CVE-2021-31207
Microsoft Exchange Server Security Feature Bypass Vulnerability
Published May 11, 2021 · updated Jun 16, 2026 · microsoft exchange server
Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.
Timeline
Detection, updates, and resolution for this record.
May 11, 2021 · Catalog
Detected
Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.
Nov 3, 2021 · CISA KEV
Known exploited
Apply updates per vendor instructions.
Nov 17, 2021 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Jun 16, 2026 · Catalog
Updated
Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.
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-2021-31207
Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.
cisa.gov - CVE.orgCVE-2021-31207
Official CVE identifier
cve.org - FIRST EPSSCVE-2021-31207
30-day exploitation probability 99.8%
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-2021-31207
Microsoft Exchange Server Security Feature Bypass Vulnerability
nvd.nist.gov