CVE-2021-31196
Microsoft Exchange Server Remote Code Execution Vulnerability
- High 7.2
- Exploited: added to CISA KEV 21 Aug 2024
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Key facts
- Published
- 14 Jul 2021
- Last changed
- 10 Aug 2026
- Assigned by
- microsoft
- KEV added
- 21 Aug 2024
- KEV fix due
- 11 Sep 2024
- EPSS
- 54.056% likely to be exploited in the next 30 days, higher than 99.023% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 7.2CVSS 3.1, Highfrom the CNA (microsoft)
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
What to do
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 |
|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 20 |
|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 21 |
|
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 10 |
|
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 9 |
|
Timeline
- 14 Jul 2021 Published
- 21 Aug 2024 Added to the CISA KEV catalogue