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CVE-2026-26111 is a critical vulnerability in the Windows Routing and Remote Access Service (RRAS), which is a core component enabling VPNs and software-based routing in enterprise environments . The flaw is specifically an integer overflow or wraparound condition . When RRAS processes specially crafted network packets, the integer overflow occurs, corrupting memory in a way that an authorized attacker can leverage for remote code execution (RCE). This allows the attacker to run arbitrary code on the target machine without user interaction beyond being on the network. The vulnerability exists because the service fails to properly validate input sizes, leading to a miscalculation in memory allocation. An attacker on the same network could send a malicious request to a server running RRAS, triggering the overflow and taking control of the system. Given RRAS’s role in managing network traffic and remote access, a successful exploit could allow an attacker to pivot deeper into internal networks, intercept data, or disrupt connectivity . Microsoft confirmed this is an RCE flaw affecting the RRAS management tool and released emergency out-of-band updates (KB5084597) to address it alongside other related CVEs .
dailycve form:
Platform: Windows RRAS
Version: Multiple versions
Vulnerability :Integer overflow RCE
Severity: HIGH
date: 03/10/2026
Prediction: Patch already released (KB5084597)
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The vulnerability is triggered when a malicious remote server interacts with the RRAS component, specifically during integer handling operations that lead to a wraparound . This is a memory corruption issue in a core networking service.
Bash/Terminal Commands & Codes
Check if the RRAS service (RemoteAccess) is running:
`Get-Service RemoteAccess`
Verify installation of the security update (KB5084597) on Windows:
`Get-HotFix -Id KB5084597`
For Linux-based vulnerability scanners checking SMB/RPC services:
`nmap -p 445 –script smb-vuln- `
How Exploit
An authorized attacker on the same network could send a maliciously crafted packet to the RRAS service . The integer overflow during processing corrupts memory, allowing the attacker to execute arbitrary code with elevated privileges, potentially taking full control of the server .
Protection from this CVE
Apply the emergency out-of-band update KB5084597 immediately . Ensure the update is installed automatically on hotpatch-enabled devices. As a workaround, restrict network access to RRAS servers and monitor for unusual network traffic to port 445 and other RPC-related ports.
Impact
Successful exploitation allows an attacker to execute code remotely, leading to full system compromise. This could allow an attacker to disrupt the RRAS tool, intercept network traffic, or use the compromised server as a foothold to move laterally within the enterprise network .
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Sources:
Reported By: nvd.nist.gov
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