CVE-2021-26857 — Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-26857: Microsoft Exchange Server Remote Code Execution Vulnerability
CISA Known Exploited Vulnerability (KEV)
| Vendor / project | Microsoft |
| Product | Exchange Server |
| Date added | 2021-11-03 |
| Due date | 2022-05-03 |
| Ransomware campaign use | Known |
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 (CISA)
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
References
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26857
- KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog