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Web Presenter Hd FirmwareOperating system · Blackmagicdesign

CVE-2025-57432

CRITICAL · 9.8 CVSS v3.1 Published 2025-09-22
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click

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
Blackmagic Web Presenter version 3.3 exposes a Telnet service on port 9977 that accepts unauthenticated commands. This service allows remote attackers to manipulate stream settings, including changing video modes and possibly altering device functionality. No credentials or authentication mechanisms are required to interact with the Telnet interface.

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

Blackmagic Web Presenter version 3.3 runs an unauthenticated Telnet service on port 9977 that accepts commands without any authentication. This allows remote attackers to manipulate stream settings, change video modes, and alter device functionality by sending raw Telnet commands to the exposed service.

MitigationRestrict network access to the Telnet port (9977) via firewall rules or network segmentation until a patched firmware version is available; if possible, disable the Telnet service through device configuration or contact Blackmagic for an emergency firmware update.

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

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Web Presenter Hd FirmwareOperating system
Affected:= 3.3
Web Presenter 4k FirmwareOperating system
Affected:= 3.3

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
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 Blackmagic Web Presenter device on network
    Scan your network for devices responding to HTTP on port 80/443 or check your network inventory for Blackmagic Web Presenter devices. Access the device's web interface to confirm the model.
    Affected if Device is a Blackmagic Web Presenter HD or 4K on your network
  2. Check device firmware version
    Log into the device web interface and navigate to the Settings or About page to view the installed firmware version. Alternatively, check the device dashboard for the firmware version displayed.
    Affected if Firmware version is exactly 3.3
  3. Verify Telnet port 9977 is accessible
    Use a network scanner (such as nmap) to check if port 9977 is open on the device: nmap -p 9977 <device-ip>. Also verify if the port is exposed to untrusted networks.
    Affected if Port 9977 is open and reachable from your network segment
  4. Confirm Telnet service accepts unauthenticated commands
    Connect to the service using telnet <device-ip> 9977 and observe if you receive a prompt or can execute commands without providing any credentials.
    Affected if Telnet connection succeeds and accepts commands without authentication

You are affected if you have a Blackmagic Web Presenter HD or 4K running firmware version 3.3 with port 9977 exposed on your network.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Restrict network access to the Telnet port (9977) via firewall rules or network segmentation until a patched firmware version is available; if possible, disable the Telnet service through device configuration or contact Blackmagic for an emergency firmware update.

Recommended fix Moderate confidence

Latest available Web Presenter firmware (check blackmagicdesign.com for version number)

  1. Check Blackmagic Design's support website (www.blackmagicdesign.com) for the latest Web Presenter firmware version
  2. Download and install the latest firmware update for Web Presenter HD or Web Presenter 4K
  3. After upgrading, verify that the Telnet service on port 9977 now requires authentication or is disabled by default
  4. If Telnet remains exposed, consider blocking port 9977 at the network firewall level as an additional mitigation
Caveat Review release notes for any configuration changes or feature modifications in the new firmware version

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Web Presenter Hd Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,180
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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-2025-57432 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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  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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