What is CVE-2018-0955?

CVE-2018-0955 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2018-05-09.

How severe is CVE-2018-0955?

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

Is CVE-2018-0955 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Microsoft Internet Explorer

CVE-2018-0955

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-0945, CVE-2018-0946, CVE-2018-0951, CVE-2018-0953, CVE-2018-0954, CVE-2018-1022, CVE-2018-8114, CVE-2018-8122, CVE-2018-8128, CVE-2018-8137, CVE-2018-8139.

Vulnerability class: Buffer Overflow

Published 2018-05-09 · 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: 0.160 (96.8th percentile), scored 2026-10-02.

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: 0.160 · change: +0.002

Affected products

Microsoft Internet Explorer — versions 9, 10, 11
Microsoft Internet Explorer 10 — versions Windows Server 2012
Microsoft Internet Explorer 11 — versions Windows 10 Version 1803 for 32-bit Systems, Windows 10 Version 1703 for x64-based Systems, Windows 8.1 for x64-based systems
Microsoft Internet Explorer 9 — versions Windows Server 2008 for 32-bit Systems Service Pack 2, Windows Server 2008 for x64-based Systems Service Pack 2

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0955 (Patch, Vendor Advisory)
www.securitytracker.com/id/1040846 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/103993 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-0955?: CVE-2018-0955 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2018-05-09.
How severe is CVE-2018-0955?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2018-0955 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.