Detections
Analytics
Security Updates for Microsoft Exchange Server (December 2025)
high Nessus Plugin ID 278114
Language:
Synopsis
The Microsoft Exchange Server installed on the remote host is affected by multiple vulnerabilities.Description
The Microsoft Exchange Server installed on the remote host is missing a security update. It is, therefore, affected by multiple vulnerabilities as referenced in the December, 2025 security bulletin.- Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network. (CVE-2025-64666)
- User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network. (CVE-2025-64667)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Microsoft has released the following security updates to address this issue:-KB5071873
-KB5071874
-KB5071875
Plugin Details
Severity: High
ID: 278114
File Name: smb_nt_ms25_dec_exchange.nasl
Version: 1.2
Type: local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 12/10/2025
Updated: 12/12/2025
Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.4
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
CVSS Score Source: CVE-2025-64667
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS Score Source: CVE-2025-64666
Vulnerability Information
CPE: cpe:/a:microsoft:exchange_server:2019, cpe:/a:microsoft:exchange_server:2016
Required KB Items: SMB/MS_Bulletin_Checks/Possible
Exploit Ease: No known exploits are available
Patch Publication Date: 12/9/2025
Vulnerability Publication Date: 12/9/2025
Reference Information
CVE: CVE-2025-64666, CVE-2025-64667