CISA Known Exploited Vulnerability
This vulnerability is actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities catalog.
Remediation Deadline: May 3, 2022
High
CISA KEVEPSS 94.3%RansomwareCVE-2021-27065
Microsoft—Exchange Server
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.
EPSS — Exploit Probability
94.3%
Higher than 99.9% of all CVEs
Required Action
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
Vulnerability Overview
- Severity
- High
- EPSS
- 94.3%
- CISA KEV
- Yes
- Ransomware
- Known
- Published
- Nov 3, 2021
- KEV Added
- Nov 3, 2021
- Due Date
- May 3, 2022
- Related Articles
- 0
Vendor
Microsoft
Exchange Server