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Unrated severityCISA KEVNVD Advisory· Published May 11, 2021· Updated Oct 21, 2025

Microsoft Exchange Server Security Feature Bypass Vulnerability

CVE-2021-31207

Description

Microsoft Exchange Server Security Feature Bypass Vulnerability

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

6

Microsoft/Exchange Serverv56 versions
cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*+ 5 more
- cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*range: 15.00.0
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*range: 15.01.0
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*range: 15.01.0
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*range: 15.02.0
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*range: 15.02.0
- (no CPE)

Patches

Vulnerability mechanics

References

3

packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.htmlmitrex_refsource_MISC
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207mitrex_refsource_MISC
www.zerodayinitiative.com/advisories/ZDI-21-819/mitrex_refsource_MISC

News mentions

0

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