CVE-2025-64666
moderate-risk
Published 2025-12-09
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Do I need to act?
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0.10% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10
High
NETWORK
/ HIGH complexity
Affected Products (20)
Affected Vendors
References (1)
46
/ 100
moderate-risk
Severity
22/34 · High
Exploitability
0/34 · Minimal
Exposure
24/34 · High