HIGH CISA KEV
CVE-2021-26411
CVSS v3
8.8
HIGH
EPSS Score
92.5 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
Description
Internet Explorer Memory Corruption Vulnerability
CISA Known Exploited Vulnerability
- Date Added
- 2021-11-03
- Patch Due Date
- 2021-11-17
- Ransomware Use
- Known
Technical details
- CVSS v3 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
- Published
- 2021-03-11
- Last Modified
- 2026-08-19
Frequently asked questions
What is CVE-2021-26411?
Internet Explorer Memory Corruption Vulnerability
Is CVE-2021-26411 actively exploited?
Yes. CVE-2021-26411 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2021-11-17.
What is the CVSS score for CVE-2021-26411?
CVE-2021-26411 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string 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.
Is CVE-2021-26411 affecting your environment?
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