Heap-Based Buffer Overflow in Windows Routing and Remote Access Service by Microsoft
CVE-2026-20868

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Vendor
CVE Published:
13 January 2026

What is CVE-2026-20868?

A heap-based buffer overflow in the Windows Routing and Remote Access Service (RRAS) poses a significant risk, allowing unauthorized attackers to execute arbitrary code via network interactions. This vulnerability can potentially compromise system security, enabling malicious activities that exploit this weakness. Users and administrators are encouraged to review the latest security updates from Microsoft to mitigate associated risks.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.8783

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8276

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.6809

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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