Is CVE-2025-66627 actively exploited?

No active exploitation of CVE-2025-66627 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-66627 be exploited remotely?

No. CVE-2025-66627 requires local access to exploit.

What is the CVSS score of CVE-2025-66627?

CVE-2025-66627 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2025-66627

HIGH

CVE-2025-66627

CWE-416Published: December 9, 2025· Updated: Jun 17, 2026

7.8

CVSS v3.1

Official Description

Wasmi is a WebAssembly interpreter focused on constrained and embedded systems. In versions 0.41.0, 0.41.1, 0.42.0 through 0.47.1, 0.50.0 through 0.51.2 and 1.0.0, Wasmi's linear memory implementation leads to a Use After Free vulnerability, triggered by a WebAssembly module under certain memory growth conditions. This issue potentially leads to memory corruption, information disclosure, or code execution. This issue is fixed in versions 0.41.2, 0.47.1, 0.51.3 and 1.0.1. To workaround this issue, consider limiting the maximum linear memory sizes where feasible.

NVD Source

Technical Analysis

CVE-2025-66627 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.