CVE record · CVE-2021-26419

Scripting Engine Memory Corruption Vulnerability

CVSS 7.5 HighCriticalEPSS 0.23 · 97th percentile

Critical, because:

CVSS score 7.5 (7.0 or more) and EPSS 0.23 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the CVE Program (CNA: microsoft) at 11 May 2021, 19:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Microsoft	Internet Explorer 11	affected 1.0.0 to before 10.0.14393.4401 custom affected 1.0.0 to before 10.0.17134.2207 custom affected 1.0.0 to before 10.0.17763.1935 custom affected 1.0.0 to before 10.0.18363.1556 custom affected 1.0.0 to before 10.0.19041.982 custom affected 1.0.0 to before 10.0.10240.18931 custom affected 1.0.0 to before 6.1.7601.24597 custom affected 1.0.0 to before 6.1 custom affected 1.0.0 to before 6.3.9600.20017 custom affected 1.0.0 to before 6.3.9600.20016 custom affected 1.0.0 to before 6.2.9200.23347 custom affected 1.0.0 to before 6.2 custom
Microsoft	Internet Explorer 9	affected 1.0.0 to before 6.0.6003.21117 custom affected 1.0.0 to before 6.0 custom

Identifiers: CVE-2021-26419
CNA: microsoft
Tags: Microsoft Internet Explorer 11
Microsoft Internet Explorer 9
Published: 11 May 2021
Updated: 3 Aug 2024

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	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	CNA (microsoft)

CISA KEV Not listed.
EPSS 0.23, the 97th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 11 May 2021. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.