CVE-2020-0662 — Internet Connection Sharing Service Remote Code Execution Vulnerability

Executive Summary

A memory corruption vulnerability exists in the Internet Connection Sharing (ICS) service when an attacker sends specially crafted packets to the server. An attacker who successfully exploited the vulnerability could run arbitrary code on the server with elevated privileges. To exploit the vulnerability, an attacker could send a specially crafted packet to a DHCP server. The security update addresses the vulnerability by correcting how the Internet Connection Sharing (ICS) service handles network packets.

Overview

8.8

CVSS HIGH

Critical

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Feb 11 2020

Last Updated Feb 11 2020

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.13253 — 0.95889 percentile

NVD CVSS 8.8 HIGH — differs from MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

None

AVAILABILITY

High

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.7

EPSS Score

0.13253

probability of exploitation in the next 30 days

0.95889 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

14 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for x64-based Systems	`4537776 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1607 for x64-based Systems	`4537764 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1709 for x64-based Systems	`4537789 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1803 for x64-based Systems	`4537762 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1809 for x64-based Systems	`4532691 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1903 for x64-based Systems	`4532693 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1909 for x64-based Systems	`4532693 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 7 for x64-based Systems Service Pack 1 4537820 (Monthly Rollup) 4537813 (Security Only) Critical Remote Code Execution 4534310 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4537813 Windows 8.1 for x64-based systems 4537821 (Monthly Rollup) 4537803 (Security Only) Critical Remote Code Execution 4534297 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4537821 4537803 Windows Server 2008 for x64-based Systems Service Pack 2 4537810 (Monthly Rollup) 4537822 (Security Only) Critical Remote Code Execution 4534303 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4537810 (Monthly Rollup) 4537822 (Security Only) Critical Remote Code Execution 4534303 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4537820 (Monthly Rollup) 4537813 (Security Only) Critical Remote Code Execution 4534310 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4537813 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4537820 (Monthly Rollup) 4537813 (Security Only) Critical Remote Code Execution 4534310 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4537813 Windows Server 2012 4537814 (Monthly Rollup) 4537794 (Security Only) Critical Remote Code Execution 4534283 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4537814 4537794 Windows Server 2012 (Server Core installation) 4537814 (Monthly Rollup) 4537794 (Security Only) Critical Remote Code Execution 4534283 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4537814 4537794 Windows Server 2012 R2 4537821 (Monthly Rollup) 4537803 (Security Only) Critical Remote Code Execution 4534297 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4537821 4537803 Windows Server 2012 R2 (Server Core installation) 4537821 (Monthly Rollup) 4537803 (Security Only) Critical Remote Code Execution 4534297 Base: 8.6 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4537821 4537803 Windows Server 2016	`4537764 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2016 (Server Core installation)	`4537764 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2019	`4532691 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2019 (Server Core installation)	`4532691 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server, version 1803 (Server Core Installation)	`4537762 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server, version 1903 (Server Core installation)	`4532693 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server, version 1909 (Server Core installation)	`4532693 (Security Update)`	Critical	Remote Code Execution	Yes

Patches

6 patches

Article	Type	Restart
`4537776`	Security Update	Yes
`4537764`	Security Update	Yes
`4537789`	Security Update	Yes
`4537762`	Security Update	Yes
`4532691`	Security Update	Yes
`4532693`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Quan Luo and Zhiyi Zhang from Codesafe Team of Legendsec at Qi'anxin Group

References

MSRC Advisory MITRE NVD