CVE-2025-64666

CWE-20 — Improper Input Validation5 documents5 sources
Severity
7.5HIGH
EPSS
0.1%
top 72.02%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23Microsoft Microsoft Exchange Server 2019 Cumulative Update 14Microsoft Microsoft Exchange Server 2019 Cumulative Update 15+2 more
Timeline
PublishedDec 9

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.6 | Impact: 5.9

Affected Packages5 packages

▶NVDmicrosoft/exchange_server< 15.02.2562.035+2
▶CVEListV5microsoft/microsoft_exchange_server_subscription_edition_rtm15.02.0.0 — 15.02.2562.035

🔴Vulnerability Details

2
CVEList
Microsoft Exchange Server Elevation of Privilege Vulnerability↗2025-12-09
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GHSA
GHSA-mr7p-99h9-v459: Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network↗2025-12-09
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📋Vendor Advisories

1
Microsoft
Microsoft Exchange Server Elevation of Privilege Vulnerability↗2025-12-09
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🕵️Threat Intelligence

1
Wiz
CVE-2025-64666 Impact, Exploitability, and Mitigation Steps | Wiz↗
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