CVE-2021-26411: Microsoft Internet Explorer Memory Corruption Vulnerability

CVE-2021-26411 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03

A memory corruption vulnerability exists in Microsoft Internet Explorer due to a use-after-free (CWE-416) error. An attacker can exploit this by convincing a user to visit a specially crafted website, potentially leading to remote code execution.

Technologies: Microsoft Internet Explorer. Vendors: Microsoft.

Quick answers

Is CVE-2021-26411 exploited in the wild?
Yes. CVE-2021-26411 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-26411?
Critical severity, with a CVSS score of 8.8, published 3 November 2021.
Which products and versions are affected?
Microsoft Internet Explorer 11; Microsoft Edge; Microsoft Windows 10; Microsoft Windows 7; and 4 more.
Is there a fix for CVE-2021-26411?
A patch was published on 2021-11-03: Microsoft released security updates to address this vulnerability. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2021-26411 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2021-26411?
Check whether you run Microsoft Internet Explorer. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft Internet Explorer 11
  • Microsoft Edge
  • Microsoft Windows 10
  • Microsoft Windows 7
  • Microsoft Windows 8.1
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2019

Timeline

  • 2021-11-03: disclosed
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: patched: Microsoft released security updates to address this vulnerability.

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