Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Metrics
CVSS 3.1 9.1/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 | >= 15.00.0, < 15.00.1497.015 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 19 | >= 15.01.0, < 15.01.2176.012 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 20 | >= 15.01.0, < 15.01.2242.008 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 8 | >= 15.02.0, < 15.02.0792.013 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 9 | >= 15.02.0, < 15.02.0858.010 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473Patch, Vendor Advisory
- http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473Patch, Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-821/Third Party Advisory, VDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473US Government Resource
Timeline
- Published
- Jul 14, 2021
- Last modified
- Aug 10, 2026
- Added to CISA KEV
- Nov 3, 2021
- NVD status
- Analyzed