Auth bypass in Blackmagicdesign Web Presenter 4k
CVE-2025-57432
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.blackmagicdesign.com/ (Product)
- github.com/shiky8/my--cve-vulnerability-research/tree/main/CVE-2025-57432 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-57432?
- CVE-2025-57432 is a critical-severity vulnerability in Blackmagicdesign Web Presenter 4k, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-09-22.
- How severe is CVE-2025-57432?
- Critical severity. CVSS v3 base score is 9.8 out of 10.