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IMMUNITYSEC

CVE-2021-26411

Internet Explorer Memory Corruption Vulnerability

8.8
HIGH
CVSS 3.1
EPSS 80.8% · 100th pctCISA KEV · Exploited in the wild
2021-03-11•Updated 2026-10-01•KEV 2021-11-03
CISA Known Exploited Vulnerabilities

Microsoft Internet Explorer Memory Corruption Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV
2021-11-03
Remediation due
2021-11-17
Ransomware
Known use

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-26411

Description

Internet Explorer Memory Corruption Vulnerability

Severity

CVSS 3.1 · CNA8.8 HIGH
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
SSVC · CISA-ADP
Exploitationactive
Automatableno
Technical impactpartial

Affected Products

VendorProductAffected versions
MicrosoftInternet Explorer 11
1.0.0 to <10.0.17134.2087
MicrosoftInternet Explorer 9
1.0.0 to <6.0.6003.21070
MicrosoftMicrosoft Edge (EdgeHTML-based)
1.0..0 to <10.0.17134.2087

References

2 Links

Record Details

Published
2021-03-11
Last updated
2026-10-01
Assigner (CNA)
microsoft
Credited to
-

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.