Elevation of Privilege in Windows Routing and Remote Access Service (RRAS)
CVE-2026-20843 is an elevation-of-privilege vulnerability in Windows Routing and Remote Access Service (RRAS). The issue is described as improper access control in RRAS that allows an authorized attacker to elevate privileges locally. Microsoft rated the issue 7.8 CVSS and identified it as one of the January 2026 Patch Tuesday vulnerabilities that were considered more likely to be exploited. Available reporting indicates the flaw affects local authorization and access-control enforcement within the RRAS component, but the specific vulnerable function or code path is not provided in the supplied content.
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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
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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
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Windows RRAS elevation of privilege vulnerability assessed as 'Exploitation More Likely' by Microsoft; no exploitation reported in the content.
An elevation-of-privilege vulnerability in Windows Routing and Remote Access Service (RRAS) that Microsoft assessed as more likely to be exploited.
A local elevation of privilege vulnerability in Windows RRAS due to improper access control, potentially enabling SYSTEM escalation.
A Windows Routing and Remote Access Service (RRAS) elevation-of-privilege (EoP) vulnerability that Microsoft rates as more likely to be exploited.
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.