{"status":"success","data":{"id":"CVE-2026-41709","slug":"cve-2026-41709-broadcom-vmware-esx-logging-bypass","title":"Broadcom VMware ESXi Insufficient Logging & Hypervisor Audit Bypass","summary":"Critical hypervisor evasion vulnerability in VMware ESXi allowing administrative actors to bypass forensic logging and manipulate virtual machines silently.","description":"Broadcom VMware ESXi contains an insufficient logging vulnerability that allows an authenticated administrative threat actor or compromised management API token to perform privileged hypervisor modifications, snapshot extraction, and disk manipulation without telemetry generation in host audit logs.","severity":"HIGH","cvss_score":8.4,"cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N","cvss_metrics":{"scope":"CHANGED","integrity":"HIGH","attackVector":"NETWORK","availability":"NONE","confidentiality":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","privilegesRequired":"HIGH"},"epss_score":0.887,"epss_percentile":0.978,"cisa_kev":true,"cisa_date_added":"2026-10-28T00:00:00.000Z","cisa_due_date":"2026-11-11T00:00:00.000Z","ransomware_campaign":null,"threat_actors":["UNC3886","Scattered Spider Affiliates"],"exploit_status":"active_wild","cwes":[{"id":"CWE-778","name":"Insufficient Logging"},{"id":"CWE-284","name":"Improper Access Control"}],"affected_vendors":["Broadcom","VMware"],"affected_products":[{"cpe":"cpe:2.3:o:broadcom:vmware_esxi:*:*:*:*:*:*:*:*","vendor":"Broadcom","product":"VMware ESXi","fixed_version":"ESXi 8.0 U3b / 7.0 U3s","affected_versions":"ESXi 7.0, 8.0 up to patch build 24391218"}],"ai_analysis":{"sigma_rule":"title: ESXi Unauthorized VIB Installation\nstatus: high\nlogsource:\n  product: esxi\ndetection:\n  selection:\n    message|contains: 'software vib install'\n  condition: selection","analyzed_at":"2026-10-28T12:00:00.000Z","model_provider":"Gemini 2.0 Flash Security Sentinel","executive_summary":"Actively exploited in the wild by sophisticated cyber espionage threat groups to maintain persistent stealth access across hypervisor infrastructure while completely evading SIEM monitoring.","detection_guidance":"Audit ESXi hosts for unauthorized VIB packages using `esxcli software vib list`. Compare package signatures against Broadcom official release digests.","mitigation_playbook":["Apply Broadcom Security Advisory VMSA-2026-0017 updates immediately.","Implement vSphere lockdown mode (Strict) to prevent direct management access to ESXi hosts.","Configure independent syslog forwarding over TLS with tamper-proof remote retention."],"technical_root_cause":"VMware ESXi's management daemon (`hostd`) fails to serialize log entries for specific low-level internal RPC operations invoked via direct socket communication, enabling an adversary with hypervisor root credentials to unhook security agents and clone VMDK storage arrays silently.","exploitation_mechanism":"Adversaries leverage stolen vCenter credentials to connect to ESXi hostd, issuing non-logged management calls to deploy backdoor VIBs (vSphere Installation Bundles) and establish persistent out-of-band reverse shells.","enterprise_blast_radius":"Total stealth control over virtualized tier-0 infrastructure (AD domain controllers, databases, secrets vaults), invisible to guest-OS endpoint detection (EDR) tools."},"references":[{"url":"https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/38017","type":"advisory","title":"Broadcom Security Advisory"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","type":"cisa","title":"CISA KEV Alert"}],"published_at":"2026-10-28T00:00:00.000Z","updated_at":"2026-10-29T10:00:00.000Z"}}