CVE-2020-17144
Microsoft Exchange Remote Code Execution Vulnerability
- High 8.4
- Exploited: added to CISA KEV 3 Nov 2021
Description
Microsoft Exchange Remote Code Execution Vulnerability
Key facts
- Published
- 9 Dec 2020
- Last changed
- 9 Jun 2026
- Assigned by
- microsoft
- KEV added
- 3 Nov 2021
- KEV fix due
- 3 May 2022
- EPSS
- 36.514% likely to be exploited in the next 30 days, higher than 98.519% 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.
- 8.4CVSS 3.1, Highfrom the CNA (microsoft)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
What to do
- Apply updates per vendor instructions.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 2010 Service Pack 3 Update Rollup 31 |
|
Timeline
- 9 Dec 2020 Published
- 3 Nov 2021 CVE-2020-17144 added to CISA KEV
- 3 Nov 2021 Added to the CISA KEV catalogue