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Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: A stack overflow in GeoVision GV-VMS V20's WebCam Server. π **Consequences**: Attackers can achieve **full code execution** with **SYSTEM privileges** on the target machine.β¦
π‘οΈ **Root Cause**: **CWE-787** (Out-of-bounds Write). π The `b64decoder` dynamically allocates memory but copies data into a fixed 256-byte stack buffer **without boundary checks**.β¦
π» **Privileges**: **SYSTEM** level access. π **Data**: Full control over the machine. π Attackers can run arbitrary commands, install backdoors, or pivot to other network assets.β¦
π **Auth Bypass**: Most features require login, BUT the `gvapi` endpoint uses its own auth via `HTTP Authorization` header. π Supports Basic/Digest. πͺ **Threshold**: Low.β¦
π **Self-Check**: 1. Check if GV-VMS V20 is installed. 2. Verify if **WebCam Server** is enabled. 3. Scan for the `gvapi` endpoint. 4. Test if it accepts HTTP requests without standard web login.β¦
π οΈ **Official Fix**: The vendor advisory link is provided (`geovision.com.tw`). π Published: 2026-05-04. β³ **Status**: Check the vendor site for a patch.β¦
π§ **Workaround**: **Disable the WebCam Server** feature immediately if not strictly needed. π« If required, restrict network access to the `gvapi` endpoint via firewall rules (only allow trusted IPs).β¦