CVE-2026-57277
Deferred Deferred - Pending Action

Buffer Overflow in GeoWebPlayer Websocket Server

Publication date: 2026-07-02

Last updated on: 2026-07-02

Assigner: 0df08a0e-a200-4957-9bb0-084f562506f9

Description
GeoWebPlayer (also called "Web Plugin" in the GV-VMS documentation and "WS Player" for VMS-Cloud) is an addon that can be installed with various GeoVision software (GV-VMS, GV-Cloud, ...). It creates a websocket server that expands the capabilities of the various web-interfaces provided by the GeoVision software and may be necessary for them to function properly. The Websocket server can accept various commands coming from localhost. One of them, `connectionInfo` is meant to provide the necessary details to connect to a camera. The handler associated with this command that we call`handle_connection_info` contains multiple instances of string copy that can overflow. The function `handle_connect_info` copies attacker-controlled JSON strings into fixed-size buffers using manual byte-by-byte loops that do not enforce length limits. #### Buffer Overflow in key field

CVSS Scores

EPSS Scores

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Meta Information

Published
2026-07-02
Last Modified
2026-07-02
Generated
2026-07-22
AI Q&A
2026-07-02
EPSS Evaluated
2026-07-21
NVD
CVE-2026-57277
EUVD
EUVD-2026-41239

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
geovision geowebplayer *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Attack-Flow Graph

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Executive Summary

This vulnerability exists in GeoWebPlayer, an addon for GeoVision software, which creates a websocket server to enhance web interface capabilities. The server accepts commands from localhost, including one called `connectionInfo` that provides camera connection details. The handler for this command, `handle_connection_info`, improperly copies attacker-controlled JSON strings into fixed-size buffers without enforcing length limits, leading to multiple instances of buffer overflow.

Detection Guidance

This vulnerability exists in the GeoWebPlayer websocket server, which listens for commands on localhost. Detection involves monitoring or testing the websocket server for unsafe handling of the `connectionInfo` command, particularly by sending crafted JSON payloads with oversized fields to check for buffer overflow behavior.

Since the vulnerable handler accepts JSON commands over a websocket server running locally, detection can be performed by attempting to connect to the websocket server on the local machine and sending a JSON command with an excessively long string in the key fields (such as the 'connectionInfo' command) to see if the server crashes or behaves unexpectedly.

Specific commands to detect this vulnerability are not provided in the available resources. However, a general approach would be to use websocket client tools (e.g., `websocat`, `wscat`, or custom scripts) to connect to the GeoWebPlayer websocket server on localhost and send crafted JSON payloads with oversized fields to test for buffer overflow.

Network detection could also involve monitoring for unusual websocket traffic or crashes related to the GeoWebPlayer service, but no explicit network detection commands or signatures are provided.

Impact Analysis

The buffer overflow vulnerability in the `handle_connection_info` function can lead to serious impacts including complete compromise of confidentiality, integrity, and availability of the affected system. Given the CVSS score of 8.3 with high impact on confidentiality, integrity, and availability, an attacker could potentially execute arbitrary code, cause denial of service, or gain unauthorized access.

Compliance Impact

The vulnerability in GeoWebPlayer's websocket server allows for buffer overflow attacks that can lead to arbitrary code execution, impacting confidentiality, integrity, and availability of the system.

Such impacts on confidentiality and integrity could potentially lead to non-compliance with standards and regulations like GDPR and HIPAA, which require protection of sensitive data and system integrity.

However, the provided information does not explicitly describe the direct effects of this vulnerability on compliance with these regulations.

Mitigation Strategies

An immediate step to mitigate this vulnerability is to apply the patch released by the vendor on April 28, 2026.

Since the vulnerability involves a buffer overflow in the GeoWebPlayer Websocket Server, updating to a fixed version will prevent exploitation.

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