What is CVE-2025-25005?

CVE-2025-25005 is a medium-severity vulnerability in Microsoft Exchange Server 2016 Cumulative Update 23, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2025-08-12.

How severe is CVE-2025-25005?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Microsoft Exchange Server 2016 Cumulative Update 23

CVE-2025-25005

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

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.023 (85.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). 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.

Affected products

Microsoft Exchange Server 2016 Cumulative Update 23 — versions 15.01.0.0
Microsoft Exchange Server 2019 Cumulative Update 14 — versions 15.02.0.0
Microsoft Exchange Server 2019 Cumulative Update 15 — versions 15.02.0.0
Microsoft Exchange Server Subscription Edition Rtm — versions 15.02.0.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

Microsoft Exchange Server Tampering Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2025-25005?: CVE-2025-25005 is a medium-severity vulnerability in Microsoft Exchange Server 2016 Cumulative Update 23, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2025-08-12.
How severe is CVE-2025-25005?: Medium severity. CVSS v3 base score is 6.5 out of 10.