CVE-2025-30334 in OpenBSD
Summary
by MITRE • 03/20/2025
In OpenBSD 7.6 before errata 006 and OpenBSD 7.5 before errata 015, traffic sent over wg(4) could result in kernel crash.
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Analysis
by VulDB Data Team • 09/05/2025
The vulnerability identified as CVE-2025-30334 represents a critical kernel crash issue affecting OpenBSD systems running specific versions prior to their respective security errata releases. This flaw manifests within the wireguard implementation through the wg(4) network interface driver, which is responsible for handling wireguard protocol traffic. The vulnerability impacts both OpenBSD 7.6 before errata 006 and OpenBSD 7.5 before errata 015, indicating a widespread issue affecting multiple stable releases of the operating system.
The technical root cause of this vulnerability lies within the kernel's handling of network packets transmitted through the wireguard interface. When malicious or malformed traffic is processed by the wg(4) driver, it triggers a kernel panic condition that results in system crash and complete service disruption. This type of vulnerability falls under the CWE-122 category of "Heap-based Buffer Overflow" or more specifically relates to improper handling of network protocol data structures. The flaw demonstrates a classic case of insufficient input validation and memory management within kernel space network processing code.
The operational impact of this vulnerability is severe for any organization relying on OpenBSD systems with wireguard networking capabilities. A successful exploitation of this vulnerability can result in complete system downtime, requiring manual intervention for system recovery and potential data loss during the crash event. Network administrators managing wireguard tunnels or VPN services using affected OpenBSD versions face significant risk of service disruption, particularly in environments where high availability is critical. The vulnerability's nature means that any system processing wireguard traffic could be susceptible to denial of service attacks, making it particularly dangerous in production environments.
Mitigation strategies for CVE-2025-30334 require immediate implementation of the respective security errata releases from OpenBSD. System administrators should prioritize updating their OpenBSD installations to versions containing errata 006 for 7.6 and errata 015 for 7.5. Additionally, network monitoring should be enhanced to detect unusual traffic patterns that might indicate exploitation attempts. Organizations should consider implementing network segmentation to limit exposure and disable wireguard interfaces when not actively required. From an ATT&CK framework perspective, this vulnerability aligns with techniques involving privilege escalation and denial of service through kernel exploitation, making it a critical target for both defensive and offensive security operations. The vulnerability also highlights the importance of maintaining up-to-date security patches and proper network protocol implementation validation in kernel space code.