Detections
Analytics
Security Updates for Microsoft Exchange Server (August 2025)
high Nessus Plugin ID 249140
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 August, 2025 security bulletin.- On April 18th 2025, Microsoft announced Exchange Server Security Changes for Hybrid Deployments and accompanying non-security Hot Fix. Microsoft made these changes in the general interest of improving the security of hybrid Exchange deployments. Following further investigation, Microsoft identified specific security implications tied to the guidance and configuration steps outlined in the April announcement.
Microsoft is issuing CVE-2025-53786 to document a vulnerability that is addressed by taking the steps documented with the April 18th announcement. Microsoft strongly recommends reading the information, installing the April 2025 (or later) Hot Fix and implementing the changes in your Exchange Server and hybrid environment. (CVE-2025-53786)
- Exposure of sensitive information to an unauthorized actor in Microsoft Exchange Server allows an unauthorized attacker to disclose information over a network. (CVE-2025-33051)
- Improper input validation in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network. (CVE-2025-25005)
- Improper handling of additional special element in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network. (CVE-2025-25006)
- Improper validation of syntactic correctness of input in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network. (CVE-2025-25007)
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:-KB5063221
-KB5063222
-KB5063223
See Also
http://www.nessus.org/u?ca5a35e4
Plugin Details
Severity: High
ID: 249140
File Name: smb_nt_ms25_aug_exchange.nasl
Version: 1.1
Type: local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 8/12/2025
Updated: 8/12/2025
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Critical
Score: 10.0
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 6.1
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N
CVSS Score Source: CVE-2025-33051
CVSS v3
Risk Factor: High
Base Score: 8
Temporal Score: 7.2
Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS Score Source: CVE-2025-53786
Vulnerability Information
CPE: cpe:/a:microsoft:exchange_server:2019, cpe:/a:microsoft:exchange_server:2016
Required KB Items: SMB/MS_Bulletin_Checks/Possible
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 8/12/2025
Vulnerability Publication Date: 8/6/2025
Reference Information
CVE: CVE-2025-25005, CVE-2025-25006, CVE-2025-25007, CVE-2025-33051, CVE-2025-53786