Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 94.7%; technical severity is CVSS 9.8.
Microsoft Outlook Remote Code Execution Vulnerability
Who should care
- Teams operating 365 Apps, Office 2016, Office 2019 +2 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether 365 Apps, Office 2016, Office 2019 +2 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 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-20
- Affected versions
- Microsoft 365 Apps (Version: -); Microsoft Office 2016 (Version: -); Microsoft Office 2019 (Version: -); Microsoft Office Long Term Servicing Channel (Version: 2021); Microsoft Office Outlook
- Published
- 13 February 2024
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 94.7%
- Signal calculated at 84