Chained for attack: OpenVPN vulnerabilities discovered leading to RCE and LPE

Microsoft researchers disclosed multiple OpenVPN vulnerabilities affecting millions of endpoints that, when chained, can allow authenticated attackers to achieve remote code execution and local privilege escalation; the report includes technical analysis of the bugs (including a TAP driver integer overflow and named-pipe stack overflow), exploitation scenarios requiring stolen or compromised user credentials, mitigation steps, Microsoft Defender detections, and hunting queries. OpenVPN patched the issues in versions 2.6.10 and 2.5.10 and users are strongly urged to apply updates and apply network segmentation and credential hygiene.