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Findings

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.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 9, 2025 · NIST NVD

    Detected

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

  2. 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.orgVulnerability recordCVE-2025-64666

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-64666

    30-day exploitation probability 1.0%

    first.org
  • NIST NVDVulnerability recordCVE-2025-64666

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

    nvd.nist.gov

References