What is CVE-2017-0223?

CVE-2017-0223 is a critical-severity vulnerability in Microsoft Edge, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-05-15.

How severe is CVE-2017-0223?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Microsoft Edge

CVE-2017-0223

A remote code execution vulnerability exists in Microsoft Chakra Core in the way JavaScript engines render when handling objects in memory. aka "Scripting Engine Memory Corruption Vulnerability". This vulnerability is unique from CVE-2017-0252.

Vulnerability class: Buffer Overflow

Published 2017-05-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.147 (96.6th percentile), scored 2026-10-06.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.147 · newest: 0.147 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

github.com/Microsoft/ChakraCore/pull/2959 (Patch, Third Party Advisory)
www.securitytracker.com/id/1038425 (vdb-entry)

Frequently asked questions

What is CVE-2017-0223?: CVE-2017-0223 is a critical-severity vulnerability in Microsoft Edge, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-05-15.
How severe is CVE-2017-0223?: Critical severity. CVSS v3 base score is 9.8 out of 10.