Home/CVE/Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a networ
CVE

CVE-2025-64666

Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a networ

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

HIGH · CVSS 7.5 EPSS 0.00049
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
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Weakness Classification

CWE-20Improper Input Validation
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Affected Products & Versions

2
microsoft exchange server< 15.02.2562.035
microsoft exchange serverall versions
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Scoring & Timeline

7.5
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Dec 2025 · 06:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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Vendor Advisories

1
msrcCVE-2025-64666Elevation of Privilege
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