CVE DATABASE / CVE-2021-26411
CVE-2021-26411
Microsoft Internet Explorer Memory Corruption Vulnerability
CVSS 8.8 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
RANSOMWARE
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2021-11-03.
Federal remediation due 2021-11-17.
Required action: Apply updates per vendor instructions.
Summary
Internet Explorer Memory Corruption Vulnerability
CVSS 3.1 breakdown
| Base score | 8.8 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | CHANGED |
| Confidentiality | LOW |
| Integrity | HIGH |
| Availability | LOW |
Weakness type (CWE)
Affected products
Microsoft edgeMicrosoft windows 10 1507Microsoft windows 10 1607Microsoft windows 10 1803Microsoft windows 10 1809Microsoft windows 10 1909Microsoft windows 10 2004Microsoft windows 10 20h2Microsoft windows server 2016Microsoft windows server 2019Microsoft internet explorerMicrosoft windows 7Microsoft windows 8.1Microsoft windows rt 8.1Microsoft windows server 2008Microsoft windows server 2012
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References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26411
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26411
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-30. Always verify against the vendor advisory before acting.