Vulnerability in Microsoft Exchange Server 2016 Cumulative Update 23
CVE-2025-53782
Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.
EPSS: 0.001 (20.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/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)
References
- Microsoft Exchange Server Elevation of Privilege Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2025-53782?
- CVE-2025-53782 is a high-severity vulnerability in Microsoft Exchange Server 2016 Cumulative Update 23, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 8.4/10. Published 2025-10-14.
- How severe is CVE-2025-53782?
- High severity. CVSS v3 base score is 8.4 out of 10.