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Fencer Intel
high 7.8

CVE-2019-3999 json

Improper neutralization of special elements used in an OS command in Druva inSync Windows Client 6.5.0 allows a local, unauthenticated atta…

published 6y ago modified 4mo ago also EUVD-2019-13606

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.6%
EPSS 8.6% chance of exploitation in 30 days, percentile 95%
public exploits
2
Metasploit and Exploit-DB

Summary

Improper neutralization of special elements used in an OS command in Druva inSync Windows Client 6.5.0 allows a local, unauthenticated attacker to execute arbitrary operating system commands with SYSTEM privileges.

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Timeline

  1. First public exploit (Metasploit exploit/windows/local/druva_insync_insynccphwnet64_rcp_type_5_priv_esc)
  2. Published

Exploit prediction

8.57% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Metasploit exploit/windows/local/druva_insync_insynccphwnet64_rcp_type_5_priv_esc Druva inSync inSyncCPHwnet64.exe RPC Type 5 Privilege Escalation metasploit exploit, excellent rank, 2020-02-25
  • EDB-48400 Druva inSync Windows Client 6.5.2 - Local Privilege Escalation local, 2020-04-29
  • tenable.com https://www.tenable.com/security/research/tra-2020-12 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/157493/Druva-inSync-Windows-Client-6.5.2-Privilege-Escalation.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/157680/Druva-inSync-inSyncCPHwnet64.exe-RPC-Type-5-Privilege-Escalation.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • n/a Druva inSync Windows Client

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.