Lessons from Qilin: What the Industry’s Most Efficient Ransomware Teaches Us

Qilin has quietly become one of the most active and impactful ransomware operations in the world today. If it’s not already on your threat radar, now is the time to take notice. This blog unpacks how Qilin operates, why it’s gaining traction across cybercriminal networks, and what steps security...

VMware ESXi 7.0 / 8.0 Multiple Vulnerabilities (VMSA-2025-0004)

The version of VMware ESXi installed on the remote host is 7.0 prior to 7.0 Update 3s, 8.0 Update 2 prior to 8.0 Update 2d, or 8.0 Update 3 prior to 8.0 Update 3d. It is, therefore, affected by multiple vulnerabilities as referenced in the VMSA-2025-0004 advisory: - VMware ESXi, and Workstation...

VMware ESXi 7.0 / 8.0 Multiple Vulenerabilities (VMSA-2025-0010)

The version of VMware ESXi installed on the remote host is 7.0.x prior to 7.0 Update 3v or 8.0.x prior to 8.0 Update 3e. It is, therefore, affected by multiple vulnerabilities as referenced in the VMSA-2025-0010 advisory. - ESXi contains a denial-of-service vulnerability that occurs when performi...

CVE-2023-36628

A flaw exists in VASA which allows users with access to a vSphere/ESXi VMware admin on a FlashArray to gain root access through privilege escalation...

CVE-2022-31696

VMware ESXi contains a memory corruption vulnerability that exists in the way it handles a network socket. A malicious actor with local access to ESXi may exploit this issue to corrupt memory leading to an escape of the ESXi sandbox...

CVE-2021-22043

VMware ESXi contains a TOCTOU Time-of-check Time-of-use vulnerability that exists in the way temporary files are handled. A malicious actor with access to settingsd, may exploit this issue to escalate their privileges by writing arbitrary files...

CVE-2021-21994

SFCB Small Footprint CIM Broker as used in ESXi has an authentication bypass vulnerability. A malicious actor with network access to port 5989 on ESXi may exploit this issue to bypass SFCB authentication by sending a specially crafted request...

CVE-2021-21995

OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in a denial-of-service condition...

CVE-2021-22042

VMware ESXi contains an unauthorized access vulnerability due to VMX having access to settingsd authorization tickets. A malicious actor with privileges within the VMX process only, may be able to access settingsd service running as a high privileged user...

CVE-2020-3970

VMware ESXi 7.0 before ESXi7.0.0-1.20.16321839, 6.7 before ESXi670-202004101-SG and 6.5 before ESXi650-202005401-SG, Workstation 15.x before 15.5.5, and Fusion 11.x before 11.5.5 contain an out-of-bounds read vulnerability in the Shader functionality. A malicious actor with non-administrative loc...

CVE-2020-3992

OpenSLP as used in VMware ESXi 7.0 before ESXi7.0.1-0.0.16850804, 6.7 before ESXi670-202010401-SG, 6.5 before ESXi650-202010401-SG has a use-after-free issue. A malicious actor residing in the management network who has access to port 427 on an ESXi machine may be able to trigger a use-after-free...

CVE-2020-3981

VMware ESXi 7.0 before ESXi7.0.1-0.0.16850804, 6.7 before ESXi670-202008101-SG, 6.5 before ESXi650-202007101-SG, Workstation 15.x, Fusion 11.x before 11.5.6 contain an out-of-bounds read vulnerability due to a time-of-check time-of-use issue in ACPI device. A malicious actor with administrative...

CVE-2020-3968

VMware ESXi 7.0 before ESXi7.0.0-1.20.16321839, 6.7 before ESXi670-202004101-SG and 6.5 before ESXi650-202005401-SG, Workstation 15.x before 15.5.5, and Fusion 11.x before 11.5.5 contain an out-of-bounds write vulnerability in the USB 3.0 controller xHCI. A malicious actor with local administrati...

CVE-2020-3964

VMware ESXi 7.0 before ESXi7.0.0-1.20.16321839, 6.7 before ESXi670-202006401-SG and 6.5 before ESXi650-202005401-SG, Workstation 15.x before 15.5.2, and Fusion 11.x before 11.5.2 contain an information leak in the EHCI USB controller. A malicious actor with local access to a virtual machine may b...

CVE-2020-3971

VMware ESXi 6.7 before ESXi670-201904101-SG and 6.5 before ESXi650-201907101-SG, Workstation 15.x before 15.0.2, and Fusion 11.x before 11.0.2 contain a heap overflow vulnerability in the vmxnet3 virtual network adapter. A malicious actor with local access to a virtual machine with a vmxnet3...

CVE-2020-3999

VMware ESXi 7.0 prior to ESXi70U1c-17325551, VMware Workstation 16.x prior to 16.0 and 15.x prior to 15.5.7, VMware Fusion 12.x prior to 12.0 and 11.x prior to 11.5.7 and VMware Cloud Foundation contain a denial of service vulnerability due to improper input validation in GuestInfo. A malicious...

CVE-2020-3963

VMware ESXi 7.0 before ESXi7.0.0-1.20.16321839, 6.7 before ESXi670-202006401-SG and 6.5 before ESXi650-202005401-SG, Workstation 15.x before 15.5.2, and Fusion 11.x before 11.5.2 contain a use-after-free vulnerability in PVNVRAM. A malicious actor with local access to a virtual machine may be abl...

CVE-2020-3959

VMware ESXi 6.7 before ESXi670-202004101-SG and 6.5 before ESXi650-202005401-SG, VMware Workstation 15.x before 15.1.0 and VMware Fusion 11.x before 11.1.0 contain a memory leak vulnerability in the VMCI module. A malicious actor with local non-administrative access to a virtual machine may be ab...

CVE-2020-3958

VMware ESXi 6.7 before ESXi670-202004101-SG and 6.5 before ESXi650-202005401-SG, VMware Workstation 15.x before 15.5.2 and VMware Fusion 11.x before 11.5.2 contain a denial-of-service vulnerability in the shader functionality. Successful exploitation of this issue may allow attackers with...

CVE-2020-3955

ESXi 6.5 without patch ESXi650-201912104-SG and ESXi 6.7 without patch ESXi670-202004103-SG do not properly neutralize script-related HTML when viewing virtual machines attributes. VMware has evaluated the severity of this issue to be in the Important severity range with a maximum CVSSv3 base sco...