Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 97.4%; technical severity is CVSS 9.8.
Microsoft Outlook Elevation of Privilege Vulnerability
Who should care
- Teams operating 365 Apps, Office, Office Long Term Servicing Channel +1 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether 365 Apps, Office, Office Long Term Servicing Channel +1 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apply updates per vendor instructions.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Vendor remediation
Patch and remediation links
Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-294
- Affected versions
- Microsoft 365 Apps (Version: -); Microsoft Office (Version: 2019); Microsoft Office Long Term Servicing Channel (Version: 2021); Microsoft Outlook (Version: 2016)
- Published
- 14 March 2023
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 97.4%
- Signal calculated at 85