CVE-2021-31195: Microsoft Exchange Server Remote Code Execution Vulnerability

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2021-May

Released

2021-05-11

EPSS Score

77.61% (percentile: 99.0%)

Detection & Weaponization (1 sources)

Maturity: Exploit

• Nuclei templates: Microsoft Exchange Server - Cross-Site Scripting

Affected Products (5)

Exchange Server

• Microsoft Exchange Server 2016 Cumulative Update 19
• Microsoft Exchange Server 2019 Cumulative Update 8
• Microsoft Exchange Server 2019 Cumulative Update 9
• Microsoft Exchange Server 2016 Cumulative Update 20
• Microsoft Exchange Server 2013 Cumulative Update 23

Security Updates (5)

• 5003435
• 5003435
• 5003435
• 5003435
• 5003435

Acknowledgments

Orange Tsai(@orange_8361) from DEVCORE

Revision History

• 2021-05-11: Information published.