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CVE record · CVE-2021-31196

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS 7.2 HighCriticalIn CISA KEVEPSS 0.54 · 99th percentile

Critical, because:

  • In CISA’s KEV catalogue since 21 Aug 2024: it is known to be exploited.
  • CVSS score 7.2 (7.0 or more) and EPSS 0.54 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 14 Jul 2021, 17:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23
  • affected 15.00.0 to before 15.00.1497.023 custom
Microsoft Microsoft Exchange Server 2016 Cumulative Update 20
  • affected 15.01.0 to before 15.01.2242.012 custom
Microsoft Microsoft Exchange Server 2016 Cumulative Update 21
  • affected 15.01.0 to before 15.01.2308.014 custom
Microsoft Microsoft Exchange Server 2019 Cumulative Update 10
  • affected 15.02.0 to before 15.02.0922.013 custom
Microsoft Microsoft Exchange Server 2019 Cumulative Update 9
  • affected 15.02.0 to before 15.02.0858.015 custom
Identifiers
CVE-2021-31196
CNA
microsoft
Tags
Published
14 Jul 2021
Updated
10 Aug 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.2 High 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Listed since 21 Aug 2024: known to be exploited.
  • EPSS 0.54, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 14 Jul 2021. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.