Windows 11 21H2
by Microsoft
Review your setup
Windows 11 21H2 has some exploitation signals but is generally manageable with regular updates.
What to do
- Keep this software updated
- Review your configuration for unnecessary exposure
- Check for known-vulnerable components or plugins
What Attackers Target
Vulnerabilities with high exploit probability
13.4%
Confirmed actively exploited (CISA)
6.7%
Public exploit code available
0.0%
Based on 1001 known vulnerabilities. Percentages show the proportion that are actively dangerous — a low percentage means most vulnerabilities in this product are not being exploited.
Most Dangerous Vulnerabilities
| CVE | CVSS | Exploit Probability | Confirmed |
|---|---|---|---|
| CVE-2023-44487 | 7.5 | 94.4% | Yes |
| CVE-2021-34527 | 8.8 | 94.2% | Yes |
| CVE-2024-21412 | 8.1 | 93.8% | Yes |
| CVE-2022-30190 | 7.8 | 93.6% | Yes |
| CVE-2023-36884 | 7.5 | 93.2% | Yes |
| CVE-2024-38112 | 7.5 | 92.6% | Yes |
| CVE-2023-21554 | 9.8 | 91.9% | — |
| CVE-2021-40449 | 7.8 | 91.7% | Yes |
| CVE-2022-26923 | 8.8 | 91.4% | Yes |
| CVE-2023-36025 | 8.8 | 90.2% | Yes |
| CVE-2022-21882 | 7.0 | 90.1% | Yes |
| CVE-2024-38063 | 9.8 | 89.9% | — |
| CVE-2022-21971 | 7.8 | 87.1% | Yes |
| CVE-2023-38146 | 8.8 | 86.5% | — |
| CVE-2024-30088 | 7.0 | 84.8% | Yes |
| CVE-2024-26229 | 7.8 | 83.2% | — |
| CVE-2024-38144 | 8.8 | 79.8% | — |
| CVE-2024-21338 | 7.8 | 79.1% | Yes |
| CVE-2013-3900 | 5.5 | 78.1% | Yes |
| CVE-2023-36802 | 7.8 | 75.4% | Yes |
31
/ 100
moderate-risk
Active Threat
23/50 · Moderate
Exploit Availability
8/50 · Minimal
Score uses Wilson score intervals to account for sample size. Products with few CVEs are scored conservatively.