CVE-2018-8335 — A denial of service vulnerability exists in the Microsoft Server Block Message (SMB) when an attacker sends specially crafted requests to the server, aka "Windows SMB Denial of Service Vulnerability." This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2012, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers

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HIGH

A denial of service vulnerability exists in the Microsoft Server Block Message (SMB) when an attacker sends specially crafted requests to the server, aka "Windows SMB Denial of Service Vulnerability." This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2012, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers

Published Sep 13, 2018

7.5

HIGH

CVSS 3.0

EPSS 9.00%

Description

A denial of service vulnerability exists in the Microsoft Server Block Message (SMB) when an attacker sends specially crafted requests to the server, aka "Windows SMB Denial of Service Vulnerability." This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2012, Windows Server 2016, Windows 8.1, 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
  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 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 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
  -

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	-
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 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 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	-

Remediation

No remediation recorded yet.

Metrics

9.00% 0.08997

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

EPSS probability 0.08997

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 (33 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	9.00% (0.08997)	95.12th	v5 (v2026.06.15)
Jun 15, 2026	9.00% (0.08997)	94.59th	v5 (v2026.06.15)
Jun 5, 2026	21.78% (0.21784)	95.86th	v4 (v2025.03.14)
Mar 1, 2026	17.79% (0.17794)	95.03th	v4 (v2025.03.14)
Jan 5, 2026	14.37% (0.14372)	94.19th	v4 (v2025.03.14)
Nov 15, 2025	11.11% (0.11112)	93.15th	v4 (v2025.03.14)
Sep 7, 2025	9.65% (0.09653)	92.60th	v4 (v2025.03.14)
Mar 30, 2025	5.85% (0.05855)	89.61th	v4 (v2025.03.14)
Mar 29, 2025	14.54% (0.14535)	90.78th	v4 (v2025.03.14)
Mar 19, 2025	5.85% (0.05855)	89.36th	v4 (v2025.03.14)
Mar 17, 2025	14.34% (0.14337)	93.89th	v4 (v2025.03.14)
Dec 12, 2024	0.46% (0.00459)	76.16th	v3 (v2023.03.01)
Jun 28, 2024	0.46% (0.00459)	75.54th	v3 (v2023.03.01)
Mar 15, 2024	0.39% (0.00388)	72.64th	v3 (v2023.03.01)
Feb 14, 2024	0.37% (0.00368)	71.78th	v3 (v2023.03.01)
Feb 3, 2024	0.37% (0.00368)	69.77th	v3 (v2023.03.01)
Oct 11, 2023	0.46% (0.00461)	72.54th	v3 (v2023.03.01)
Sep 6, 2023	0.47% (0.00468)	72.50th	v3 (v2023.03.01)
Jul 19, 2023	0.44% (0.00442)	71.49th	v3 (v2023.03.01)
Jul 8, 2023	0.63% (0.00627)	76.13th	v3 (v2023.03.01)
May 30, 2023	0.89% (0.00891)	80.32th	v3 (v2023.03.01)
Mar 7, 2023	1.26% (0.01260)	83.45th	v3 (v2023.03.01)
Mar 6, 2023	6.42% (0.06416)	91.03th	v2 (v2022.01.01)
Jan 3, 2023	6.42% (0.06416)	90.61th	v2 (v2022.01.01)
Jul 26, 2022	5.85% (0.05853)	89.97th	v2 (v2022.01.01)
Jun 19, 2022	5.27% (0.05274)	89.02th	v2 (v2022.01.01)
Apr 1, 2022	4.79% (0.04794)	88.19th	v2 (v2022.01.01)
Mar 9, 2022	4.79% (0.04794)	74.96th	v2 (v2022.01.01)
Feb 4, 2022	4.00% (0.04004)	67.82th	v2 (v2022.01.01)
Feb 3, 2022	10.69% (0.10686)	87.85th	v1
Jan 6, 2022	10.69% (0.10686)	87.71th	v1
Sep 1, 2021	10.69% (0.10686)	95.19th	v1
Apr 14, 2021	10.69% (0.10686)	0.00th	v1

Weaknesses (0)

No CWE recorded.

References (3)

http://www.securityfocus.com/bid/105224
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041634
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8335
x_refsource_CONFIRMPatchVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/105224		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041634		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8335		x_refsource_CONFIRMPatchVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner microsoft

Published Sep 13, 2018

Updated Aug 5, 2024

Reserved Mar 14, 2018

Link CVE-2018-8335

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-8335

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-8335