CVE-2026-83636
Microsoft — Windows Hyper-V Denial of Service Vulnerability
Patch Tuesday
What EVULNABLE says
An EPSS probability of 0.004, and CVSS base score 6.5.
Scheduled Maintenance
The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.
The evidence behind it
| Measure | Value | Source | What it means |
|---|---|---|---|
| CVSS base score | 6.5 | — | How severe the flaw is in itself. It does not say how likely an attack is. |
| FIRST EPSS | 0.004 (31.7th pctl) | FIRST | FIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. |
| Actively exploited | Not confirmed | Patch Tuesday | Whether a source of record has confirmed attacks using it in the wild. |
2 days recorded, 2026-10-14 to 2026-10-15
0.39% as of 2026-10-15 (31.6th percentile). FIRST EPSS, recorded daily since this page started tracking it.
2026-10-14
2026-10-15
The primary records
This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.
Where this sits
CVE-2026-83636 is one of the entries ranked on the priority feed and in this month's Microsoft release.