GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other security devices. It is a native application accessed locally, but it is also possible to enable remote access via the "WebCam Server" feature. Once enabled, it is possible to access to the management and monitoring feature via a regular Web interface. This webersever is another native application, compiled without ASLR, which makes exploitation much easier and more likely. Most of the features require authentication before being reachable and leverage a standard login page to grant access. However the `gvapi` endpoint uses its own authentication mechanism via an `HTTP Authorization` header. It supports both `Basic` authentication and the `Digest` modes of authentication.   #### Stack-overflow via unbound copy of base64 decoded string The `b64decoder` string is sized dynamically, but it is then copied to the `Buffer` stack variable one character at the time at [0], and there's no bound-check. As such, if the decoded string is bigger than 256 characters (the size of the `Buffer` variable) then a stack overflow occurs. Because the data can be fully controlled by an attacker and lack of ASLR, this vulnerability can easily be exploited to gain full code execution as SYSTEM on the machine running the service.
History

Mon, 04 May 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 04 May 2026 01:15:00 +0000

Type Values Removed Values Added
Description GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other security devices. It is a native application accessed locally, but it is also possible to enable remote access via the "WebCam Server" feature. Once enabled, it is possible to access to the management and monitoring feature via a regular Web interface. This webersever is another native application, compiled without ASLR, which makes exploitation much easier and more likely. Most of the features require authentication before being reachable and leverage a standard login page to grant access. However the `gvapi` endpoint uses its own authentication mechanism via an `HTTP Authorization` header. It supports both `Basic` authentication and the `Digest` modes of authentication.   #### Stack-overflow via unbound copy of base64 decoded string The `b64decoder` string is sized dynamically, but it is then copied to the `Buffer` stack variable one character at the time at [0], and there's no bound-check. As such, if the decoded string is bigger than 256 characters (the size of the `Buffer` variable) then a stack overflow occurs. Because the data can be fully controlled by an attacker and lack of ASLR, this vulnerability can easily be exploited to gain full code execution as SYSTEM on the machine running the service.
Title GeoVision GV-VMS V20 WebCam Server stack overflow vulnerability
First Time appeared Geovision Inc.
Geovision Inc. gv-vms V20.0.2
Weaknesses CWE-787
CPEs cpe:2.3:a:geovision_inc.:gv-vms_v20.0.2:v20.0.2:*:windows:*:*:*:*:*
cpe:2.3:a:geovision_inc.:gv-vms_v20.0.2:v21.0.0:*:windows:*:*:*:*:*
Vendors & Products Geovision Inc.
Geovision Inc. gv-vms V20.0.2
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GV

Published:

Updated: 2026-05-04T12:51:44.914Z

Reserved: 2026-04-26T23:39:08.350Z

Link: CVE-2026-42369

cve-icon Vulnrichment

Updated: 2026-05-04T12:51:38.659Z

cve-icon NVD

Status : Received

Published: 2026-05-04T01:16:04.153

Modified: 2026-05-04T01:16:04.153

Link: CVE-2026-42369

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-04T02:30:34Z