CVE-2023-21886 in VM VirtualBox
Summary
by MITRE • 01/18/2023
Vulnerability in the Oracle VM VirtualBox product of Oracle Virtualization (component: Core). Supported versions that are affected are Prior to 6.1.42 and prior to 7.0.6. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle VM VirtualBox. Successful attacks of this vulnerability can result in takeover of Oracle VM VirtualBox. CVSS 3.1 Base Score 8.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 08/24/2025
The vulnerability identified as CVE-2023-21886 represents a critical security flaw within Oracle VM VirtualBox's core component that affects versions prior to 6.1.42 and 7.0.6. This vulnerability resides in Oracle's virtualization software platform that is widely deployed across enterprise environments for running virtual machines and managing virtualized infrastructure. The affected Oracle VM VirtualBox versions have been identified as particularly susceptible to exploitation due to insufficient input validation and inadequate access controls within the core virtualization engine. The vulnerability's classification as difficult to exploit indicates that while the attack surface is accessible, specific conditions and prerequisites must be met for successful compromise. Security researchers have determined that this flaw can be leveraged by unauthenticated attackers who possess network access to the vulnerable system, making it particularly concerning given the prevalence of network-based attacks in modern threat landscapes.
The technical nature of this vulnerability stems from inadequate validation of input parameters within the VirtualBox core components, which allows malicious actors to manipulate the virtualization environment through multiple network protocols. This flaw specifically impacts the system's ability to properly authenticate and authorize network requests, creating opportunities for unauthorized access and control over the virtualization platform. The vulnerability's CVSS score of 8.1 indicates high severity across all impact vectors including confidentiality, integrity, and availability, suggesting that successful exploitation could result in complete system compromise. The attack vector analysis reveals that the vulnerability is accessible via network protocols, requiring minimal privileges from attackers who are not authenticated to the system. This characteristic places the vulnerability in the ATT&CK framework under the 'Initial Access' and 'Persistence' phases, where attackers can establish footholds within virtualized environments and potentially maintain long-term access to compromised systems.
The operational impact of CVE-2023-21886 extends beyond simple system compromise to encompass complete takeover of Oracle VM VirtualBox environments, which can have cascading effects throughout enterprise infrastructure. Organizations utilizing vulnerable versions of VirtualBox may experience unauthorized access to virtual machines, potential data breaches, and complete loss of control over their virtualized computing resources. The vulnerability's ability to affect both confidentiality and integrity simultaneously means that attackers could not only access sensitive virtual machine data but also modify critical system configurations and virtual machine states. The availability impact suggests that attackers could potentially disrupt services by causing virtual machines to crash or become inaccessible, leading to business continuity issues. Organizations running affected versions must consider the implications for their entire virtualization infrastructure, as compromise of a single VirtualBox instance could potentially provide attackers with access to multiple virtual machines and underlying host resources.
Mitigation strategies for CVE-2023-21886 should prioritize immediate patching of affected Oracle VM VirtualBox installations to versions 6.1.42 or 7.0.6, which contain the necessary security fixes. Organizations should implement network segmentation and access controls to limit exposure of VirtualBox instances to untrusted networks, while also monitoring network traffic for signs of exploitation attempts. Security teams should conduct comprehensive vulnerability assessments of their virtualization environments to identify all instances running vulnerable versions, and implement network-based intrusion detection systems to monitor for exploitation attempts. The remediation process should include verification that all virtualization components have been properly updated and that no legacy versions remain accessible. Organizations should also consider implementing additional security controls such as network access control lists, firewall rules, and virtual machine isolation measures to reduce the potential impact of exploitation. Given the vulnerability's classification and potential for significant damage, security teams should also prepare incident response procedures that specifically address virtualization platform compromises, ensuring rapid detection and response to any exploitation attempts. The vulnerability's alignment with CWE categories related to input validation and access control underscores the importance of maintaining robust security practices throughout the virtualization stack.