CVE-2021-31198: Microsoft Exchange Server Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

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

3.96% (percentile: 88.4%)

Affected Products (5)

Exchange Server

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

Security Updates (5)

• 5003435
• 5003435
• 5003435
• 5003435
• 5003435

Acknowledgments

Microsoft Security Team, Microsoft Security Team, Pham Van Khanh (@rskvp93) from Viettel Cyber Security working with <a href="https://www.zerodayinitiative.com/">Trend Micro Zero Day Initiative</a>

Revision History

• 2021-05-11: Information published.