CVE-2025-62221
Microsoft — Microsoft Windows Use After Free Vulnerability
CISA KEV · in the CISA KEV catalog since 2025-12-09
What EVULNABLE says
Listed in the CISA KEV catalog, and an EPSS probability of 0.025.
Patch This Cycle
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 | 7.8 | NVD | How severe the flaw is in itself. It does not say how likely an attack is. |
| FIRST EPSS | 0.025 (84.5th 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 | Confirmed | CISA KEV | Whether a source of record has confirmed attacks using it in the wild. |
| Ransomware campaign use | Unknown or none | CISA KEV | Whether CISA has seen ransomware operators use it. |
| CISA remediation deadline | 2025-12-30 — CISA federal deadline · Overdue by 10 months | CISA KEV | The date US federal agencies must have fixed or mitigated it. |
What CISA says to do
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-2025-62221 is a Microsoft entry in the CISA KEV catalog. The priority feed ranks Microsoft's current monthly release rather than older Microsoft CVEs, so this one is not listed there; the page above scores it from the same sources.