Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

HIGH

8.8 / 10

Minimal Risk Critical

Vector Specification

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

Exploitation Likelihood

94.40 %

Predictive Probability

Percentile Rank

100.0 th

Documented as more likely to be exploited than 100.0% of known CVEs.

Detection Date

Nov 03, 2021

Remediation Due

May 03, 2022

CISA Catalog Active

Threat Analysis

Microsoft Exchange Server Validation Key fails to properly create unique keys at install time, allowing for remote code execution.

Apply updates per vendor instructions.

Vendor Identity

Microsoft

Affected Product

Exchange Server

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-287

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2020-0688