CVE-2019-3999Public exploit

SYSTEM command execution via unvalidated RPC request

Published Feb 25, 2020 · Updated Aug 4, 2024

OS command injection in Druva inSync Windows Client 6.5.0 allows local users to execute arbitrary commands with SYSTEM privileges. When handling RPC type 5 on TCP port 6064, inSyncCPHwnet64.exe passes unvalidated request data to CreateProcessW. Any local user able to send the crafted RPC request can gain complete SYSTEM-level control of the Windows endpoint.

CVSS severity7.8
High
EPSS probability8.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

OS command injection in Druva inSync Windows Client 6.5.0 allows local users to execute arbitrary commands with SYSTEM privileges. When handling RPC type 5 on TCP port 6064, inSyncCPHwnet64.exe passes unvalidated request data to CreateProcessW. Any local user able to send the crafted RPC request can gain complete SYSTEM-level control of the Windows endpoint.

The record

CVE
CVE-2019-3999
Published
Feb 25, 2020
Updated
Aug 4, 2024
Vendor
Druva
Product
Druva inSync Client
Classifications
CWE-78, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Druva · Druva inSync Clientversion=6.5.0

Published CVSS scores

7.2TenableAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8INCIBE-CERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo