CVE-2026-42369: CWE-787 Out-of-bounds write in GeoVision Inc. GV-VMS V20.0.2
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.
AI Analysis
Technical Summary
GV-VMS V20.0.2 includes a native webserver component that supports remote access via a 'WebCam Server' feature. The 'gvapi' endpoint uses HTTP Authorization headers with Basic and Digest authentication modes. The vulnerability arises from copying a dynamically sized base64 decoded string into a fixed-size 256-character stack buffer without bounds checking, causing a stack overflow (CWE-787). Because the webserver is compiled without ASLR and the attacker controls the input data, this vulnerability can be exploited remotely to execute arbitrary code with SYSTEM privileges on the host running the service.
Potential Impact
Exploitation of this vulnerability allows an unauthenticated remote attacker to execute arbitrary code with SYSTEM-level privileges on the affected system. This results in full compromise of the host running GV-VMS V20.0.2, including confidentiality, integrity, and availability impacts. The CVSS v3.1 base score is 10.0 (critical), reflecting network attack vector, no required privileges or user interaction, and complete system compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, it is recommended to disable the 'WebCam Server' feature if remote access is not required, or restrict network access to the service to trusted hosts only to reduce exposure.
CVE-2026-42369: CWE-787 Out-of-bounds write in GeoVision Inc. GV-VMS V20.0.2
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.
CVSS v3.1
Score 10.0critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
GV-VMS V20.0.2 includes a native webserver component that supports remote access via a 'WebCam Server' feature. The 'gvapi' endpoint uses HTTP Authorization headers with Basic and Digest authentication modes. The vulnerability arises from copying a dynamically sized base64 decoded string into a fixed-size 256-character stack buffer without bounds checking, causing a stack overflow (CWE-787). Because the webserver is compiled without ASLR and the attacker controls the input data, this vulnerability can be exploited remotely to execute arbitrary code with SYSTEM privileges on the host running the service.
Potential Impact
Exploitation of this vulnerability allows an unauthenticated remote attacker to execute arbitrary code with SYSTEM-level privileges on the affected system. This results in full compromise of the host running GV-VMS V20.0.2, including confidentiality, integrity, and availability impacts. The CVSS v3.1 base score is 10.0 (critical), reflecting network attack vector, no required privileges or user interaction, and complete system compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, it is recommended to disable the 'WebCam Server' feature if remote access is not required, or restrict network access to the service to trusted hosts only to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GV
- Date Reserved
- 2026-04-26T23:39:08.350Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f7f4d3cbff5d86108d834a
Added to database: 5/4/2026, 1:22:27 AM
Last enriched: 5/18/2026, 9:21:32 AM
Last updated: 6/17/2026, 5:45:25 PM
Views: 102
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.