CVE-2018-8643 — 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

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HIGH

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

Published Dec 12, 2018

7.5

HIGH

CVSS 3.0

EPSS 9.91%

Description

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.

Affected products

Vendor Microsoft Product Internet Explorer 10 Default
n/a
- Version
  Windows Server 2012
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Internet Explorer 11 Default
n/a
- Version
  Windows 10 Version 1607 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1607 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1703 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1703 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1709 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1709 for ARM64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1709 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1803 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1803 for ARM64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1803 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1809 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1809 for ARM64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1809 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 7 for 32-bit Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  Windows 7 for x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  Windows 8.1 for 32-bit systems
  Status
  affected
  Constraints
  -
- Version
  Windows 8.1 for x64-based systems
  Status
  affected
  Constraints
  -
- Version
  Windows RT 8.1
  Status
  affected
  Constraints
  -
- Version
  Windows Server 2008 R2 for x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  Windows Server 2012 R2
  Status
  affected
  Constraints
  -
- Version
  Windows Server 2016
  Status
  affected
  Constraints
  -
- Version
  Windows Server 2019
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Internet Explorer 9 Default
n/a
- Version
  Windows Server 2008 for 32-bit Systems Service Pack 2
  Status
  affected
  Constraints
  -
- Version
  Windows Server 2008 for x64-based Systems Service Pack 2
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Microsoft

Internet Explorer 10

n/a

Version	Status	Constraints
Windows Server 2012	affected	-

Microsoft

Internet Explorer 11

n/a

Version	Status	Constraints
Windows 10 Version 1607 for 32-bit Systems	affected	-
Windows 10 Version 1607 for x64-based Systems	affected	-
Windows 10 Version 1703 for 32-bit Systems	affected	-
Windows 10 Version 1703 for x64-based Systems	affected	-
Windows 10 Version 1709 for 32-bit Systems	affected	-
Windows 10 Version 1709 for ARM64-based Systems	affected	-
Windows 10 Version 1709 for x64-based Systems	affected	-
Windows 10 Version 1803 for 32-bit Systems	affected	-
Windows 10 Version 1803 for ARM64-based Systems	affected	-
Windows 10 Version 1803 for x64-based Systems	affected	-
Windows 10 Version 1809 for 32-bit Systems	affected	-
Windows 10 Version 1809 for ARM64-based Systems	affected	-
Windows 10 Version 1809 for x64-based Systems	affected	-
Windows 10 for 32-bit Systems	affected	-
Windows 10 for x64-based Systems	affected	-
Windows 7 for 32-bit Systems Service Pack 1	affected	-
Windows 7 for x64-based Systems Service Pack 1	affected	-
Windows 8.1 for 32-bit systems	affected	-
Windows 8.1 for x64-based systems	affected	-
Windows RT 8.1	affected	-
Windows Server 2008 R2 for x64-based Systems Service Pack 1	affected	-
Windows Server 2012 R2	affected	-
Windows Server 2016	affected	-
Windows Server 2019	affected	-

Microsoft

Internet Explorer 9

n/a

Version	Status	Constraints
Windows Server 2008 for 32-bit Systems Service Pack 2	affected	-
Windows Server 2008 for x64-based Systems Service Pack 2	affected	-

Remediation

No remediation recorded yet.

Metrics

9.91% 0.09906

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.09906

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (39 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	9.91% (0.09906)	95.44th	v5 (v2026.06.15)
Jun 15, 2026	9.91% (0.09906)	94.96th	v5 (v2026.06.15)
May 2, 2026	15.42% (0.15416)	94.67th	v4 (v2025.03.14)
Apr 5, 2026	12.37% (0.12370)	93.86th	v4 (v2025.03.14)
Dec 6, 2025	9.41% (0.09408)	92.49th	v4 (v2025.03.14)
Oct 20, 2025	5.65% (0.05646)	89.88th	v4 (v2025.03.14)
Mar 30, 2025	4.58% (0.04581)	88.19th	v4 (v2025.03.14)
Mar 29, 2025	43.97% (0.43966)	96.34th	v4 (v2025.03.14)
Mar 17, 2025	4.32% (0.04318)	88.14th	v4 (v2025.03.14)
Dec 17, 2024	10.69% (0.10690)	95.05th	v3 (v2023.03.01)
Nov 21, 2024	23.67% (0.23673)	96.74th	v3 (v2023.03.01)
Oct 21, 2024	17.86% (0.17862)	96.26th	v3 (v2023.03.01)
Aug 27, 2024	10.49% (0.10487)	95.11th	v3 (v2023.03.01)
May 25, 2024	7.69% (0.07688)	94.16th	v3 (v2023.03.01)
May 4, 2024	7.50% (0.07501)	94.09th	v3 (v2023.03.01)
Mar 22, 2024	7.82% (0.07819)	94.06th	v3 (v2023.03.01)
Feb 16, 2024	5.68% (0.05676)	93.03th	v3 (v2023.03.01)
Jan 28, 2024	7.82% (0.07819)	93.61th	v3 (v2023.03.01)
Jul 7, 2023	5.68% (0.05676)	92.22th	v3 (v2023.03.01)
Jun 24, 2023	12.67% (0.12665)	94.66th	v3 (v2023.03.01)
Jun 9, 2023	10.34% (0.10342)	94.13th	v3 (v2023.03.01)
May 24, 2023	22.36% (0.22359)	95.78th	v3 (v2023.03.01)
Apr 24, 2023	8.25% (0.08253)	93.36th	v3 (v2023.03.01)
Apr 6, 2023	9.75% (0.09748)	93.86th	v3 (v2023.03.01)
Mar 22, 2023	16.86% (0.16855)	95.18th	v3 (v2023.03.01)
Mar 8, 2023	9.76% (0.09759)	93.84th	v3 (v2023.03.01)
Mar 7, 2023	17.53% (0.17530)	95.23th	v3 (v2023.03.01)
Mar 6, 2023	13.37% (0.13370)	95.72th	v2 (v2022.01.01)
Jan 11, 2023	13.37% (0.13370)	95.52th	v2 (v2022.01.01)
Nov 27, 2022	12.68% (0.12683)	95.42th	v2 (v2022.01.01)
Oct 24, 2022	10.70% (0.10702)	94.50th	v2 (v2022.01.01)
Sep 17, 2022	8.36% (0.08358)	93.33th	v2 (v2022.01.01)
Jun 7, 2022	7.62% (0.07619)	92.36th	v2 (v2022.01.01)
Apr 1, 2022	5.96% (0.05960)	89.66th	v2 (v2022.01.01)
Feb 4, 2022	5.96% (0.05960)	77.50th	v2 (v2022.01.01)
Feb 3, 2022	11.50% (0.11504)	88.31th	v1
Jan 6, 2022	11.50% (0.11504)	88.17th	v1
Sep 1, 2021	11.50% (0.11504)	95.62th	v1
Apr 14, 2021	11.50% (0.11504)	0.00th	v1

Weaknesses (1)

CWE-787

Out-of-bounds Write

References (2)

http://www.securityfocus.com/bid/106117
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8643
x_refsource_CONFIRMPatchVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/106117		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8643		x_refsource_CONFIRMPatchVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner microsoft

Published Dec 12, 2018

Updated Aug 5, 2024

Reserved Mar 14, 2018

Link CVE-2018-8643

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-8643

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-8643