Security readout for executives and security teams
Plain-English summary
CVE-2019-0620 is a Hyper-V guest-to-host escape vulnerability. A trusted or compromised user inside a guest VM could run a crafted application and make the Windows Hyper-V host execute code. This matters because host compromise can affect many virtual machines and the virtualization boundary itself.
Executive priority
Treat as high priority for virtualization infrastructure, especially shared or semi-trusted environments. The business risk is host takeover from inside a VM, which can undermine workload isolation and affect multiple systems hosted on the same server.
Technical view
Windows Hyper-V failed to properly validate input from an authenticated guest operating system user. Successful exploitation could execute arbitrary code on the host OS. CVSS 3.1 is 7.6 with adjacent attack vector, high complexity, high privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to Microsoft Hyper-V hosts running the listed Windows 8.1, Windows 10, Windows Server 2012, 2012 R2, 2016, 2019, and Server Core versions. Risk is higher where guest administrators, tenants, or workloads are not fully trusted.
Exploitation context
The sources do not show CISA KEV listing or active exploitation. Exploitation requires an authenticated user on a guest OS and a specially crafted application. This is not described as unauthenticated internet remote exploitation, but successful exploitation crosses the guest-host boundary.
Researcher notes
Evidence supports a Hyper-V input validation flaw with guest-to-host code execution impact. The bundle does not provide exploit details, proof of exploitation, or specific KB identifiers. Avoid assuming internet reachability; focus analysis on guest trust boundaries, Hyper-V role presence, OS version, and update state.
Mitigation direction
- Apply the applicable Microsoft security update for CVE-2019-0620.
- Check MSRC guidance for affected OS-specific update details.
- Prioritize Hyper-V hosts running untrusted or multi-tenant guest workloads.
- Restrict guest OS administrative access to trusted users only.
- Retire or isolate unsupported affected Windows builds.
Validation and detection
- Inventory Hyper-V hosts and compare OS versions against affected products.
- Confirm the CVE-2019-0620 Microsoft security update is installed.
- Identify guests managed by third parties or less-trusted administrators.
- Review vulnerability scanner results for this CVE on Hyper-V hosts.
- Document exceptions where legacy hosts cannot be updated.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-0620 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C16Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.6HighVector: CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Windows Hyper-V Remote Code Execution VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0620CVE reference · x_refsource_MISC, x_transferred
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.