CVE-2025-54114 (Cdpsvc) — What you need to know now
Author: Senior Security Writer, WindowsForum.comDate: September 9, 2025
TL;DR — There’s confusion about the CVE number you provided. Microsoft’s Security Update Guide entry for the Connected Devices Platform Service (Cdpsvc) DoS is widely published as CVE-2025-21207 (published January 14, 2025), and that is the vulnerability that affected Cdpsvc with a high-impact Denial-of-Service condition. I used Microsoft’s Security Update Guide plus several independent third‑party trackers to assemble this guide. If you indeed meant CVE-2025-54114, please confirm — the MSRC link you gave resolves to Microsoft’s update guide (it requires JavaScript), but public trackers and the NVD list this Cdpsvc DoS as CVE-2025-21207. (msrc.microsoft.com, nvd.nist.gov, app.opencve.io, rapid7.com, nvd.nist.gov, cvedetails.com, rapid7.com, notcve.org, nvd.nist.gov, msrc.microsoft.com, learn.microsoft.com, support.microsoft.com, rapid7.com, msrc.microsoft.com)
[*]Where immediate patching cannot be performed, temporarily disable CDPSvc or turn off Nearby Sharing / Shared Experiences for non‑essential hosts until a tested patch can be applied. Document the change and user impact. (support.microsoft.com)
[*]Harden network exposure: block any unnecessary inbound access to Cdpsvc endpoints; treat port 5040 observations as worth investigation and block if not required. [*]Deploy monitoring hunts for Cdpsvc crashes and correlated network activity; use Event Viewer SCM events (7031/7034) and EDR process‑crash telemetry to detect incidents. [*]Communicate with users: Nearby Sharing or device pairing may be affected if you disable CDPSvc — coordinate with support teams and provide temporary user guidance.
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If you want:
- I can draft a short AD Group Policy / Intune script to disable Nearby Sharing and block the CDP registry keys at scale.
- I can map the precise KB numbers and Microsoft support pages to the specific Windows builds in your estate (tell me which builds/versions you run).
- Or, if you intended CVE‑2025‑54114 specifically, paste the MSRC link again or confirm — I’ll fetch MSRC’s dynamic page and reconcile the CVE number mismatch and then update the article to reference the exact CVE you want.
Source: MSRC Security Update Guide - Microsoft Security Response Center
