CVE-2025-64666
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Published Dec 9, 2025 · updated Oct 14, 2026 · microsoft exchange server
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Timeline
Detection, updates, and resolution for this record.
Dec 9, 2025 · NIST NVD
Detected
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Oct 14, 2026 · NIST NVD
Updated
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Affected
- cpe microsoft/exchange server2016
Sources
- CVE.orgCVE-2025-64666
Official CVE identifier
cve.org - FIRST EPSSCVE-2025-64666
30-day exploitation probability 1.0%
first.org - NIST NVDCVE-2025-64666
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
nvd.nist.gov