CVE-2021-26411
Act now ● On CISA KEV — actively exploited used in ransomware
Actively exploited — on the CISA KEV list.
CVSS base
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L
EPSS — probability of exploitation (30 days)
80.8%
99.6th percentile
CISA KEV
Listed
Added 2021-11-03 · patch by 2021-11-17
Weakness / dates
CWE-416
Published 2021-03-11 · modified 2026-08-19
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | R | Required |
| Scope | C | Changed |
| Confidentiality | L | Low |
| Integrity | H | High |
| Availability | L | Low |
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
Internet Explorer Memory Corruption Vulnerability