CVE-2026-57878 Overview
CVE-2026-57878 is an unauthenticated stack-based buffer overflow in the thttpd web server component shipped with GeoVision GV-LPC2011 and GV-LPC2211 license plate capture devices running firmware V1.12 and earlier. The flaw resides in the handling of web request parameters on a specific request path, where insufficient bounds checking allows attacker-controlled input to overwrite the stack. A remote attacker can send a crafted HTTP request with overly long parameter data to corrupt memory, crash the service, or potentially execute arbitrary code on the device.
Critical Impact
Unauthenticated remote attackers can trigger memory corruption over the network and may achieve arbitrary code execution on affected GeoVision license plate capture devices.
Affected Products
- GeoVision GV-LPC2011 running firmware V1.12 and earlier
- GeoVision GV-LPC2211 running firmware V1.12 and earlier
- The embedded thttpd web server on these devices
Discovery Timeline
- 2026-06-26 - CVE-2026-57878 published to the National Vulnerability Database (NVD)
- 2026-06-26 - Last updated in NVD database
Technical Details for CVE-2026-57878
Vulnerability Analysis
The vulnerability is a stack-based buffer overflow [CWE-121] in thttpd, a lightweight HTTP daemon embedded in GeoVision GV-LPC2011 and GV-LPC2211 firmware. When the server parses parameters from a specific request path, it copies attacker-supplied data into a fixed-size stack buffer without validating the input length. Sending an overly long value overwrites adjacent stack memory, including saved return addresses and frame pointers.
Because the affected code path does not require authentication, any network-reachable attacker can trigger the condition. Successful exploitation can lead to denial of service through process crash, or arbitrary code execution if the attacker overwrites control-flow data with a valid target address. Embedded appliances of this class typically run services as a privileged user, which increases the impact on the underlying device.
Root Cause
The root cause is missing bounds checking on request parameters processed by thttpd. The receiving function uses an unbounded copy operation into a fixed-length stack buffer instead of a length-limited routine, allowing input larger than the buffer to corrupt the call frame.
Attack Vector
An attacker sends a single crafted HTTP request over the network to the vulnerable endpoint on the device. The request contains an oversized parameter value that overflows the stack buffer during parsing. No credentials, prior access, or user interaction are required. Because the devices are commonly exposed on management networks or accessible from adjacent segments, exploitation can be performed remotely without authentication.
A verified proof of concept is not available in public sources at the time of publication. See the GeoVision Cyber Security Resource for vendor guidance and technical details.
Detection Methods for CVE-2026-57878
Indicators of Compromise
- HTTP requests to the device web interface containing unusually long query string or POST parameter values, particularly repeating byte patterns or shellcode-like payloads.
- Unexpected restarts or crashes of the thttpd process on GV-LPC2011 or GV-LPC2211 devices.
- Outbound connections from the device to unfamiliar hosts, which may indicate post-exploitation activity.
Detection Strategies
- Deploy network intrusion detection signatures that flag HTTP requests to the affected devices with parameter lengths exceeding reasonable thresholds (for example, more than 1024 bytes).
- Inspect web server logs on the appliance and upstream reverse proxies for repeated malformed requests to the same endpoint from a single source.
- Baseline normal traffic patterns to the license plate capture devices and alert on deviations in request size, frequency, or source.
Monitoring Recommendations
- Forward device syslog and any available application logs to a centralized log platform for correlation with network telemetry.
- Monitor for process crash indicators and unexpected reboots on affected devices.
- Track connections from license plate capture devices to non-management destinations, which are unusual in normal operation.
How to Mitigate CVE-2026-57878
Immediate Actions Required
- Restrict network access to the web interface of GV-LPC2011 and GV-LPC2211 devices to trusted management subnets using firewall rules or ACLs.
- Remove any exposure of these devices to the public internet.
- Inventory all GeoVision license plate capture devices and identify units running firmware V1.12 or earlier.
- Apply the vendor firmware update as soon as it is released and validated.
Patch Information
At the time of publication, refer to the GeoVision Cyber Security Resource for the current advisory and firmware update availability for GV-LPC2011 and GV-LPC2211. Devices running firmware V1.12 and earlier should be upgraded to a fixed release when provided by the vendor.
Workarounds
- Place affected devices behind a reverse proxy or firewall that enforces strict request size limits and drops malformed HTTP requests.
- Disable remote administrative access to the device where operationally feasible and use a jump host on the management VLAN instead.
- Segment license plate capture devices onto a dedicated VLAN with egress filtering to limit lateral movement in the event of compromise.
# Example: restrict access to the device web interface to a management subnet
iptables -A FORWARD -p tcp -d <device_ip> --dport 80 -s 10.10.20.0/24 -j ACCEPT
iptables -A FORWARD -p tcp -d <device_ip> --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
