CVE Catalog

CVE-2026-42369

CriticalCVSS 10.0
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.54%

45th percentile - higher than 45% of all known CVEs

Summary

GV-VMS V20 contains a stack overflow in the gvapi endpoint authentication mechanism, where a base64-decoded string is copied into a fixed 256-character buffer without bounds checking. Because the data is fully attacker-controlled and the web server is compiled without ASLR, the vulnerability can be easily exploited to achieve remote code execution as SYSTEM.

Risk Assessment

An unauthenticated attacker could gain full SYSTEM-level control of the host, posing a critical risk to confidentiality, integrity, and availability. Installations with the WebCam Server enabled are especially exposed.

Recommendation

Update GV-VMS to a version containing the fix, or restrict access to the gvapi endpoint and WebCam Server. Consider disabling remote access if it is not required.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS