CVE-2025-25005: Microsoft Exchange Server Tampering Vulnerability

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Category

Tampering

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2025-Aug

Released

2025-08-12

EPSS Score

0.32% (percentile: 55.0%)

Description

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

Affected Products (4)

ESU

• Microsoft Exchange Server 2019 Cumulative Update 14
• Microsoft Exchange Server 2016 Cumulative Update 23
• Microsoft Exchange Server 2019 Cumulative Update 15

Server Software

• Microsoft Exchange Server Subscription Edition RTM

Security Updates (4)

• 5063222
• 5063223
• 5063221
• 5063224

Revision History

• 2025-08-12: Information published.