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CVE-2026-20868 is a heap-based buffer overflow vulnerability in Windows Routing and Remote Access Service (RRAS). The flaw can be triggered over the network and is described as allowing remote code execution by an unauthorized attacker. Available reporting further indicates exploitation is associated with RRAS administration tooling and can be triggered when a user is induced to connect to a malicious RRAS server, causing a heap overflow that results in code execution on the vulnerable system. The vulnerability is classified as CWE-122 and has been described with a CVSS v3.1 vector of AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
8 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.
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.