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CVE-2025-29815: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

• Severity: high (CVSS 7.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-04 · updated 2026-08-10
• Weakness: CWE-416

Description

Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.

Affected products

• Microsoft Edge (Chromium): before 134.0.3124.66 — fixed in 134.0.3124.66
• Microsoft Edge (Chromium): from 1.0.0.0 before 134.0.3124.66 — fixed in 134.0.3124.66

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 134.0.3124.66; Microsoft Edge (Chromium) 134.0.3124.66. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29815

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