RCE in Windows Routing and Remote Access Service (RRAS) via heap-based buffer overflow
CVE-2026-20868 is a heap-based buffer overflow vulnerability in Microsoft Windows Routing and Remote Access Service (RRAS). The issue is remotely reachable (AV:N) and, per the provided reporting, can be triggered when a user is tricked into connecting to a malicious RRAS server, resulting in a heap overflow condition and enabling arbitrary code execution on the vulnerable RRAS system. The associated CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, and the weakness class is CWE-122.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A severe vulnerability impacting Windows Routing and Remote Access Service (RRAS) (details not provided in the content).
A heap overflow remote code execution vulnerability in Windows RRAS administration tooling/server interaction, requiring domain authentication and user interaction to connect to a malicious RRAS server.
A severe vulnerability affecting Windows Routing and Remote Access Service (RRAS) addressed in Microsoft’s January 2026 Patch Tuesday release.
A Windows RRAS vulnerability described as enabling remote code execution due to a heap-based buffer overflow.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.