CVE-2018-8631 — A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory, aka "Internet Explorer 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 when Internet Explorer improperly accesses objects in memory, aka "Internet Explorer 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 68.49%

Description

A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory, aka "Internet Explorer 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

68.49% 0.68493

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

EPSS probability 0.68493

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 (73 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	68.49% (0.68493)	99.32th	v5 (v2026.06.15)
Sep 22, 2026	68.49% (0.68493)	99.30th	v5 (v2026.06.15)
Sep 21, 2026	65.66% (0.65664)	99.26th	v5 (v2026.06.15)
Sep 6, 2026	68.49% (0.68493)	99.29th	v5 (v2026.06.15)
Sep 5, 2026	65.66% (0.65664)	99.24th	v5 (v2026.06.15)
Aug 30, 2026	68.49% (0.68493)	99.28th	v5 (v2026.06.15)
Aug 28, 2026	66.45% (0.66447)	99.25th	v5 (v2026.06.15)
Aug 24, 2026	69.21% (0.69214)	99.30th	v5 (v2026.06.15)
Aug 23, 2026	66.45% (0.66447)	99.25th	v5 (v2026.06.15)
Jun 15, 2026	69.21% (0.69214)	99.27th	v5 (v2026.06.15)
May 30, 2026	78.40% (0.78404)	99.05th	v4 (v2025.03.14)
Mar 4, 2026	79.99% (0.79991)	99.08th	v4 (v2025.03.14)
Mar 1, 2026	78.52% (0.78516)	99.02th	v4 (v2025.03.14)
Feb 4, 2026	79.99% (0.79991)	99.07th	v4 (v2025.03.14)
Feb 1, 2026	78.52% (0.78516)	99.00th	v4 (v2025.03.14)
Jan 23, 2026	79.99% (0.79991)	99.07th	v4 (v2025.03.14)
Jan 4, 2026	83.27% (0.83265)	99.24th	v4 (v2025.03.14)
Jan 1, 2026	82.10% (0.82100)	99.18th	v4 (v2025.03.14)
Dec 30, 2025	83.27% (0.83265)	99.24th	v4 (v2025.03.14)
Dec 4, 2025	80.08% (0.80079)	99.06th	v4 (v2025.03.14)
Dec 1, 2025	78.61% (0.78612)	98.99th	v4 (v2025.03.14)
Nov 21, 2025	80.08% (0.80079)	99.06th	v4 (v2025.03.14)
Nov 18, 2025	85.61% (0.85605)	99.46th	v4 (v2025.03.14)
Nov 4, 2025	79.66% (0.79665)	99.05th	v4 (v2025.03.14)
Nov 1, 2025	78.16% (0.78160)	98.97th	v4 (v2025.03.14)
Oct 4, 2025	80.40% (0.80401)	99.09th	v4 (v2025.03.14)
Oct 1, 2025	78.96% (0.78964)	99.03th	v4 (v2025.03.14)
Sep 27, 2025	80.40% (0.80401)	99.09th	v4 (v2025.03.14)
Sep 4, 2025	81.99% (0.81987)	99.17th	v4 (v2025.03.14)
Sep 1, 2025	80.70% (0.80698)	99.11th	v4 (v2025.03.14)
Aug 4, 2025	82.14% (0.82144)	99.16th	v4 (v2025.03.14)
Aug 1, 2025	80.87% (0.80870)	99.11th	v4 (v2025.03.14)
Jul 5, 2025	82.14% (0.82144)	99.15th	v4 (v2025.03.14)
Jul 1, 2025	80.87% (0.80870)	99.10th	v4 (v2025.03.14)
Jun 9, 2025	82.14% (0.82144)	99.15th	v4 (v2025.03.14)
May 4, 2025	83.77% (0.83770)	99.22th	v4 (v2025.03.14)
May 1, 2025	80.19% (0.80186)	99.04th	v4 (v2025.03.14)
Apr 18, 2025	83.77% (0.83770)	99.21th	v4 (v2025.03.14)
Apr 16, 2025	80.19% (0.80186)	99.03th	v4 (v2025.03.14)
Apr 15, 2025	83.77% (0.83770)	99.21th	v4 (v2025.03.14)
Apr 14, 2025	80.19% (0.80186)	99.07th	v4 (v2025.03.14)
Mar 29, 2025	83.77% (0.83770)	99.11th	v4 (v2025.03.14)
Mar 28, 2025	80.19% (0.80186)	99.06th	v4 (v2025.03.14)
Mar 17, 2025	83.77% (0.83770)	99.25th	v4 (v2025.03.14)
Feb 6, 2025	92.86% (0.92861)	99.27th	v3 (v2023.03.01)
Dec 17, 2024	95.03% (0.95032)	99.49th	v3 (v2023.03.01)
Dec 12, 2024	96.65% (0.96651)	99.70th	v3 (v2023.03.01)
May 4, 2024	96.76% (0.96760)	99.66th	v3 (v2023.03.01)
Mar 5, 2024	96.89% (0.96893)	99.69th	v3 (v2023.03.01)
Jan 28, 2024	96.76% (0.96764)	99.61th	v3 (v2023.03.01)
Dec 23, 2023	96.85% (0.96849)	99.62th	v3 (v2023.03.01)
Nov 2, 2023	96.82% (0.96821)	99.57th	v3 (v2023.03.01)
Oct 17, 2023	96.83% (0.96831)	99.57th	v3 (v2023.03.01)
Oct 1, 2023	96.90% (0.96898)	99.61th	v3 (v2023.03.01)
Sep 11, 2023	96.86% (0.96865)	99.57th	v3 (v2023.03.01)
Jul 27, 2023	96.90% (0.96898)	99.56th	v3 (v2023.03.01)
Jul 7, 2023	96.74% (0.96744)	99.48th	v3 (v2023.03.01)
Jun 24, 2023	96.83% (0.96833)	99.50th	v3 (v2023.03.01)
Jun 9, 2023	96.55% (0.96551)	99.37th	v3 (v2023.03.01)
May 9, 2023	96.64% (0.96644)	99.40th	v3 (v2023.03.01)
Apr 24, 2023	96.78% (0.96783)	99.45th	v3 (v2023.03.01)
Apr 6, 2023	96.69% (0.96695)	99.39th	v3 (v2023.03.01)
Mar 8, 2023	96.87% (0.96866)	99.45th	v3 (v2023.03.01)
Mar 7, 2023	96.89% (0.96895)	99.47th	v3 (v2023.03.01)
Mar 6, 2023	75.27% (0.75274)	99.33th	v2 (v2022.01.01)
Jan 11, 2023	75.27% (0.75274)	99.32th	v2 (v2022.01.01)
Nov 27, 2022	74.13% (0.74128)	99.28th	v2 (v2022.01.01)
Oct 24, 2022	74.73% (0.74731)	99.29th	v2 (v2022.01.01)
Jun 7, 2022	76.83% (0.76827)	99.35th	v2 (v2022.01.01)
Feb 4, 2022	78.13% (0.78125)	99.34th	v2 (v2022.01.01)
Feb 3, 2022	43.80% (0.43797)	98.85th	v1
Sep 1, 2021	43.80% (0.43797)	99.47th	v1
Apr 14, 2021	43.80% (0.43797)	0.00th	v1

Weaknesses (1)

CWE-787

Out-of-bounds Write

References (3)

http://www.securityfocus.com/bid/106118
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8631
x_refsource_CONFIRMPatchVendor Advisory
https://www.exploit-db.com/exploits/46001/
exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry

Link	Providers	Tags
http://www.securityfocus.com/bid/106118		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8631		x_refsource_CONFIRMPatchVendor Advisory
https://www.exploit-db.com/exploits/46001/		exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry

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-2018-8631

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-8631

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-8631