CVE-2026-71113 Overview
CVE-2026-71113 is a denial of service vulnerability in the Core component of Oracle VM VirtualBox. The flaw affects Oracle VM VirtualBox version 7.2.14 and is exploitable by an unauthenticated attacker with network access via the Remote Desktop Protocol (RDP). Successful exploitation causes a hang or a frequently repeatable crash, resulting in a complete denial of service of the Oracle VM VirtualBox instance. The weakness is categorized under [CWE-284: Improper Access Control].
Critical Impact
An unauthenticated remote attacker can trigger a full denial of service of Oracle VM VirtualBox over RDP without user interaction, halting hosted virtual machines.
Affected Products
- Oracle VM VirtualBox 7.2.14
- Oracle Virtualization (Core component)
- Deployments exposing the VirtualBox Remote Display Extension (VRDE) / RDP interface
Discovery Timeline
- 2026-08-18 - CVE-2026-71113 published to the National Vulnerability Database
- 2026-08-20 - Last updated in NVD database
Technical Details for CVE-2026-71113
Vulnerability Analysis
The vulnerability resides in the Core component of Oracle VM VirtualBox and is reachable through the product's RDP interface. An attacker with network access to the VirtualBox RDP listener can send crafted traffic that induces a hang or a repeatable crash of the hypervisor process. The flaw affects only availability. Confidentiality and integrity of the host and guest virtual machines are not directly impacted according to the vendor scoring.
Exploitation does not require authentication, privileges, or user interaction. This lowers the barrier for opportunistic attacks against VirtualBox hosts that expose RDP for remote console access. The Exploit Prediction Scoring System (EPSS) currently rates the probability of exploitation at 0.407% (34.16 percentile), and no public proof-of-concept has been observed.
Root Cause
Oracle categorizes the underlying weakness as improper access control ([CWE-284]) within the Core component. The RDP handling path fails to properly constrain untrusted network input, allowing an attacker to reach code that terminates or deadlocks the VirtualBox process. Oracle has not released a public technical breakdown of the internal function or protocol state responsible for the crash.
Attack Vector
The attack vector is network-based and targets the VirtualBox Remote Display Extension (VRDE) listener that provides RDP access to guest virtual machines. An attacker sends malicious RDP traffic to the exposed port. No credentials or prior access are required. Successful attacks produce a hang or repeatable crash of the VirtualBox process, terminating all guests running on the affected host.
See the Oracle Security Alert for vendor-specific technical guidance.
Detection Methods for CVE-2026-71113
Indicators of Compromise
- Unexpected termination or hang of VBoxHeadless, VirtualBoxVM, or VBoxSVC processes on hosts running VirtualBox 7.2.14.
- Repeated inbound connections to the VirtualBox VRDE/RDP port (default TCP 3389 or configured alternate) from untrusted sources immediately preceding a crash.
- Guest VM downtime events correlated with RDP session activity in host logs.
Detection Strategies
- Monitor host process telemetry for crashes or restarts of VirtualBox binaries, correlating with network flows to the VRDE listener.
- Deploy network detections that identify anomalous or malformed RDP handshakes targeting VirtualBox hosts.
- Review VirtualBox log files under the machine Logs/ directory for abnormal disconnects or assertion failures tied to the RDP subsystem.
Monitoring Recommendations
- Alert on repeated inbound RDP connections to hypervisor hosts, especially from external networks.
- Track VM availability metrics and hypervisor process uptime as leading indicators of exploitation attempts.
- Enrich firewall and IDS logs with hypervisor host identity to expedite triage of RDP-borne denial of service activity.
How to Mitigate CVE-2026-71113
Immediate Actions Required
- Apply the Oracle Critical Patch Update referenced in the Oracle Security Alert to all Oracle VM VirtualBox 7.2.14 installations.
- Restrict network access to the VirtualBox VRDE/RDP listener using host and network firewalls until patches are deployed.
- Inventory all VirtualBox 7.2.14 hosts across development, test, and production environments and prioritize internet-exposed systems.
Patch Information
Oracle addressed CVE-2026-71113 in its August 2026 Critical Patch Update. Administrators should upgrade Oracle VM VirtualBox to the fixed release documented in the Oracle Security Alert. No official workaround replaces the patch.
Workarounds
- Disable the VRDE/RDP server on VirtualBox VMs that do not require remote console access using VBoxManage modifyvm <vm> --vrde off.
- Bind the VRDE listener to 127.0.0.1 or a trusted management interface to prevent exposure to untrusted networks.
- Enforce network segmentation so only administrative hosts can reach the VirtualBox RDP port.
# Configuration example: disable VRDE and restrict listener address
VBoxManage modifyvm "<vm-name>" --vrde off
VBoxManage modifyvm "<vm-name>" --vrdeaddress 127.0.0.1
VBoxManage modifyvm "<vm-name>" --vrdeauthtype external
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
