GeoVision GV-VMS V20 WebCam Server stack overflow vulnerability
Summary
| CVE | CVE-2026-42369 |
|---|---|
| State | PUBLISHED |
| Assigner | GV |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-04 01:16:04 UTC |
| Updated | 2026-05-19 15:22:14 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 10 CRITICAL from 0df08a0e-a200-4957-9bb0-084f562506f9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.001870000 probability, percentile 0.400920000 (date 2026-05-26)
Problem Types: CWE-787 | CWE-787 CWE-787 Out-of-bounds write
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 0df08a0e-a200-4957-9bb0-084f562506f9 | Secondary | 10 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 10 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | GeoVision Inc. | GV-VMS V20.0.2 | affected V20.0.2 | Windows |
| CNA | GeoVision Inc. | GV-VMS V20.0.2 | unaffected V20.0.2.10 | Windows |
| CNA | GeoVision Inc. | GV-VMS V20.0.2 | unaffected V20.1.0.0 | Windows |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| https/talosintelligence.com/vulnerability_reports | 0df08a0e-a200-4957-9bb0-084f562506f9 | https | |
| www.geovision.com.tw/cyber_security.php | 0df08a0e-a200-4957-9bb0-084f562506f9 | www.geovision.com.tw | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Philippe Laulheret of Cisco Talos. (en)
CNA: Kelly Patterson of Cisco Talos. (en)
CNA: Martin Zeiser of Cisco Talos. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-02-17T01:32:00.000Z | Initial Vendor Contact |
Solutions
CNA: GeoVision GV-VMS version V20.1.0 has patched the reported vulnerability. User is recommended to download the update from GeoVision's offical website (https://www.geovision.com.tw/download/product/GV-VMS%20V20) or contact GeoVision Support team For User currently running V20.0.2 may also visit the following link to download the V20.0.2.10 patch file that fixed the vulnerability. https://php.gvdip.com/phpbb3/viewtopic.php?t=3326