Security readout for executives and security teams
Plain-English summary
CVE-2019-0959 is a Windows local privilege escalation flaw in CLFS. A logged-in attacker could run a malicious app and gain elevated control. It is serious for workstations, servers, and shared systems still running affected Windows versions without the Microsoft update.
Executive priority
Treat as a high-priority patching issue for affected legacy Windows assets. It is not described as remotely exploitable or actively exploited in the provided sources, but it can turn a local foothold into elevated control.
Technical view
Microsoft describes improper object handling in memory by the Windows Common Log File System driver. Exploitation requires local logon and execution of a specially crafted application. Successful exploitation can run processes in an elevated context. The CVSS 3.1 score is 7.0, with low privileges required and high impact.
Likely exposure
Exposure is limited to the listed Microsoft Windows 10 and Windows Server 2019/Server Core versions from 1803, 1809, and 1903. Internet-facing reachability is not the main factor; local user access, shared servers, VDI, and unmanaged endpoints matter more.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The CVSS vector records proof-of-concept exploit maturity, but exploitation is local, high complexity, and requires a logged-in attacker to run a crafted application.
Researcher notes
Focus validation on local privilege escalation exposure rather than perimeter scanning. The affected component is the Windows CLFS driver, and the fix corrects memory object handling. The provided data does not include CWE mapping, exploit details, or KB-level patch identifiers.
Mitigation direction
- Apply the Microsoft security update for affected Windows versions.
- Confirm update applicability and supersedence in the MSRC guidance.
- Prioritize shared servers, VDI, and high-value administrator workstations.
- Limit local logon and untrusted application execution until patched.
Validation and detection
- Inventory Windows 10 1803, 1809, 1903, and Server 2019 assets.
- Check patch status against the MSRC CVE-2019-0959 advisory.
- Verify CLFS-related alerts with endpoint telemetry where available.
- Review systems allowing broad interactive logon or user-installed applications.
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.
Privilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-0959 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/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:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Windows Common Log File System Driver Elevation of Privilege VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0959CVE 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.