What is CVE-2023-51661?

CVE-2023-51661 is a high-severity vulnerability in Wasmer, classified under Improper Access Control. CVSS score: 8.4/10. Published 2023-12-22.

How severe is CVE-2023-51661?

High severity. CVSS v3 base score is 8.4 out of 10.

Vulnerability in Wasmer

CVE-2023-51661

Wasmer is a WebAssembly runtime that enables containers to run anywhere: from Desktop to the Cloud, Edge and even the browser. Wasm programs can access the filesystem outside of the sandbox. Service providers running untrusted Wasm code on Wasmer can unexpectedly expose the host filesystem. This vulnerability has been patched in version 4.2.4.

Published 2023-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.5th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Wasmer
Wasmerio Wasmer — versions >= 3.0.0, < 4.2.4

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

github.com/wasmerio/wasmer/security/advisories/GHSA-4mq4-7rw3-vm5j (Exploit, Vendor Advisory)
github.com/wasmerio/wasmer/issues/4267 (Issue Tracking)
github.com/wasmerio/wasmer/commit/4d63febf9d8b257b0531963b85df48d45d0dbf3c (Patch)

Frequently asked questions

What is CVE-2023-51661?: CVE-2023-51661 is a high-severity vulnerability in Wasmer, classified under Improper Access Control. CVSS score: 8.4/10. Published 2023-12-22.
How severe is CVE-2023-51661?: High severity. CVSS v3 base score is 8.4 out of 10.