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NVD Vulnerability Details :
CVE-2026-20868
Modified
More InfoOfficial Page
Source-secure@microsoft.com
View Known Exploited Vulnerability (KEV) details
Published At-13 Jan, 2026 | 18:16
Updated At-10 Feb, 2026 | 15:16

Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.8HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 8.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CPE Matches
Microsoft Corporation
microsoft
>>windows_10_1607>>Versions before 10.0.14393.8783(exclusive)
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_10_1607>>Versions before 10.0.14393.8783(exclusive)
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
Microsoft Corporation
microsoft
>>windows_10_1809>>Versions before 10.0.17763.8276(exclusive)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_10_1809>>Versions before 10.0.17763.8276(exclusive)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
Microsoft Corporation
microsoft
>>windows_10_21h2>>Versions before 10.0.19044.6809(exclusive)
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_10_22h2>>Versions before 10.0.19045.6809(exclusive)
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_11_23h2>>Versions before 10.0.22631.6491(exclusive)
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_11_24h2>>Versions before 10.0.26100.7623(exclusive)
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_11_25h2>>Versions before 10.0.26200.7623(exclusive)
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2008>>-
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_server_2008>>-
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:*
Microsoft Corporation
microsoft
>>windows_server_2008>>r2
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_server_2012>>-
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2012>>r2
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2016>>Versions before 10.0.14393.8783(exclusive)
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2019>>Versions before 10.0.17763.8276(exclusive)
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2022>>Versions before 10.0.20348.4648(exclusive)
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2022_23h2>>Versions before 10.0.25398.2092(exclusive)
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2025>>Versions before 10.0.26100.32230(exclusive)
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-122Secondarysecure@microsoft.com
CWE ID: CWE-122
Type: Secondary
Source: secure@microsoft.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20868secure@microsoft.com
Vendor Advisory
https://www.vicarius.io/vsociety/posts/cve-2026-20868-detection-script-heap-based-buffer-overflow-vulnerability-affecting-windows-rrasaf854a3a-2127-422b-91ae-364da2661108
N/A
https://www.vicarius.io/vsociety/posts/cve-2026-20868-mitigation-script-heap-based-buffer-overflow-vulnerability-affecting-windows-rrasaf854a3a-2127-422b-91ae-364da2661108
N/A
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20868
Source: secure@microsoft.com
Resource:
Vendor Advisory
Hyperlink: https://www.vicarius.io/vsociety/posts/cve-2026-20868-detection-script-heap-based-buffer-overflow-vulnerability-affecting-windows-rras
Source: af854a3a-2127-422b-91ae-364da2661108
Resource: N/A
Hyperlink: https://www.vicarius.io/vsociety/posts/cve-2026-20868-mitigation-script-heap-based-buffer-overflow-vulnerability-affecting-windows-rras
Source: af854a3a-2127-422b-91ae-364da2661108
Resource: N/A
Change History
0Changes found
Details not found