CVE-2021-27059
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
7.6
HIGH
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
6.1%
93.1th percentile
CISA KEV
Listed
Added 2021-11-03 · patch by 2021-11-17
Weakness / dates
—
Published 2021-03-11 · modified 2026-08-19
CVSS breakdown
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
| Attack Vector | N | Network |
| Attack Complexity | H | High |
| Privileges Required | H | High |
| User Interaction | R | Required |
| Scope | C | Changed |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2021-03-11 — Published (NVD)
- 2021-11-03 — Added to CISA KEV (actively exploited)
- 2021-11-17 — CISA patch-by deadline
- 2026-08-19 — Last modified (NVD)
Description
Microsoft Office Remote Code Execution Vulnerability