CVE-2024-21383

Content spoofing via improper signature verification

Published Jan 26, 2024 · Updated May 3, 2025

Spoofing in Microsoft Edge before 121.0.2277.83 allows local users to alter presented identity information after user interaction. Microsoft classifies the issue as improper verification of a cryptographic signature but has not disclosed the affected Edge component, signed input, or incorrect verification operation. Exploitation requires a local user-interaction path and has a limited integrity impact, with no published confidentiality or availability impact.

CVSS severity3.3
Low
EPSS probability0.41%
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 before 121.0.2277.83 allows local users to alter presented identity information after user interaction. Microsoft classifies the issue as improper verification of a cryptographic signature but has not disclosed the affected Edge component, signed input, or incorrect verification operation. Exploitation requires a local user-interaction path and has a limited integrity impact, with no published confidentiality or availability impact.

The record

CVE
CVE-2024-21383
Published
Jan 26, 2024
Updated
May 3, 2025
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
CWE-347, CAPEC-475
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 2024CVE publishedPublication date reported by the CVE source.
  2. May 3, 2025Record 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 <121.0.2277.83

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge (Chromium-based)version=1.0.0 <121.0.2277.83

Published CVSS scores

3.3MicrosoftCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/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-347Improper Verification of Cryptographic Signature
CAPEC-475Signature Spoofing by Improper Validation

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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