CVE-2026-57877 Overview
CVE-2026-57877 is an unauthenticated format string vulnerability [CWE-134] in the vlsvr service of GeoVision GV-LPC2011 and GV-LPC2211 license plate capture devices running firmware V1.12 and earlier. The flaw resides in the login processing path, where externally controlled input is passed directly into a log message formatting function. A remote attacker can send crafted login data to trigger the vulnerability without prior authentication. Successful exploitation can lead to information disclosure, memory corruption, or denial of service on the affected device.
Critical Impact
Remote unauthenticated attackers can send crafted login payloads to vlsvr to disclose memory contents, corrupt process state, or crash the service on GeoVision GV-LPC2011 and GV-LPC2211 devices.
Affected Products
- GeoVision GV-LPC2011 firmware V1.12 and earlier
- GeoVision GV-LPC2211 firmware V1.12 and earlier
- vlsvr login service component on the above devices
Discovery Timeline
- 2026-06-26 - CVE-2026-57877 published to NVD
- 2026-06-26 - Last updated in NVD database
Technical Details for CVE-2026-57877
Vulnerability Analysis
The vulnerability exists in vlsvr, the service that handles login requests on GeoVision GV-LPC2011 and GV-LPC2211 license plate capture cameras. During login processing, attacker-controlled input is passed as the format string argument to a logging routine rather than as a data argument. This classic format string flaw allows conversion specifiers such as %x, %s, and %n supplied by the attacker to be interpreted by the logger.
Because the login endpoint is reachable before authentication, an attacker only needs network access to the device. Reading format specifiers can leak stack values, pointers, and potentially credentials or session material stored in memory. Writing specifiers such as %n can corrupt memory locations and destabilize the service.
The issue is tracked under CWE-134: Use of Externally-Controlled Format String. GeoVision documents its remediation posture on the GeoVision Cyber Security Resource page.
Root Cause
The root cause is improper handling of externally controlled input during log message formatting. The login handler passes user-supplied fields directly into a printf-family or equivalent logging call without a fixed format string, so any conversion specifier in the input is honored by the formatter.
Attack Vector
Exploitation is remote and network-based over the service port exposed by vlsvr. The attacker submits a login request containing format specifiers in a field consumed by the vulnerable logging path. No credentials or user interaction are required. Depending on payload construction, the outcome ranges from information disclosure to memory corruption or a service crash producing denial of service.
No public proof-of-concept code has been published. The vulnerability mechanism follows the standard format string exploitation pattern against embedded Linux services and should be described in prose rather than reproduced here.
Detection Methods for CVE-2026-57877
Indicators of Compromise
- Login requests to vlsvr containing format specifiers such as %x, %s, %p, or %n in username, password, or related fields
- Unexpected restarts, crashes, or watchdog resets of the vlsvr process on GV-LPC2011 or GV-LPC2211 devices
- Repeated failed or malformed login attempts from a single source targeting the login service port
Detection Strategies
- Deploy network signatures on IDS/IPS to flag login payloads to GeoVision devices that contain % conversion specifiers in credential fields
- Correlate device syslog entries showing malformed login attempts with process restarts of vlsvr
- Baseline expected login sources and alert on requests originating from unmanaged networks or external addresses
Monitoring Recommendations
- Forward device syslog to a central log platform and alert on vlsvr crash, restart, or segmentation fault messages
- Monitor network flows to and from GeoVision GV-LPC2011 and GV-LPC2211 devices for unexpected clients contacting the login service
- Track firmware version inventory across GeoVision devices to identify systems still running V1.12 or earlier
How to Mitigate CVE-2026-57877
Immediate Actions Required
- Restrict network access to vlsvr on GV-LPC2011 and GV-LPC2211 devices to trusted management networks only
- Inventory GeoVision license plate capture devices and identify firmware versions at or below V1.12
- Apply vendor-provided firmware updates as soon as GeoVision publishes fixed builds on the GeoVision Cyber Security Resource page
Patch Information
GeoVision publishes firmware updates and security advisories on the GeoVision Cyber Security Resource portal. Administrators should consult the vendor page for the corrected firmware version above V1.12 and follow the documented upgrade procedure for GV-LPC2011 and GV-LPC2211 hardware.
Workarounds
- Place affected devices behind a firewall that only permits management traffic from authorized administrative hosts
- Segment license plate capture cameras onto an isolated VLAN with no direct internet exposure
- Disable remote access to the login service from untrusted interfaces where the device configuration permits
# Example firewall restriction limiting access to the vlsvr login port
# Replace <MGMT_CIDR>, <DEVICE_IP>, and <VLSVR_PORT> with site-specific values
iptables -A FORWARD -s <MGMT_CIDR> -d <DEVICE_IP> -p tcp --dport <VLSVR_PORT> -j ACCEPT
iptables -A FORWARD -d <DEVICE_IP> -p tcp --dport <VLSVR_PORT> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
