CVE-2023-24880: Microsoft Windows SmartScreen Security Feature Bypass Vulnerability
Microsoft Windows SmartScreen contains a security feature bypass vulnerability that could allow an attacker to evade Mark of the Web (MOTW) defenses via a specially crafted malicious file.
| Vendor | Microsoft |
|---|---|
| Product | Windows |
| Date added to KEV | 2023-03-14 |
| Due date (BOD 22-01) | 2023-04-04 |
| Known ransomware campaign use | Known |
| CWE | CWE-863 |
| Required action | Apply updates per vendor instructions. |
What to do
- Identify every instance of Microsoft Windows in your environment (asset inventory, EDR, vulnerability scanner).
- Apply CISA's required action: Apply updates per vendor instructions.
- Federal civilian agencies must act by 2023-04-04 under BOD 22-01; other organizations can use the same date as a target.
- Because ransomware use is known, check for signs of compromise and confirm backups are offline and tested.
- Check the vendor advisory and NVD entry linked below for affected versions, then record the fix in your change log.
This CVE is flagged by CISA as known to be used in ransomware campaigns. Rehearse your response before you need it: Ransomware tabletop exercise kit (Runbook Foundry).