CVE-2025-64666

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

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

1.0% chance of exploitation in the next 30 days; higher than 63% of CVEs (scores of 2026-10-25)

CWE

CWE-20

Published

2025-12-09

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:exchange_server
• microsoft:exchange_server_subscription_edition

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666

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