All vulnerabilities
CVE-2021-31196

Microsoft Exchange Server Information Disclosure Vulnerability

Microsoft Exchange ServerApplications & CMS
Open in ThreatlineRecord JSON
CVSS
7.2High
ExploitationExploited in the wildAdded to KEV 21 Aug 2024CISA KEV
Exploit odds (EPSS)54.1%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in15.00.1497.023Also 15.01.2242.012, 15.01.2308.014 and 2 moreCVE List
Federal deadline11 Sep 2024Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

  • 15.00.1497.023Microsoft Exchange Server 2013 Cumulative Update 23CVE List
  • 15.01.2242.012Microsoft Exchange Server 2016 Cumulative Update 20CVE List
  • 15.01.2308.014Microsoft Exchange Server 2016 Cumulative Update 21CVE List
  • 15.02.0922.013Microsoft Exchange Server 2019 Cumulative Update 10CVE List
  • 15.02.0858.015Microsoft Exchange Server 2019 Cumulative Update 9CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 14 Jul 2021, 17:53 UTCPublishedCVE List
  2. 21 Aug 2024Added to CISA KEVCISA KEV

Description

Microsoft Exchange Server contains an information disclosure vulnerability that allows for remote code execution.

Text from CVE List

Affected versions 5

  • Microsoft Exchange Server 2013 Cumulative Update 23affected: 15.00.0 before 15.00.1497.023CVE List
  • Microsoft Exchange Server 2016 Cumulative Update 20affected: 15.01.0 before 15.01.2242.012CVE List
  • Microsoft Exchange Server 2016 Cumulative Update 21affected: 15.01.0 before 15.01.2308.014CVE List
  • Microsoft Exchange Server 2019 Cumulative Update 10affected: 15.02.0 before 15.02.0922.013CVE List
  • Microsoft Exchange Server 2019 Cumulative Update 9affected: 15.02.0 before 15.02.0858.015CVE List

References 5