What is CVE-2016-0166?

CVE-2016-0166 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2016-04-12.

How severe is CVE-2016-0166?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Microsoft Internet Explorer

CVE-2016-0166

Microsoft Internet Explorer 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability."

Vulnerability class: Buffer Overflow

Published 2016-04-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.158 (96.8th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.158 · newest: 0.158 · change: 0.000

Affected products

Microsoft Internet Explorer — versions 11

Weakness classification (CWE)

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

References

www.zerodayinitiative.com/advisories/ZDI-16-230
www.securitytracker.com/id/1035521 (vdb-entry)
docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-037 (vendor-advisory)

Frequently asked questions

What is CVE-2016-0166?: CVE-2016-0166 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2016-04-12.
How severe is CVE-2016-0166?: High severity. CVSS v3 base score is 7.5 out of 10.