What is CVE-2017-11767?

CVE-2017-11767 is a critical-severity vulnerability in Microsoft Chakracore, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-11-02.

How severe is CVE-2017-11767?

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

Buffer overflow in Microsoft Chakracore

CVE-2017-11767

ChakraCore allows an attacker to gain the same user rights as the current user, due to the way that the ChakraCore scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability".

Vulnerability class: Buffer Overflow

Published 2017-11-02 · 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: 0.095 (95.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.095 · newest: 0.095 · change: 0.000

Affected products

Microsoft Chakracore
Microsoft Corporation Chakracore — versions ChakraCore

Weakness classification (CWE)

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

References

www.securitytracker.com/id/1039369 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/100838 (VDB Entry, Third Party Advisory, vdb-entry)
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11767 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2017-11767?: CVE-2017-11767 is a critical-severity vulnerability in Microsoft Chakracore, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-11-02.
How severe is CVE-2017-11767?: Critical severity. CVSS v3 base score is 9.8 out of 10.