CVE-2021-27065
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
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.
CISA Known Exploited Vulnerability
Vendor / Product
Microsoft — Exchange Server
Date Added
2021-11-03
Remediation Due
2022-05-03
Ransomware Use
CONFIRMED
Reference CISA's ED 21-02 (https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-02. https://nvd.nist.gov/vuln/detail/CVE-2021-27065
Weakness Classification (1)
Affected Software (24)
| Vendor | Product | Version |
|---|---|---|
| microsoft | exchange_server | 2013 |
| microsoft | exchange_server | 2013 |
| microsoft | exchange_server | 2013 |
| microsoft | exchange_server | 2013 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2016 |
| microsoft | exchange_server | 2019 |
| microsoft | exchange_server | 2019 |
| microsoft | exchange_server | 2019 |
| microsoft | exchange_server | 2019 |
| microsoft | exchange_server | 2019 |
| microsoft | exchange_server | 2019 |
| microsoft | exchange_server | 2019 |
| 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