CVE-2018-8494 — A remote code execution vulnerability exists when the Microsoft XML Core Services MSXML parser processes user input, aka "MS XML Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers

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HIGH

A remote code execution vulnerability exists when the Microsoft XML Core Services MSXML parser processes user input, aka "MS XML Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers

Published Oct 10, 2018

8.8

HIGH

CVSS 3.0

EPSS 22.09%

Description

A remote code execution vulnerability exists when the Microsoft XML Core Services MSXML parser processes user input, aka "MS XML Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.

Affected products

Vendor Microsoft Product Windows 10 Default
n/a
- Version
  32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1607 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1607 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1703 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1703 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1709 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1709 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1803 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1803 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1809 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Version 1809 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  x64-based Systems
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows 10 Servers Default
n/a
- Version
  version 1709 (Server Core Installation)
  Status
  affected
  Constraints
  -
- Version
  version 1803 (Server Core Installation)
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows 7 Default
n/a
- Version
  32-bit Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows 8.1 Default
n/a
- Version
  32-bit systems
  Status
  affected
  Constraints
  -
- Version
  x64-based systems
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows RT 8.1 Default
n/a
- Version
  Windows RT 8.1
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows Server 2008 Default
n/a
- Version
  32-bit Systems Service Pack 2
  Status
  affected
  Constraints
  -
- Version
  32-bit Systems Service Pack 2 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  Itanium-Based Systems Service Pack 2
  Status
  affected
  Constraints
  -
- Version
  x64-based Systems Service Pack 2
  Status
  affected
  Constraints
  -
- Version
  x64-based Systems Service Pack 2 (Server Core installation)
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows Server 2008 R2 Default
n/a
- Version
  Itanium-Based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  x64-based Systems Service Pack 1 (Server Core installation)
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows Server 2012 Default
n/a
- Version
  (Server Core installation)
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows Server 2012 R2 Default
n/a
- Version
  (Server Core installation)
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows Server 2016 Default
n/a
- Version
  (Server Core installation)
  Status
  affected
  Constraints
  -
Vendor Microsoft Product Windows Server 2019 Default
n/a
- Version
  (Server Core installation)
  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

Windows 10

n/a

Version	Status	Constraints
32-bit Systems	affected	-
Version 1607 for 32-bit Systems	affected	-
Version 1607 for x64-based Systems	affected	-
Version 1703 for 32-bit Systems	affected	-
Version 1703 for x64-based Systems	affected	-
Version 1709 for 32-bit Systems	affected	-
Version 1709 for x64-based Systems	affected	-
Version 1803 for 32-bit Systems	affected	-
Version 1803 for x64-based Systems	affected	-
Version 1809 for 32-bit Systems	affected	-
Version 1809 for x64-based Systems	affected	-
x64-based Systems	affected	-

Microsoft

Windows 10 Servers

n/a

Version	Status	Constraints
version 1709 (Server Core Installation)	affected	-
version 1803 (Server Core Installation)	affected	-

Microsoft

Windows 7

n/a

Version	Status	Constraints
32-bit Systems Service Pack 1	affected	-
x64-based Systems Service Pack 1	affected	-

Microsoft

Windows 8.1

n/a

Version	Status	Constraints
32-bit systems	affected	-
x64-based systems	affected	-

Microsoft

Windows RT 8.1

n/a

Version	Status	Constraints
Windows RT 8.1	affected	-

Microsoft

Windows Server 2008

n/a

Version	Status	Constraints
32-bit Systems Service Pack 2	affected	-
32-bit Systems Service Pack 2 (Server Core installation)	affected	-
Itanium-Based Systems Service Pack 2	affected	-
x64-based Systems Service Pack 2	affected	-
x64-based Systems Service Pack 2 (Server Core installation)	affected	-

Microsoft

Windows Server 2008 R2

n/a

Version	Status	Constraints
Itanium-Based Systems Service Pack 1	affected	-
x64-based Systems Service Pack 1	affected	-
x64-based Systems Service Pack 1 (Server Core installation)	affected	-

Microsoft

Windows Server 2012

n/a

Version	Status	Constraints
(Server Core installation)	affected	-

Microsoft

Windows Server 2012 R2

n/a

Version	Status	Constraints
(Server Core installation)	affected	-

Microsoft

Windows Server 2016

n/a

Version	Status	Constraints
(Server Core installation)	affected	-

Microsoft

Windows Server 2019

n/a

Version	Status	Constraints
(Server Core installation)	affected	-

Remediation

No remediation recorded yet.

