CVE-2018-0949 — A security feature bypass vulnerability exists when Microsoft Internet Explorer improperly handles requests involving UNC resources, aka "Internet Explorer Security Feature Bypass Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10

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MEDIUM

A security feature bypass vulnerability exists when Microsoft Internet Explorer improperly handles requests involving UNC resources, aka "Internet Explorer Security Feature Bypass Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10

Published Jul 11, 2018

6.5

MEDIUM

CVSS 3.0

EPSS 11.70%

Description

A security feature bypass vulnerability exists when Microsoft Internet Explorer improperly handles requests involving UNC resources, aka "Internet Explorer Security Feature Bypass 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 x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1803 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  Windows 10 Version 1803 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
  -
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 x64-based Systems	affected	-
Windows 10 Version 1803 for 32-bit Systems	affected	-
Windows 10 Version 1803 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	-

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

11.70% 0.11698

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

EPSS probability 0.11698

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 (42 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	11.70% (0.11698)	95.94th	v5 (v2026.06.15)
Sep 22, 2026	11.70% (0.11698)	95.87th	v5 (v2026.06.15)
Sep 21, 2026	9.31% (0.09312)	95.21th	v5 (v2026.06.15)
Sep 20, 2026	11.70% (0.11698)	95.87th	v5 (v2026.06.15)
Sep 6, 2026	10.98% (0.10978)	95.60th	v5 (v2026.06.15)
Sep 5, 2026	8.73% (0.08734)	94.86th	v5 (v2026.06.15)
Aug 30, 2026	10.98% (0.10978)	95.57th	v5 (v2026.06.15)
Aug 28, 2026	8.73% (0.08734)	94.83th	v5 (v2026.06.15)
Aug 24, 2026	10.98% (0.10978)	95.55th	v5 (v2026.06.15)
Aug 23, 2026	8.73% (0.08734)	94.81th	v5 (v2026.06.15)
Jun 15, 2026	10.98% (0.10978)	95.32th	v5 (v2026.06.15)
Jun 13, 2026	19.80% (0.19805)	95.61th	v4 (v2025.03.14)
Apr 2, 2026	24.68% (0.24680)	96.11th	v4 (v2025.03.14)
Jan 25, 2026	19.38% (0.19375)	95.20th	v4 (v2025.03.14)
Dec 27, 2025	25.17% (0.25169)	96.02th	v4 (v2025.03.14)
Nov 29, 2025	22.63% (0.22627)	95.63th	v4 (v2025.03.14)
Nov 21, 2025	27.63% (0.27632)	96.23th	v4 (v2025.03.14)
Nov 18, 2025	22.06% (0.22058)	95.40th	v4 (v2025.03.14)
Nov 2, 2025	27.63% (0.27632)	96.24th	v4 (v2025.03.14)
Jul 5, 2025	22.31% (0.22314)	95.53th	v4 (v2025.03.14)
Mar 30, 2025	17.90% (0.17897)	94.62th	v4 (v2025.03.14)
Mar 29, 2025	31.74% (0.31739)	94.97th	v4 (v2025.03.14)
Mar 17, 2025	17.90% (0.17897)	94.64th	v4 (v2025.03.14)
Dec 12, 2024	0.28% (0.00282)	69.38th	v3 (v2023.03.01)
Apr 25, 2024	0.28% (0.00282)	68.13th	v3 (v2023.03.01)
Feb 28, 2024	0.34% (0.00335)	70.57th	v3 (v2023.03.01)
Feb 8, 2024	0.35% (0.00348)	70.92th	v3 (v2023.03.01)
Dec 1, 2023	0.35% (0.00348)	68.51th	v3 (v2023.03.01)
Jul 8, 2023	0.43% (0.00435)	71.20th	v3 (v2023.03.01)
Jul 4, 2023	0.61% (0.00606)	75.64th	v3 (v2023.03.01)
May 8, 2023	0.60% (0.00597)	75.17th	v3 (v2023.03.01)
Mar 7, 2023	0.43% (0.00429)	70.45th	v3 (v2023.03.01)
Mar 6, 2023	6.42% (0.06416)	91.03th	v2 (v2022.01.01)
Oct 31, 2022	6.42% (0.06416)	90.76th	v2 (v2022.01.01)
May 23, 2022	5.85% (0.05853)	89.68th	v2 (v2022.01.01)
Apr 16, 2022	5.27% (0.05274)	88.85th	v2 (v2022.01.01)
Apr 1, 2022	4.79% (0.04794)	88.19th	v2 (v2022.01.01)
Feb 4, 2022	4.79% (0.04794)	74.58th	v2 (v2022.01.01)
Feb 3, 2022	8.76% (0.08756)	86.41th	v1
Jan 6, 2022	8.76% (0.08756)	86.25th	v1
Sep 1, 2021	8.76% (0.08756)	93.70th	v1
Apr 14, 2021	8.76% (0.08756)	0.00th	v1

Weaknesses (0)

No CWE recorded.

References (3)

http://www.securityfocus.com/bid/104622
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041258
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0949
x_refsource_CONFIRMPatchVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/104622		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041258		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0949		x_refsource_CONFIRMPatchVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner microsoft

Published Jul 11, 2018

Updated Aug 5, 2024

Reserved Dec 1, 2017

Link CVE-2018-0949

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-0949

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-0949