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"dateReserved": "2026-04-28T23:12:55.269Z",
"datePublished": "2026-05-04T00:47:36.651Z",
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"title": "GeoVision GV-VMS V20 WebCam Server Login stack overflow vulnerability",
"datePublic": "2026-04-27T00:00:00.000Z",
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"product": "GV-VMS V20.0.2",
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"version": "20.0.2"
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"value": "A stack overflow vulnerability exists in the WebCam Server Login functionality of GeoVision GV-VMS V20 20.0.2. A specially crafted HTTP request can lead to an arbitrary code execution. An attacker can make an unauthenticated HTTP request to trigger this vulnerability.\n\n#### Stack-overflow via unconstrained sscanf\n\nThe call to `sscanf` at [1] to split the `Buffer` variable into the `username` and `password` variables doesn't limit the size of the extracted content to match the destination buffers' sizes. In this case, if either the username or password decoded from the authorization string exceeds `40` characters (the size the stack variables `username` and `password`) then a stack overflow will occur. \n\n\n\nThe data is controlled by an attacker, but sronger constraints (e.g. no null bytes) may make exploitation harder. A successful attack could lead to full code execution as SYSTEM on the machine running the service.",
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#### Stack-overflow via unconstrained sscanf
The call to `sscanf` at [1] to split the `Buffer` variable into the `username` and `password` variables doesn't limit the size of the extracted content to match the destination buffers' sizes. In this case, if either the username or password decoded from the authorization string exceeds `40` characters (the size the stack variables `username` and `password`) then a stack overflow will occur. \n
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The data is controlled by an attacker, but sronger constraints (e.g. no null bytes) may make exploitation harder. A successful attack could lead to full code execution as SYSTEM on the machine running the service.
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"references": [
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"url": "https://www.geovision.com.tw/cyber_security.php",
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"vendor-advisory"
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"lang": "en",
"value": "GeoVision GV-VMS version V20.1.0 has patched the reported vulnerability. \n\n\nUser is recommended to download the update from GeoVision's offical website (https://www.geovision.com.tw/download/product/GV-VMS%20V20)\n\nor contact GeoVision Support team\n\n\n\n\nFor 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. \n\nhttps://php.gvdip.com/phpbb3/viewtopic.php?t=3326",
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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
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