CVE-2021-43226
Act now ● On CISA KEV — actively exploited used in ransomware
Actively exploited — on the CISA KEV list.
CVSS base
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
3.1%
87.0th percentile
CISA KEV
Listed
Added 2025-10-06 · patch by 2025-10-27
Weakness / dates
—
Published 2021-12-15 · modified 2026-08-22
CVSS breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | L | Local |
| Attack Complexity | L | Low |
| Privileges Required | L | Low |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2021-12-15 — Published (NVD)
- 2025-10-06 — Added to CISA KEV (actively exploited)
- 2025-10-27 — CISA patch-by deadline
- 2026-08-22 — Last modified (NVD)
Description
Windows Common Log File System Driver Elevation of Privilege Vulnerability