CVE-2025-64666 - Vulnerability Details - OpenCVE

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

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Vendors	Products
Microsoft	Exchange Server 2016 Exchange Server 2019 Exchange Server Se

No data.

No data.

References

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

History

Tue, 09 Dec 2025 21:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Tue, 09 Dec 2025 18:15:00 +0000

Type	Values Removed	Values Added
Description		Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Title		Microsoft Exchange Server Elevation of Privilege Vulnerability
First Time appeared		Microsoft Microsoft exchange Server 2016 Microsoft exchange Server 2019 Microsoft exchange Server Se
Weaknesses		CWE-20
CPEs		cpe:2.3:a:microsoft:exchange_server_2016::cumulative_update_23::::::* cpe:2.3:a:microsoft:exchange_server_2019::cumulative_update_14::::::* cpe:2.3:a:microsoft:exchange_server_2019::cumulative_update_15::::::* cpe:2.3:a:microsoft:exchange_server_se::RTM::::::*
Vendors & Products		Microsoft Microsoft exchange Server 2016 Microsoft exchange Server 2019 Microsoft exchange Server Se
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}`

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2025-12-09T17:55:45.263Z

Updated: 2025-12-10T04:56:35.776Z

Reserved: 2025-11-06T23:40:37.276Z

Link: CVE-2025-64666

Vulnrichment

Updated: 2025-12-09T20:16:14.522Z

NVD

Status : Awaiting Analysis

Published: 2025-12-09T18:16:05.910

Modified: 2025-12-09T18:36:29.050

Link: CVE-2025-64666

Redhat

No data.

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