CVE-2021-26411 HIGH

CVE-2021-26411: Internet Explorer Memory Corruption Vulnerability

Vendor Microsoft
Product Internet Explorer 9
KEV Status Known Exploited
Ransomware Used in campaigns
Published March 11, 2021
Last update October 21, 2025
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L/E:P/RL:O/RC:C

What the vulnerability does

01Description

Internet Explorer Memory Corruption Vulnerability

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

March 11, 2021 CVE published
October 21, 2025 Record updated