies crafted HTTP request data without checking the destination buffer size; Zyxel has not identified the handler or stated whether the device crashes or hangs. Access to an authenticated web-management session is required, and the documented consequence is limited to denial of service.

The record

CVE
CVE-2023-37929
Published
May 21, 2024
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5ZyxelCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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