Office Online Server
by Microsoft
Take action — actively targeted
Office Online Server is actively targeted by attackers. A significant proportion of its known vulnerabilities are being exploited.
What to do
- Apply all available updates immediately
- Review your exposure — is this internet-facing?
- Monitor vendor advisories for this product
What Attackers Target
Vulnerabilities with high exploit probability
31.1%
Confirmed actively exploited (CISA)
0.6%
Public exploit code available
0.0%
Based on 180 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-2023-21716 | 9.8 | 91.4% | — |
| CVE-2017-11826 | 7.8 | 90.8% | Yes |
| CVE-2016-3282 | 7.8 | 54.6% | — |
| CVE-2020-1447 | 8.8 | 46.0% | — |
| CVE-2017-0281 | 7.8 | 43.3% | — |
| CVE-2021-31178 | 5.5 | 41.9% | — |
| CVE-2023-32029 | 7.8 | 40.3% | — |
| CVE-2020-0980 | 7.8 | 40.2% | — |
| CVE-2020-0892 | 7.8 | 40.2% | — |
| CVE-2020-1446 | 8.8 | 39.9% | — |
| CVE-2020-1448 | 8.8 | 39.3% | — |
| CVE-2019-1331 | 8.8 | 38.3% | — |
| CVE-2018-0792 | 8.8 | 37.7% | — |
| CVE-2023-33133 | 7.8 | 37.2% | — |
| CVE-2018-8628 | 7.8 | 34.5% | — |
| CVE-2018-0797 | 7.8 | 34.0% | — |
| CVE-2020-0852 | 7.8 | 33.7% | — |
| CVE-2020-0850 | 8.8 | 33.5% | — |
| CVE-2018-0922 | 7.8 | 32.5% | — |
| CVE-2017-8743 | 7.8 | 32.4% | — |
50
/ 100
high-risk
Active Threat
50/50 · Critical
Exploit Availability
0/50 · Minimal
Score uses Wilson score intervals to account for sample size. Products with few CVEs are scored conservatively.