CVE-2025-64666

Dec. 9, 2025, 6:36 p.m.

7.5
High

Description

Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Product(s) Impacted

Product Versions
exchange_server
  • *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-20
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666

Tags

CWE-20
secure@microsoft.com
2025-12-09
CVE-2025-64666

CVSS Score

7.5 / 10

CVSS Data - 3.1

  • Attack Vector: NETWORK
  • Attack Complexity: HIGH
  • Privileges Required: LOW
  • Scope: UNCHANGED
  • Confidentiality Impact: HIGH
  • Integrity Impact: HIGH
  • Availability Impact: HIGH

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

    View Vector String

Timeline

Published: Dec. 9, 2025, 6:16 p.m.
Last Modified: Dec. 9, 2025, 6:36 p.m.

Status : Undergoing Analysis

CVE is currently being analyzed by NVD staff, this process results in association of reference link tags, CVSS scores, CWE association, and CPE applicability statements.

More info

Source

secure@microsoft.com

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.