PT-2025-50198 · Microsoft · Exchange Server

CVE-2025-64666 · Published 2025-12-09 · Updated 2026-06-16

Positive Technologies (AI Summary)

CVSS v2.0

10

High

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Microsoft Exchange Server (affected versions not specified)

Description Improper input validation in Microsoft Exchange Server can allow an authorized attacker to elevate privileges on a network. This issue allows attackers to affect the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2025-15519

CVE-2025-64666

Affected Products

Exchange Server

References · 7

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-64666 · Security Note
• https://osv.dev/vulnerability/CVE-2025-64666 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-64666 · Security Note
• https://bdu.fstec.ru/vul/2025-15519 · Security Note
• https://twitter.com/CVEnew/status/1998781362946363879 · Twitter Post
• https://t.me/cveNotify/167467 · Telegram Post