CVE-2026-21986

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{}

{"analysis": {"en": {"generated_at": "2026-04-18T04:21:05.484819+00:00", "value": {"mitigation_remediation": ["Upgrade Oracle VM VirtualBox to a version that includes the fix (newer than 7.2.4 or 7.1.14).", "Restrict local access to the host machine so that only trusted administrators can log on, thereby preventing unauthorized exploitation of the denial\u2011of\u2011service flaw.", "If an immediate upgrade is not possible, consider uninstalling or disabling VirtualBox on hosts that do not require it for operational purposes.", "Monitor the host system for abnormal VirtualBox crashes and apply updates promptly once available."], "summary": {"action": "Patch Immediately", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Oracle VM VirtualBox versions 7.1.14 and 7.2.4 are affected. These versions are released by Oracle Corporation for use on Windows hosts that run Windows virtual machines.", "description_and_impact": "A local attacker who can log on to the infrastructure hosting Oracle VM VirtualBox can trigger a crash of the VirtualBox process, causing the virtual machine to hang or repeatedly crash. The flaw does not disclose data or enable code execution, but it can bring the virtual machine to a complete denial of service. The vulnerability resides in the Core component of Oracle VM VirtualBox and has been demonstrated to impact Windows\u2011based virtual machines.", "risk_and_exploitability": "The vulnerability carries a CVSS v3.1 score of 7.1, indicating high severity. EPSS shows a very low exploitation probability (<1%). It is not listed in the CISA KEV catalog. Although the attack vector is local (logon to the infrastructure), an attacker with local access can easily trigger the failure, meaning that in environments where the VirtualBox host is accessible to untrusted users, the risk is significant. Because the impact is a denial of service, the effect is limited to availability rather than confidentiality or integrity."}}}}, "created": "2026-04-18T04:30:35.825378+00:00", "title": "Unauthenticated local denial of service in Oracle VM VirtualBox 7.x", "updated": "2026-04-18T04:30:35.825390+00:00", "vendors": [], "weaknesses": ["CWE-400"]}