CVE-2025-21267

Content spoofing via undisclosed security-check failure

Published Feb 6, 2025 · Updated Feb 13, 2026

Spoofing in Microsoft Edge (Chromium-based) before 133.0.3065.51 allows local users to misrepresent browser-displayed information. Microsoft identifies an improperly implemented standards security check but has not disclosed the affected component or erroneous operation. Exploitation requires local access and user interaction and is limited to low-impact confidentiality and integrity effects.

CVSS severity4.4
Medium
EPSS probability0.57%
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) before 133.0.3065.51 allows local users to misrepresent browser-displayed information. Microsoft identifies an improperly implemented standards security check but has not disclosed the affected component or erroneous operation. Exploitation requires local access and user interaction and is limited to low-impact confidentiality and integrity effects.

The record

CVE
CVE-2025-21267
Published
Feb 6, 2025
Updated
Feb 13, 2026
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
CWE-358
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=1.0.0.0 <133.0.3065.51

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge (Chromium-based)version=1.0.0.0 <133.0.3065.51

Published CVSS scores

4.4MicrosoftCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-358Improperly Implemented Security Check for Standard

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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