What is the CVSS score of CVE-2026-20864?

CVE-2026-20864 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Connected Devices Platform Service are affected by CVE-2026-20864?

CVE-2026-20864 presents notable security risk, a heap-based buffer overflow vulnerability rated CVSS 7.8.. A patch is available.

How to fix or mitigate CVE-2026-20864?

Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.

Connected Devices Platform Service CVE-2026-20864

HIGH

Heap-based Buffer Overflow (CWE-122)

2026-01-13 secure@microsoft.com

Buffer Overflow Heap Overflow

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 13, 2026 - 18:16 nvd

HIGH 7.8

DescriptionCVE.org

Heap-based buffer overflow in Connected Devices Platform Service (Cdpsvc) allows an authorized attacker to elevate privileges locally.

AnalysisAI

Windows Server and Windows 10/11 Connected Devices Platform Service (Cdpsvc) contains a heap buffer overflow that allows authenticated local users to escalate privileges to system level. The vulnerability requires low complexity exploitation with no user interaction, affecting multiple recent Windows versions including Server 2022, Windows 10 21h2, and Windows 11 23h2. No patch is currently available for this high-severity flaw.

Technical ContextAI

Classified as CWE-122 (Heap-based Buffer Overflow). Affects the Connected Devices Platform component of Windows 10 1809. Heap-based buffer overflow in Connected Devices Platform Service (Cdpsvc) allows an authorized attacker to elevate privileges locally.