CVE-2024-21351
Microsoft Windows SmartScreen Security Feature Bypass Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 5 March 2024). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Windows SmartScreen Security Feature Bypass Vulnerability
- CVSS 3.1
- 7.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
- EPSS
- 27.80% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 13 February 2024 · due 5 March 2024
- Weakness
- CWE-94
- Affected
- microsoft/windows 10 1507 · microsoft/windows 10 1607 · microsoft/windows 10 1809 · microsoft/windows 10 21h2 · microsoft/windows 10 22h2 · microsoft/windows 11 21h2 · microsoft/windows 11 22h2 · microsoft/windows 11 23h2 · microsoft/windows server 2016 · microsoft/windows server 2019 · microsoft/windows server 2022 · microsoft/windows server 2022 23h2
- Source
- secure@microsoft.com
EPSS moved from 27.8% on 24 September 2026 to 27.8% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-21351; https://nvd.nist.gov/vuln/detail/CVE-2024-21351
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21351Patch, Vendor Advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21351Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21351US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.