CVE-2025-64666
Analyzed Analyzed - Analysis Complete
BaseFortify

Publication date: 2025-12-09

Last updated on: 2026-06-15

Assigner: Microsoft Corporation

Description
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-12-09
Last Modified
2026-06-15
Generated
2026-06-16
AI Q&A
2025-12-09
EPSS Evaluated
2026-06-15
NVD
CVE-2025-64666
Affected Vendors & Products
Showing 38 associated CPEs
Vendor Product Version / Range
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2019
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2019
microsoft exchange_server 2019
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2016
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2019
microsoft exchange_server 2019
microsoft exchange_server_subscription_edition to 15.02.2562.035 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-20 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.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability is an improper input validation issue in Microsoft Exchange Server that allows an authorized attacker to elevate their privileges over a network.

Impact Analysis

An attacker exploiting this vulnerability can gain higher privileges than intended, potentially leading to full control over the affected Microsoft Exchange Server, which can compromise confidentiality, integrity, and availability of data.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-64666. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart