OnlyFm252
Internet Explorer

CVE-2021-26419 — Scripting Engine Memory Corruption Vulnerability

Critical CVSS 7.5 EPSS 0.22595 2021-05 archive

Executive Summary

None

Overview

7.5
CVSS HIGH
Critical
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Remote Code Execution
Released May 11 2021
Last Updated May 11 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.22595 — 0.97419 percentile
NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.7

EPSS Score

0.22595
probability of exploitation in the next 30 days
0.97419 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

21 affected products
Product KB Article Severity Impact Restart Required
Internet Explorer 11 on Windows 10 for 32-bit Systems 5003172 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 for x64-based Systems 5003172 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems 5003197 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems 5003197 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems 5003174 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems 5003174 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems 5003174 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems 5003171 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems 5003171 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems 5003171 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems 5003169 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems 5003169 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems 5003169 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 2004 for 32-bit Systems 5003173 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 2004 for ARM64-based Systems 5003173 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 2004 for x64-based Systems 5003173 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 20H2 for 32-bit Systems 5003173 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 20H2 for ARM64-based Systems 5003173 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 5003233 (Monthly Rollup) 5003165 (IE Cumulative) Critical Remote Code Execution 5001335 5000800 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C 6.1.7601.24597 6.1 Yes 5003233 Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 5003233 (Monthly Rollup) 5003165 (IE Cumulative) Critical Remote Code Execution 5001335 5000800 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C 6.1.7601.24597 6.1 Yes 5003233 Internet Explorer 11 on Windows 8.1 for 32-bit systems 5003209 (Monthly Rollup) 5003165 (IE Cumulative) Critical Remote Code Execution 5001382 5000800 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C 6.3.9600.20017 6.3.9600.20016 Yes 5003209 Internet Explorer 11 on Windows 8.1 for x64-based systems 5003209 (Monthly Rollup) 5003165 (IE Cumulative) Critical Remote Code Execution 5001382 5000800 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C 6.3.9600.20017 6.3.9600.20016 Yes 5003209 Internet Explorer 11 on Windows RT 8.1 5003209 (Monthly Rollup) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 5003233 (Monthly Rollup) 5003165 (IE Cumulative) Critical Remote Code Execution 5001335 5000800 Base: 6.4 Temporal: 5.8 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C 6.1.7601.24597 6.1 Yes 5003233 Internet Explorer 11 on Windows Server 2012 5003208 (Monthly Rollup) 5003165 (IE Cumulative) Critical Remote Code Execution 5001387 5000800 Base: 6.4 Temporal: 5.8 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C 6.2.9200.23347 6.2 Yes 5003208 Internet Explorer 11 on Windows Server 2012 R2 5003209 (Monthly Rollup) 5003165 (IE Cumulative) Critical Remote Code Execution 5001382 5000800 Base: 6.4 Temporal: 5.8 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C 6.3.9600.20017 6.3.9600.20016 Yes 5003209 Internet Explorer 11 on Windows Server 2016 5003197 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows Server 2019 5003171 (Security Update) Critical Remote Code Execution Yes

Patches

7 patches
Article Type Restart
5003172 Security Update Yes
5003197 Security Update Yes
5003174 Security Update Yes
5003171 Security Update Yes
5003169 Security Update Yes
5003173 Security Update Yes
5003209 Monthly Rollup Yes

Known Exploits

Acknowledgments

Google Project Zero

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