CVE-2026-57273 Overview
CVE-2026-57273 is a buffer overflow vulnerability [CWE-120] in GeoVision GeoWebPlayer, also referred to as Web Plugin in GV-VMS documentation and WS Player in VMS-Cloud. GeoWebPlayer runs a local WebSocket server that expands the capabilities of GeoVision web interfaces including GV-VMS and GV-Cloud. The handle_connect_info handler processes the connectionInfo command and copies attacker-controlled JSON strings into fixed-size buffers using manual byte-by-byte loops without length enforcement. Successful exploitation can lead to memory corruption and code execution in the context of the plugin process.
Critical Impact
A network-reachable attacker who lures a user to a malicious page can trigger buffer overflows in the localhost WebSocket server, resulting in high impact to confidentiality, integrity, and availability.
Affected Products
- GeoVision GeoWebPlayer (Web Plugin) bundled with GV-VMS
- GeoVision WS Player component used with GV-Cloud / VMS-Cloud
- GeoVision software products distributing the GeoWebPlayer addon
Discovery Timeline
- 2026-07-02 - CVE-2026-57273 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-57273
Vulnerability Analysis
GeoWebPlayer creates a WebSocket server bound to localhost that accepts commands from browser contexts running GeoVision web interfaces. The connectionInfo command is intended to supply parameters for connecting to a camera, including credentials and endpoint details. The handler routine, referred to as handle_connect_info, parses incoming JSON and copies string fields into fixed-size stack or heap buffers.
The copy operation uses manual byte-by-byte loops rather than bounded string functions. These loops terminate on a source delimiter rather than a destination capacity check. When the JSON username field or related string fields exceed the destination buffer size, adjacent memory is overwritten. Attackers can craft oversized values to corrupt saved return addresses, function pointers, or heap metadata.
Exploitation requires a user to visit a malicious page that establishes a WebSocket connection to the local GeoWebPlayer service. This user-interaction requirement is reflected in the vector, but the impact remains high across confidentiality, integrity, and availability because the process handles camera credentials and executes with the user's privileges.
Root Cause
The root cause is missing bounds validation on inbound JSON string fields inside handle_connect_info. The function does not compare source length against destination capacity before copying, satisfying the classic definition of [CWE-120] buffer copy without checking size of input.
Attack Vector
An attacker hosts a web page that opens a WebSocket to the local GeoWebPlayer listener. The page sends a connectionInfo message containing an overlong username value with no accompanying key structure that would otherwise limit parsing. The oversized value overflows the destination buffer inside handle_connect_info, corrupting adjacent memory and enabling potential code execution.
Refer to the Talos Intelligence Vulnerability Report for the full technical write-up, including field layouts and proof-of-concept details.
Detection Methods for CVE-2026-57273
Indicators of Compromise
- Unexpected crashes or restarts of the GeoWebPlayer, Web Plugin, or WS Player process on endpoints running GeoVision software.
- Local WebSocket connections to GeoWebPlayer originating from browser tabs on non-GeoVision domains.
- Anomalous child processes spawned by GeoWebPlayer, such as command shells or scripting hosts.
Detection Strategies
- Monitor process integrity for GeoWebPlayer binaries and alert on abnormal termination, exception codes, or WER crash dumps referencing string copy routines.
- Inspect endpoint telemetry for outbound browser connections that also open a loopback WebSocket to the GeoWebPlayer listener port.
- Hunt for post-exploitation behavior including credential access, LSASS interaction, or persistence mechanisms following GeoWebPlayer activity.
Monitoring Recommendations
- Enable EDR memory protection and exploit mitigations for the GeoWebPlayer process and log Data Execution Prevention or Control Flow Guard violations.
- Collect and centralize crash artifacts from workstations running GV-VMS or GV-Cloud clients for review.
- Baseline normal WebSocket traffic to the GeoWebPlayer localhost port and alert on connections from unexpected browser origins.
How to Mitigate CVE-2026-57273
Immediate Actions Required
- Inventory endpoints with GeoVision GV-VMS, GV-Cloud, or VMS-Cloud clients and confirm whether GeoWebPlayer, Web Plugin, or WS Player is installed.
- Apply the vendor-supplied update once GeoVision publishes a fix referenced on the GeoVision Cyber Security page.
- Restrict browser access to untrusted sites on workstations that require GeoWebPlayer for camera management.
Patch Information
Monitor the GeoVision Cyber Security Overview and the Talos Intelligence Vulnerability Report for released fixed versions and advisories. Deploy the patched GeoWebPlayer build across all affected endpoints once available and validate the version after installation.
Workarounds
- Uninstall or disable GeoWebPlayer on hosts that do not require the browser-based camera interface until a patched version is deployed.
- Block the GeoWebPlayer WebSocket listener from accepting connections when the GeoVision web console is not in active use, for example by stopping the associated service.
- Enforce browser isolation or a dedicated management browser profile for GeoVision web interfaces to reduce exposure to malicious sites.
# Windows example: stop and disable the GeoWebPlayer service until patched
sc stop GeoWebPlayer
sc config GeoWebPlayer start= disabled
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
