CVE-2021-34523
Microsoft Exchange Server Privilege Escalation Vulnerability
Published Jul 14, 2021 · updated Aug 10, 2026 · microsoft exchange server
Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.
Timeline
Detection, updates, and resolution for this record.
Jul 14, 2021 · Catalog
Detected
Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.
Nov 3, 2021 · CISA KEV
Known exploited
Apply updates per vendor instructions.
Nov 17, 2021 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Aug 10, 2026 · Catalog
Updated
Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.
Required action
Apply updates per vendor instructions.
CISA due date Nov 17, 2021
Affected
- cpe microsoft/exchange server2013
- cpe microsoft/exchange server2016
- cpe microsoft/exchange server2019
- vendor Microsoft Exchange Serverversion unspecified
Sources
- CISA KEVCVE-2021-34523
Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.
cisa.gov - CVE.orgCVE-2021-34523
Official CVE identifier
cve.org - FIRST EPSSCVE-2021-34523
30-day exploitation probability 100.0%
first.org - Metasploit Modulesexploit_windows/http/exchange_proxyshell_rce
Public module reference (excellent). Module source is not copied into this catalog.
rapid7.com - NIST NVDCVE-2021-34523
Microsoft Exchange Server Elevation of Privilege Vulnerability
nvd.nist.gov - Packet Storm Securityhttp://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html
Packet Storm link already published on the finding.
packetstormsecurity.com