Unauthenticated Network Attacker Can Leverage Windows Routing and Remote Access Service (RRAS) Heap Buffer Overflow for Remote Code Execution (CVSS 9.8)
Last refreshed2026-10-15
Status: UPDATED
| Advisory ID: CVE-2026-85809
Key Details
CVE
CVE-2026-85809
CVSS Score / Version
9.8 (Critical) / CVSS v3.1
Updated
2026-10-14
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Prose
attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products
see table below
Classified as
CWE-122 (Heap-based Buffer Overflow)
Exploitation prediction (EPSS)
0.93% probability of exploitation in the next 30 days (60% percentile) -- FIRST.org's EPSS model.
Affected Products, Subsystems & Sectors
Vendor
Product
Affected Versions
Patch Status
Microsoft
Windows 11 (version 23H2)
Microsoft
Windows 11 (version 24H2)
Microsoft
Windows 11 (version 25H2)
Microsoft
Windows 11 (version 26H1)
Microsoft
Windows Server 2025
Microsoft
Windows 10 (version 1607)
Microsoft
Windows 10 (version 1809)
Microsoft
Windows 10 (version 21H2)
Microsoft
Windows 10 (version 22H2)
Microsoft
Windows Server 2012
Microsoft
Windows Server 2016
Microsoft
Windows Server 2019
Microsoft
Windows Server 2022
Microsoft
Windows Server 2012 R2
Microsoft
Windows 11 Version 26H2
Subsystems
OT Supporting Infrastructure
Sectors
All Sectors
What to Know
Remote Code Execution in Windows Routing and Remote Access Service (RRAS) allows attacker to gain an unauthorized access to victim's machine
What to Do
Monitor Microsoft's web page for any future patch releases.