Vulnerability-Lookup

GHSA-8WJC-Q3QJ-WC8J

Vulnerability from github – Published: 2026-05-04 03:31 – Updated: 2026-05-04 03:31

Details

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.

Severity ?

10.0 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-42369"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-04T01:16:04Z",
    "severity": "CRITICAL"
  },
  "details": "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. \n\n\n\nMost 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.\u00a0\u00a0\n\n\n\n#### Stack-overflow via unbound copy of base64 decoded string\n\nThe `b64decoder` string is sized dynamically, but it is then copied to the `Buffer` stack variable one character at the time at [0], and there\u0027s 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.",
  "id": "GHSA-8wjc-q3qj-wc8j",
  "modified": "2026-05-04T03:31:27Z",
  "published": "2026-05-04T03:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42369"
    },
    {
      "type": "WEB",
      "url": "https://https://talosintelligence.com/vulnerability_reports"
    },
    {
      "type": "WEB",
      "url": "https://www.geovision.com.tw/cyber_security.php"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-42369 (GCVE-0-2026-42369)

Vulnerability from cvelistv5 – Published: 2026-05-04 00:47 – Updated: 2026-05-15 07:45

Title

GeoVision GV-VMS V20 WebCam Server stack overflow vulnerability

Summary

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.

Severity ?

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CWE

CWE-787 - Out-of-bounds write

Assigner

References

2 references

URL	Tags
https://www.geovision.com.tw/cyber_security.php	vendor-advisorythird-party-advisory
https://https://talosintelligence.com/vulnerabili…

Impacted products

1 product

Vendor	Product	Version
GeoVision Inc.	GV-VMS V20.0.2	Affected: V20.0.2 Unaffected: V20.0.2.10 Unaffected: V20.1.0.0

Date Public ?

2026-04-27 00:00

Credits

Philippe Laulheret of Cisco Talos. Kelly Patterson of Cisco Talos. Martin Zeiser of Cisco Talos.

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42369",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-04T00:00:00+00:00",
                "version": "2.0.3"
              },
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          "dateUpdated": "2026-05-05T03:56:13.979Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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      "affected": [
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          "platforms": [
            "Windows"
          ],
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          "versions": [
            {
              "status": "affected",
              "version": "V20.0.2"
            },
            {
              "status": "unaffected",
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            },
            {
              "status": "unaffected",
              "version": "V20.1.0.0"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:geovision_inc.:gv-vms_v20.0.2:v20.0.2.10:*:windows:*:*:*:*:*",
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              ],
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              "operator": "OR"
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              "value": "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. \n\u003cbr\u003e\n\u003cbr\u003eMost 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.\u0026nbsp;\u0026nbsp;\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e#### Stack-overflow via unbound copy of base64 decoded string\u003cbr\u003e\u003cbr\u003eThe `b64decoder` string is sized dynamically, but it is then copied to the `Buffer` stack variable one character at the time at [0], and there\u0027s 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.\u003c/div\u003e"
            }
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          "value": "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. \n\n\n\nMost 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.\u00a0\u00a0\n\n\n\n#### Stack-overflow via unbound copy of base64 decoded string\n\nThe `b64decoder` string is sized dynamically, but it is then copied to the `Buffer` stack variable one character at the time at [0], and there\u0027s 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."
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              "lang": "en",
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        },
        {
          "capecId": "CAPEC-242",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-242 Code Injection"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 10,
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            "confidentialityImpact": "HIGH",
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            "scope": "CHANGED",
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            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
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      ],
      "problemTypes": [
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-15T07:45:15.385Z",
        "orgId": "0df08a0e-a200-4957-9bb0-084f562506f9",
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      },
      "references": [
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          "tags": [
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          "url": "https://www.geovision.com.tw/cyber_security.php"
        },
        {
          "url": "https://https://talosintelligence.com/vulnerability_reports/"
        }
      ],
      "solutions": [
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        }
      ],
      "source": {
        "advisory": "TALOS-2026-2333",
        "discovery": "EXTERNAL"
      },
      "timeline": [
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          "lang": "en",
          "time": "2026-02-17T01:32:00.000Z",
          "value": "Initial Vendor Contact"
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  "cveMetadata": {
    "assignerOrgId": "0df08a0e-a200-4957-9bb0-084f562506f9",
    "assignerShortName": "GV",
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    "datePublished": "2026-05-04T00:47:00.507Z",
    "dateReserved": "2026-04-26T23:39:08.350Z",
    "dateUpdated": "2026-05-15T07:45:15.385Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-8WJC-Q3QJ-WC8J

Stack-overflow via unbound copy of base64 decoded string

CVE-2026-42369 (GCVE-0-2026-42369)

Tags

Sightings

Nomenclature