CVE-2026-85856: Internet Connection Sharing (ICS) Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Internet Connection Sharing (ICS) allows an authorized attacker to execute code over an adjacent network.
Other sources
Internet Connection Sharing (ICS) Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648
Event History
Frequently Asked Questions
Who is positioned to exploit this issue?
An attacker must be authorized and able to reach the affected system over an adjacent network. The provided data does not indicate that exploitation is possible from the broader internet.
What level of access does successful exploitation provide?
Successful exploitation allows code execution and has high potential impact on confidentiality, integrity, and availability. The attacker already needs low privileges before exploitation.
Which systems should be reviewed for exposure?
Review Microsoft Windows 10 and 11 systems, plus Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025 systems that use Internet Connection Sharing. The data does not state whether ICS is enabled by default or identify affected build versions.