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CVE-2021-26411

Published: Mar 11, 2021Updated: Oct 30, 2025 Sources: CVE List NVD BDUCWE-416
NVD MITRE
8.8CVSSHIGH
EPSS Score
81.1%
Top 0.4%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
No Known Exploits
Remediation
Patch Available

Description

Internet Explorer Memory Corruption Vulnerability

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:HA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:HIntegrity
High
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-416

Affected Products

Internet ExplorerMicrosoft Corp
Desktop App
Consumer Software / browser
Microsoft EdgeMicrosoft Corp
On-premDesktop App
Consumer Software / browser
Internet Explorer 9Microsoft
On-premDesktop App
Consumer Software / browser
Internet Explorer 11Microsoft
On-premDesktop App
Consumer Software / browser
Microsoft Edge (EdgeHTML-based)Microsoft
On-premDesktop App
Consumer Software / browser
microsoft corpcommercialUSOperating Systemsaka microsoft corporation
microsoftcommercialUSOperating Systems
and 2 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:Nov 17, 2021
Ransomware:Known ransomware use

Required action: Apply updates per vendor instructions.

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26411
msrc.microsoft.com
https://www.cybersecurity-help.cz/vdb/SB2021020701
cybersecurity-help.cz
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26411
portal.msrc.microsoft.com
and 1 more references View all →

Timeline

Published
Mar 11, 2021
Added to CISA KEV
Nov 3, 2021
Last Updated
Oct 30, 2025

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