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Classic Buffer OverflowWeakness · CWE-120

CVE-2026-57277

HIGH · 8.3 CVSS v3.1 Published 2026-07-02
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
90/100
Remediation priority · Urgent
Remotely reachable No privileges 8 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Stack-based buffer overflow in GeoWebPlayer's websocket server handle_connection_info function. The function copies attacker-controlled JSON 'key' field data into fixed-size buffers using unsafe manual byte-by-byte loops without length validation. A local attacker can send oversized JSON key values to overflow destination buffers.

MitigationReplace unsafe string copy operations with bounds-checked functions (snprintf, strncpy, or safe string libraries) and add explicit length validation on JSON input fields before copying into fixed-size buffers. Restrict localhost websocket access as interim mitigation.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify GeoWebPlayer installation and version
    Locate GeoWebPlayer installation directory and check version information in application metadata, About dialog, or version file (e.g., version.txt, geowebplayer.ini). Compare against any known version ranges.
    Affected if GeoWebPlayer is installed and version falls within the affected range (if known) or is an unpatched version.
  2. Verify websocket server component is enabled
    Check GeoWebPlayer configuration files or service settings for websocket server settings. Look for entries like 'websocket', 'server', 'enable' in config files (e.g., geowebplayer.conf, settings.xml) or check if websocket service process is running.
    Affected if Websocket server is enabled and running, exposing the handle_connection_info function.
  3. Check network exposure of websocket port
    Identify the websocket server port (typically in configuration or via netstat/ss commands searching for LISTEN sockets related to GeoWebPlayer). Verify if the port is bound to non-localhost interfaces or exposed to untrusted networks.
    Affected if Websocket port is bound to 0.0.0.0 or an accessible network interface, allowing remote/local attackers to send malicious JSON.
  4. Inspect websocket endpoint accessibility
    If configuration files are accessible, check for access control settings on websocket endpoints. Look for 'localhost_only', 'bind_address', or 'allow_external' configuration flags.
    Affected if Websocket server permits connections from non-localhost sources or lacks proper access restrictions.
  5. Confirm handle_connection_info function is present
    If application binaries or source code are available, verify the handle_connection_info function exists in the websocket server component. For binaries, use strings, objdump, or a disassembler; for source, grep for the function name.
    Affected if The vulnerable handle_connection_info function is present in the deployed websocket server component.

The environment is affected if GeoWebPlayer with a websocket server containing the handle_connection_info function is installed, the websocket service is enabled, and it is accessible to potential attackers (not restricted to localhost only).

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Replace unsafe string copy operations with bounds-checked functions (snprintf, strncpy, or safe string libraries) and add explicit length validation on JSON input fields before copying into fixed-size buffers. Restrict localhost websocket access as interim mitigation.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-57277 in production — separate from our analysis above.

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What this is

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What belongs here
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