CVE-2026-85809

Summary

The vulnerability is a heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) that allows remote attackers to execute arbitrary code with system-level privileges. This flaw is particularly dangerous because it can be exploited without authentication, giving attackers full control over affected systems.

Exploitability

Exploitation is relatively straightforward as it requires only network access to the RRAS service, with no authentication needed, though the target must have RRAS enabled and accessible over the network.

Blast radius

The impact could be severe across enterprise networks since RRAS is commonly used for remote access solutions, potentially allowing attackers to pivot through multiple systems and establish persistent access to critical infrastructure.

Detection

No reliable host or network indicator is derivable from the published description.

Prioritized remediation

Disable RRAS service on all affected Windows systems until a patch is available, or restrict network access to RRAS endpoints using firewall rules to limit exposure to trusted networks only.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.