Detections
Analytics
Security Updates for Microsoft Exchange Server (October 2025)
high Nessus Plugin ID 270373
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 October, 2025 security bulletin.- Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network. (CVE-2025-59249)
- Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally. (CVE-2025-53782)
- Improper input validation in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network. (CVE-2025-59248)
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:-KB5066367
-KB5066368
-KB5066369
Plugin Details
Severity: High
ID: 270373
File Name: smb_nt_ms25_oct_exchange.nasl
Version: 1.1
Type: local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 10/14/2025
Updated: 10/14/2025
Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: High
Base Score: 9
Temporal Score: 6.7
Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C
CVSS Score Source: CVE-2025-59249
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.7
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
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: 10/14/2025
Vulnerability Publication Date: 10/14/2025