CVE-2021-41351Network attack vector

User-assisted content spoofing

Published Nov 10, 2021 · Updated Aug 19, 2026

Spoofing in Microsoft Edge (Chromium-based) in IE Mode allows remote attackers to misrepresent displayed content after user interaction. Microsoft has not publicly described the flawed operation or request-handling locus that permits the spoofing. Exposure requires a site to load through Windows-only IE Mode, and the published impact is limited to displayed-information confidentiality.

CVSS severity4.3
Medium
EPSS probability3.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Spoofing in Microsoft Edge (Chromium-based) in IE Mode allows remote attackers to misrepresent displayed content after user interaction. Microsoft has not publicly described the flawed operation or request-handling locus that permits the spoofing. Exposure requires a site to load through Windows-only IE Mode, and the published impact is limited to displayed-information confidentiality.

The record

CVE
CVE-2021-41351
Published
Nov 10, 2021
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0.0 <10.0.17763.2300

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge (Chromium-based)version=10.0.0.0 <10.0.17763.2300

Published CVSS scores

4.3Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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