CVE-2021-42321
CISA KEV RANSOMWARE
ACT NOW
Priority: 0.00
BB Relevance:
0/100
Published: N/A
Modified: N/A
First seen: 2026-10-29
Status: pending_score
Description
An authenticated attacker could leverage improper validation in cmdlet arguments within Microsoft Exchange and perform remote code execution.
CISA Known Exploited Vulnerability
Vendor / Product
Microsoft — Exchange
Date Added
2021-11-17
Remediation Due
2021-12-01
Ransomware Use
CONFIRMED
https://nvd.nist.gov/vuln/detail/CVE-2021-42321
Affected Software (4)
| Vendor | Product | Version |
|---|---|---|
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2019 |
| microsoft | exchange_server | 2019 |
References & Advisories (5)
US Government Resource
Patch
Vendor Advisory
Patch
Vendor Advisory
Exploit
Third Party Advisory
VDB Entry
Exploit
Third Party Advisory
VDB Entry