CVE-2025-64666
HIGHMicrosoft Exchange Server - Privilege Escalation via Improper Input Validation
Title source: llmDescription
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
patch
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666
Scores
CVSS v3
7.5
EPSS
0.0005
EPSS Percentile
15.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-20
Status
published
Products (7)
microsoft/exchange_server
2016 (23 CPE variants)
microsoft/exchange_server
2019 (14 CPE variants)
microsoft/exchange_server
< 15.02.2562.035
Microsoft/Microsoft Exchange Server 2016 Cumulative Update 23
15.01.0.0 - 15.01.2507.063
Microsoft/Microsoft Exchange Server 2019 Cumulative Update 14
15.02.0.0 - 15.02.1544.037
Microsoft/Microsoft Exchange Server 2019 Cumulative Update 15
15.02.0.0 - 15.02.1748.042
Microsoft/Microsoft Exchange Server Subscription Edition RTM
15.02.0.0 - 15.02.2562.035
Published
Dec 09, 2025
Tracked Since
Feb 18, 2026