Metrics

22.09% 0.22094

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.22094

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 (52 key points)

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

Date	Score	Percentile	Model
Oct 2, 2026	22.09% (0.22094)	97.60th	v5 (v2026.06.15)
Sep 22, 2026	22.09% (0.22094)	97.56th	v5 (v2026.06.15)
Sep 21, 2026	19.65% (0.19647)	97.33th	v5 (v2026.06.15)
Sep 6, 2026	22.09% (0.22094)	97.50th	v5 (v2026.06.15)
Sep 5, 2026	19.65% (0.19647)	97.27th	v5 (v2026.06.15)
Aug 30, 2026	22.09% (0.22094)	97.49th	v5 (v2026.06.15)
Aug 28, 2026	19.73% (0.19731)	97.26th	v5 (v2026.06.15)
Aug 24, 2026	22.19% (0.22187)	97.49th	v5 (v2026.06.15)
Aug 23, 2026	19.73% (0.19731)	97.25th	v5 (v2026.06.15)
Jun 15, 2026	22.19% (0.22187)	97.37th	v5 (v2026.06.15)
May 19, 2026	30.84% (0.30837)	96.79th	v4 (v2025.03.14)
Apr 26, 2026	40.31% (0.40308)	97.36th	v4 (v2025.03.14)
Apr 3, 2026	41.43% (0.41430)	97.39th	v4 (v2025.03.14)
Mar 28, 2026	45.69% (0.45689)	97.59th	v4 (v2025.03.14)
Mar 17, 2026	40.41% (0.40408)	97.30th	v4 (v2025.03.14)
Feb 28, 2026	47.07% (0.47072)	97.61th	v4 (v2025.03.14)
Feb 1, 2026	42.47% (0.42466)	97.38th	v4 (v2025.03.14)
Nov 21, 2025	36.00% (0.36000)	96.91th	v4 (v2025.03.14)
Nov 18, 2025	22.41% (0.22415)	95.45th	v4 (v2025.03.14)
Oct 4, 2025	36.00% (0.36000)	96.96th	v4 (v2025.03.14)
Sep 10, 2025	24.31% (0.24306)	95.88th	v4 (v2025.03.14)
Mar 30, 2025	25.32% (0.25317)	95.75th	v4 (v2025.03.14)
Mar 29, 2025	26.59% (0.26589)	94.11th	v4 (v2025.03.14)
Mar 17, 2025	25.32% (0.25317)	95.75th	v4 (v2025.03.14)
Dec 17, 2024	69.83% (0.69826)	98.20th	v3 (v2023.03.01)
Sep 19, 2024	15.08% (0.15077)	95.92th	v3 (v2023.03.01)
Aug 19, 2024	17.03% (0.17030)	96.17th	v3 (v2023.03.01)
Jul 25, 2024	19.56% (0.19565)	96.35th	v3 (v2023.03.01)
Jun 25, 2024	25.08% (0.25079)	96.71th	v3 (v2023.03.01)
May 29, 2024	24.79% (0.24790)	96.66th	v3 (v2023.03.01)
Mar 23, 2024	25.58% (0.25583)	96.59th	v3 (v2023.03.01)
Mar 2, 2024	23.78% (0.23778)	96.44th	v3 (v2023.03.01)
Jan 19, 2024	25.85% (0.25846)	96.28th	v3 (v2023.03.01)
Oct 4, 2023	24.73% (0.24729)	96.07th	v3 (v2023.03.01)
Jul 11, 2023	24.58% (0.24584)	96.00th	v3 (v2023.03.01)
Jul 8, 2023	34.22% (0.34216)	96.49th	v3 (v2023.03.01)
Jun 27, 2023	27.39% (0.27394)	96.15th	v3 (v2023.03.01)
Apr 23, 2023	24.47% (0.24471)	95.91th	v3 (v2023.03.01)
Mar 7, 2023	23.11% (0.23106)	95.75th	v3 (v2023.03.01)
Mar 6, 2023	34.60% (0.34599)	97.77th	v2 (v2022.01.01)
Jan 31, 2023	34.60% (0.34599)	97.75th	v2 (v2022.01.01)
Nov 10, 2022	32.42% (0.32419)	97.57th	v2 (v2022.01.01)
Sep 26, 2022	31.10% (0.31104)	97.47th	v2 (v2022.01.01)
Aug 23, 2022	27.14% (0.27139)	97.04th	v2 (v2022.01.01)
Jul 17, 2022	23.10% (0.23099)	96.62th	v2 (v2022.01.01)
Apr 6, 2022	21.36% (0.21361)	96.28th	v2 (v2022.01.01)
Apr 1, 2022	17.27% (0.17269)	95.90th	v2 (v2022.01.01)
Feb 4, 2022	17.27% (0.17269)	93.17th	v2 (v2022.01.01)
Feb 3, 2022	17.55% (0.17549)	91.03th	v1
Jan 6, 2022	17.55% (0.17549)	90.92th	v1
Sep 1, 2021	17.55% (0.17549)	97.67th	v1
Apr 14, 2021	17.55% (0.17549)	0.00th	v1

Weaknesses (1)

CWE-611

XXE

References (3)

http://www.securityfocus.com/bid/105457
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041844
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8494
x_refsource_CONFIRMPatchVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/105457		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041844		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8494		x_refsource_CONFIRMPatchVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner microsoft

Published Oct 10, 2018

Updated Aug 5, 2024

Reserved Mar 14, 2018

Link CVE-2018-8494

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-8494

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-8494