CVE-2026-42370Network attack vector

Pre-auth code execution via unchecked username copy

Published May 4, 2026 · Updated May 4, 2026

Stack overflow in GeoVision GV-VMS 20.0.2 WebCam Server Login allows remote attackers to execute code via an unauthenticated HTTP request. The login logger passes the request's id username to strcpy without a length check, copying it into a fixed stack buffer and permitting return-address overwrite. WebCam Server must be enabled and reachable; successful exploitation runs code as SYSTEM on the Windows host.

CVSS severity9.0
Critical
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

Stack overflow in GeoVision GV-VMS 20.0.2 WebCam Server Login allows remote attackers to execute code via an unauthenticated HTTP request. The login logger passes the request's id username to strcpy without a length check, copying it into a fixed stack buffer and permitting return-address overwrite. WebCam Server must be enabled and reachable; successful exploitation runs code as SYSTEM on the Windows host.

The record

CVE
CVE-2026-42370
Published
May 4, 2026
Updated
May 4, 2026
Vendor
GeoVision
Product
GV-VMS
Classifications
CWE-787, CAPEC-100, CAPEC-242, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 2026Record 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=20.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GeoVision · GV-VMSversion=20.0.2

Published CVSS scores

9.0GeoVision CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8NIST NVDCVSS: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-787Out-of-bounds Write
CAPEC-100Overflow Buffers
CAPEC-242Code Injection
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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