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CVE-2019-0959· NVD / CVE Program· CNA microsoft

Windows Common Log File System Driver Elevation of Privilege Vulnerability

An elevation of privilege vulnerability exists when the Windows Common Log File System (CLFS) driver improperly handles objects in memory. An attacker who successfully exploited this vulnerability could run processes in an elevated context. To exploit the vulnerability, an attacker would first have to log on to the system, and then run a specially crafted application to take control over the affected system. The security update addresses the vulnerability by correcting how CLFS handles objects in memory.

HighCVSS 7.0 · v3.1—Proof of concept No fix recorded
Published
Jun 12, 2019
Updated
Jun 16, 2026
EPSS
3.5% · 89th percentile
CWE
—
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Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.5%

CNA vs NVD score

NVD
—
CNA · microsoft
7.0
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
microsoftwindows 10
microsoftwindows server 2016
microsoftwindows server 2019

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 20161803
  • microsoft windows server 20161903
  • microsoft windows server 2019all versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Windows 10 Version 1803

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1809

    • 10.0.17763.0 and later · before publicationaffected
    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1903 for 32-bit Systems

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1903 for ARM64-based Systems

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1903 for x64-based Systems

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows Server 2019

    • 10.0.17763.0 and later · before publicationaffected

  • Microsoft Windows Server 2019 (Server Core installation)

    • 10.0.17763.0 and later · before publicationaffected

  • Microsoft Windows Server, version 1803 (Server Core Installation)

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows Server, version 1903 (Server Core installation)

    • 10.0.0 and later · before publicationaffected

Same product

microsoft: all records

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    62This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrydos2019-06-24

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+12 d
  3. TodaySep 30, 2026+2667 d
EPSS, last 120 days+1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records