HIGHCVSS 8.8Actively exploited · CISA KEV since 2021-11-03Vulnerability

CVE-2021-26411

Microsoft Internet Explorer contains an unspecified vulnerability that allows for memory corruption.

Properties

Euvd product
Internet Explorer 9, Microsoft Edge (EdgeHTML-based), Internet Explorer 11
Vulnerability name
Microsoft Internet Explorer Memory Corruption Vulnerability
First seen
2026-10-01T20:31:07+00:00
Cvss score
8.8
Epss score
0.81667
Last seen
2026-10-19T12:00:27+00:00
Due date
2021-11-17
Euvd assigner
microsoft
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2021-11-03T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2021-11-03
Euvd base score version
3.1
Score
8.8
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Microsoft
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L
In Signal since
initial import (Sep 2026)
Euvd base score
8.8

Related Entities (24 · showing 23)

AFFECTS_PRODUCT (21 · showing 20)

→[Product]cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:*
→[Product]cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:*
→[Product]cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
→[Product]cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Microsoft Internet Explorer Memory Corruption Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Use After Free

INVOLVES (1)

←[Signal]kev_added · 2021-11-03

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CVE-2021-26411 (CVSS 8.8) — Ninja Signal Threat Intelligence | Ninja Signal