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CVE-2021-26411

Internet Explorer Memory Corruption Vulnerability

  • High 8.8
  • Exploited: added to CISA KEV 3 Nov 2021
  • Used in ransomware campaigns

Description

Internet Explorer Memory Corruption Vulnerability

Key facts

Published
11 Mar 2021
Last changed
1 Oct 2026
Assigned by
microsoft
KEV added
3 Nov 2021
KEV fix due
17 Nov 2021
Used in ransomware
Yes, according to CISA
EPSS
81.667% likely to be exploited in the next 30 days, higher than 99.65% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.8CVSS 3.1, Highfrom the CNA (microsoft)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 to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
MicrosoftInternet Explorer 11
  • 1.0.0 up to but excluding 10.0.17134.2087 (affected)
MicrosoftInternet Explorer 9
  • 1.0.0 up to but excluding 6.0.6003.21070 (affected)
MicrosoftMicrosoft Edge (EdgeHTML-based)
  • 1.0..0 up to but excluding 10.0.17134.2087 (affected)

Timeline

  1. 11 Mar 2021 Published
  2. 3 Nov 2021 Added to the CISA KEV catalogue

Weakness

References