CVE-2025-21283Network attack vector

Remote code execution via undisclosed content handling

Published Feb 6, 2025 · Updated Feb 26, 2026

Remote code execution in Microsoft Edge (Chromium-based) before 133.0.3065.51 allows remote attackers to execute code via unspecified vectors. Microsoft has not published the affected component or the incorrect operation performed while handling attacker-controlled input. Exploitation requires user interaction; the vendor's published vector reports confidentiality impact but no direct integrity or availability impact.

CVSS severity8.8
High
EPSS probability1.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft Edge (Chromium-based) before 133.0.3065.51 allows remote attackers to execute code via unspecified vectors. Microsoft has not published the affected component or the incorrect operation performed while handling attacker-controlled input. Exploitation requires user interaction; the vendor's published vector reports confidentiality impact but no direct integrity or availability impact.

The record

CVE
CVE-2025-21283
Published
Feb 6, 2025
Updated
Feb 26, 2026
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
CWE-1222, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1222Insufficient Granularity of Address Regions Protected by Register Locks
T1203Exploitation for Client Execution

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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