CVE-2021-26857
KEV · RansomwareMicrosoft Exchange Server Remote Code Execution Vulnerability
View CVE record →- Vendor / Project
- Microsoft
- Product
- Exchange Server
- Date added
- Nov 3, 2021
- Due date
- May 3, 2022
- Known ransomware use
- Known
- CWEs
- CWE-502
Description
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.
Required action
Apply updates per vendor instructions.
Notes
- 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-2021-26857