Vulnerability Report

CVE-2026-20927

Title: Race condition to DoS in Windows SMB Server

Arbitrary File Access

Proof Of Concept

No public PoC currently indexed for CVE-2026-20927.

CWE Category CWE-362

Published Date Jan 13, 2026

Modified Date Jan 16, 2026

Exploit Status Not Found

Score 5.3 CVSS v3.1

Exploit Probability (EPSS)

0.89%

Vulnerability Summary

CVE-2026-20927: Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to deny service over a network.

Impacted Vendors

microsoft 14

Reference Links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20927

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.3

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-20927 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

January 16, 2026 MODIFIED

Vulnerability data updated via NVD.

January 16, 2026 MODIFIED

Vulnerability data updated via NVD.

January 14, 2026 MODIFIED

Vulnerability data updated via NVD.

January 13, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.