CVE-2023-23397
Microsoft Outlook Elevation of Privilege Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 14 Mar 2023
Description
Microsoft Outlook Elevation of Privilege Vulnerability
Key facts
- Published
- 14 Mar 2023
- Last changed
- 21 Oct 2025
- Assigned by
- microsoft
- KEV added
- 14 Mar 2023
- KEV fix due
- 4 Apr 2023
- EPSS
- 97.159% likely to be exploited in the next 30 days, higher than 99.895% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom the CNA (microsoft)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/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 Office LTSC 2021 |
|
| Microsoft | Microsoft Outlook 2016 |
|
| Microsoft | Microsoft 365 Apps for Enterprise |
|
| Microsoft | Microsoft Office 2019 |
|
| Microsoft | Microsoft Outlook 2013 Service Pack 1 |
|
Timeline
- 14 Mar 2023 CVE-2023-23397 added to CISA KEV
- 14 Mar 2023 Added to the CISA KEV catalogue
- 14 Mar 2023 Published