1. Home
  2. CVE Database
  3. CVE-2025-64666
HIGH · 7.5

CVE-2025-64666

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

Vulnerability Description

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

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftExchange Server< 15.02.2562.035

Related Weaknesses (CWE)

CWE-20

References

FAQ

What is CVE-2025-64666?

CVE-2025-64666 is a vulnerability with a CVSS score of 7.5 (HIGH). Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

How severe is CVE-2025-64666?

CVE-2025-64666 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-64666?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Exchange Server.