CVE-2021-26443
Medium
Elevated severity or exploit probability.
CVSS base
9.0
CRITICAL
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
1.7%
75.9th percentile
CISA KEV
Not listed
Weakness / dates
—
Published 2021-11-10 · modified 2026-08-19
CVSS breakdown
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
| Attack Vector | A | Adjacent |
| Attack Complexity | L | Low |
| Privileges Required | L | Low |
| User Interaction | N | None |
| Scope | C | Changed |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2021-11-10 — Published (NVD)
- 2026-08-19 — Last modified (NVD)
Description
Microsoft Virtual Machine Bus (VMBus) Remote Code Execution Vulnerability