CVE-2025-29815Network attack vector

Authenticated code execution via undisclosed use-after-free

Published Apr 4, 2025 · Updated Aug 10, 2026

Use-after-free in Microsoft Edge (Chromium-based) before 134.0.3124.66 allows remote authenticated users to execute code. Microsoft has not disclosed the affected Edge component, the freed object's lifetime error, or the input that triggers the stale reference. Exploitation requires user interaction and low privileges; successful abuse can execute code in the browser context, expose or modify data, or interrupt service.

CVSS severity7.6
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Microsoft Edge (Chromium-based) before 134.0.3124.66 allows remote authenticated users to execute code. Microsoft has not disclosed the affected Edge component, the freed object's lifetime error, or the input that triggers the stale reference. Exploitation requires user interaction and low privileges; successful abuse can execute code in the browser context, expose or modify data, or interrupt service.

The record

CVE
CVE-2025-29815
Published
Apr 4, 2025
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
CWE-416, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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 <134.0.3124.66

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft Edge (Chromium-based)version=1.0.0.0 <134.0.3124.66

Published CVSS scores

7.6Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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