What is CVE-2014-4066?

CVE-2014-4066 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 2018-02-08.

How severe is CVE-2014-4066?

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

Buffer overflow in Microsoft Internet Explorer

CVE-2014-4066

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," a different vulnerability than CVE-2014-2787, CVE-2014-2790, CVE-2014-2802, and CVE-2014-2806.

Vulnerability class: Buffer Overflow

Published 2018-02-08 · 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: 0.077 (94.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.077 · newest: 0.077 · 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

docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-037 (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2014-4066?: CVE-2014-4066 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 2018-02-08.
How severe is CVE-2014-4066?: High severity. CVSS v3 base score is 7.5 out of 10.