What is CVE-2017-0222?

CVE-2017-0222 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2017-05-12.

How severe is CVE-2017-0222?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2017-0222 known to be exploited?

Yes. CVE-2017-0222 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-02-25), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Buffer overflow in Microsoft Internet Explorer

CVE-2017-0222

A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory, aka "Internet Explorer Memory Corruption Vulnerability." This CVE ID is unique from CVE-2017-0226.

Vulnerability class: Buffer Overflow

Published 2017-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.296 (98.2th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.296 · newest: 0.296 · change: 0.000

Affected products

Microsoft Internet Explorer — versions 9, 11
Microsoft Windows 10 1507
Microsoft Windows 10 1511
Microsoft Windows 10 1607
Microsoft Windows 10 1703
Microsoft Windows 7
Microsoft Windows 8.1
Microsoft Windows Rt 8.1
Microsoft Windows Server 2008 — versions r2
Microsoft Windows Server 2012 — versions r2

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-02-25. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-08-25.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0222 (Patch, Vendor Advisory)
www.securityfocus.com/bid/98127 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www.securitytracker.com/id/1038423 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2017-0222?: CVE-2017-0222 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2017-05-12.
How severe is CVE-2017-0222?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2017-0222 known to be exploited?: Yes. CVE-2017-0222 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-02-25), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.