What is CVE-2023-27117?

CVE-2023-27117 is a high-severity vulnerability in Webassembly, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2023-03-10.

How severe is CVE-2023-27117?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Webassembly

CVE-2023-27117

WebAssembly v1.0.29 was discovered to contain a heap overflow via the component component wabt::Node::operator.

Vulnerability class: Buffer Overflow

Published 2023-03-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.7th percentile), scored 2026-10-08.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Webassembly — versions 1.0.29

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/WebAssembly/wabt/issues/1989 (Exploit, Issue Tracking)

Frequently asked questions

What is CVE-2023-27117?: CVE-2023-27117 is a high-severity vulnerability in Webassembly, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2023-03-10.
How severe is CVE-2023-27117?: High severity. CVSS v3 base score is 7.8 out of 10.