Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker authenticated on the domain could exploit this vulnerability by tricking a domain-joined user into sending a request to a malicious server via the Routing and Remote Access Service (RRAS) Snap-in. This could result in the server returning malicious data that might cause arbitrary code execution on the user's system.
Security updates
10.0.17763.8276 — https://support.microsoft.com/help/5073723
10.0.20348.4648 — https://support.microsoft.com/help/5073457
10.0.19044.6809 — https://support.microsoft.com/help/5073724
10.0.26100.32230 — https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da
10.0.26200.7623 — https://support.microsoft.com/help/5074109
10.0.22631.6491 — https://support.microsoft.com/help/5073455
10.0.25398.2092 — https://support.microsoft.com/help/5073450
10.0.14393.8783 — https://support.microsoft.com/help/5073722
6.0.6003.23717 — https://support.microsoft.com/help/5073697
6.0.6003.23717 — https://support.microsoft.com/help/5073700
6.1.7601.28117 — https://support.microsoft.com/help/5073695
6.1.7601.28117 — https://support.microsoft.com/help/5073699
6.2.9200.25868 — https://support.microsoft.com/help/5073698
6.3.9600.22968 — https://support.microsoft.com/help/5073696
Vulnerabilities 1
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High 8.8
Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-20868 Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20868
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss