CVE-2026-12485 Overview
CVE-2026-12485 is a stack-based buffer overflow [CWE-121] affecting the GeoVision GV-I/O Box 4E, a smart embedded device providing 4 inputs and 4 relay outputs over Ethernet and RS-485. The vulnerability resides in the DVRSearch service, which listens for UDP messages on port 10001 by default. Any unauthenticated attacker on the network can send a crafted UDP packet to trigger memory corruption. The flaw stems from an unchecked memcpy operation that copies attacker-influenced IP address data into a fixed-size stack buffer.
Critical Impact
Unauthenticated remote attackers on the network can corrupt stack memory in the DVRSearch service, leading to potential arbitrary code execution on the embedded device with full impact to confidentiality, integrity, and availability.
Affected Products
- GeoVision GV-I/O Box 4E embedded controller
- DVRSearch service listening on UDP port 10001
- Devices using the affected network configuration handling routine
Discovery Timeline
- 2026-06-24 - CVE-2026-12485 published to the National Vulnerability Database (NVD)
- 2026-06-25 - Last updated in NVD database
Technical Details for CVE-2026-12485
Vulnerability Analysis
The DVRSearch service runs by default on the GV-I/O Box 4E and accepts UDP datagrams on port 10001. The service reads up to 1460 bytes from incoming messages into a local buffer and stores a pointer to that buffer in a global variable. The service then processes the request and constructs a reply that incorporates fields from the device's network configuration.
The vulnerable code path computes the length of the configured IP address string with strlen(g_network_config->ip_addr) and copies that many bytes into reply_buf[36] using memcpy. Because the source string length is not validated against the destination buffer size, an attacker who can influence g_network_config->ip_addr can write past the bounds of reply_buf, corrupting the stack frame including the saved return address.
Root Cause
The root cause is missing bounds validation on a length value derived from attacker-influenced configuration data before invoking memcpy into a fixed-size stack buffer. The implementation trusts that ip_addr will fit within the destination region, but no length check or maximum-copy guard is present. This is a textbook stack-based buffer overflow [CWE-121].
Attack Vector
The attack is purely network-based and requires no authentication or user interaction. An attacker sends a crafted UDP packet to port 10001 on a reachable GV-I/O Box 4E. The processing path causes the oversized IP field to be copied into the stack buffer, overwriting saved registers and the return address. With reliable control of the overwritten memory, an attacker can redirect execution and potentially achieve remote code execution on the embedded device. The scope-changed CVSS vector indicates impact can extend beyond the vulnerable component to downstream control surfaces such as the connected relay outputs.
No verified public proof-of-concept code is available. Refer to the Talos Intelligence Vulnerability Report for additional technical details.
Detection Methods for CVE-2026-12485
Indicators of Compromise
- Unexpected inbound UDP traffic to port 10001 on GV-I/O Box 4E devices from untrusted sources
- Anomalously large or malformed UDP datagrams targeting the DVRSearch service
- Unexplained reboots, service crashes, or relay state changes on affected IoT devices
- Outbound connections initiated from the device to unfamiliar external hosts after receiving DVRSearch traffic
Detection Strategies
- Deploy network IDS signatures that flag oversized or malformed UDP packets directed at port 10001
- Baseline normal DVRSearch query patterns and alert on deviations in size, frequency, or source
- Monitor switch and firewall logs for scanning behavior across UDP/10001 within OT and IoT segments
Monitoring Recommendations
- Forward firewall, switch, and IoT gateway telemetry to a centralized SIEM for correlation
- Track device availability and unexpected restarts of GV-I/O Box 4E units as potential exploitation signals
- Inventory all GeoVision devices and continuously verify which units expose UDP 10001 to the broader network
How to Mitigate CVE-2026-12485
Immediate Actions Required
- Restrict UDP port 10001 access to trusted management hosts only using ACLs or host firewalls
- Place GV-I/O Box 4E devices on isolated VLANs separated from general user and internet-facing networks
- Audit exposed GeoVision devices and remove any units reachable from untrusted networks until patched
- Consult the GeoVision Cyber Security Overview for vendor advisories and firmware updates
Patch Information
At the time of publication, no vendor patch reference is listed in the NVD entry. Administrators should monitor the GeoVision Cyber Security Overview and the Talos Intelligence Vulnerability Report for firmware updates addressing CVE-2026-12485 and apply them as soon as they become available.
Workarounds
- Block all inbound UDP traffic to port 10001 at perimeter and segmentation firewalls
- Disable the DVRSearch service on devices where discovery functionality is not required
- Implement strict allowlisting so only authorized management workstations can reach the device's UDP listener
# Example: restrict UDP/10001 to a single management host on Linux iptables
iptables -A FORWARD -p udp --dport 10001 -s 10.0.0.10 -d 10.0.50.0/24 -j ACCEPT
iptables -A FORWARD -p udp --dport 10001 -d 10.0.50.0/24 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
