Unquoted Windows search path vulnerability in Moxa Active OPC Server before 2.4.19 allows local users to gain privileges via a Trojan horse…

published 2016-09-24 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-6728

cvss: 8.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits: 0; none known

Unquoted Windows search path vulnerability in Moxa Active OPC Server before 2.4.19 allows local users to gain privileges via a Trojan horse executable file in the %SYSTEMDRIVE% directory.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-16-264-01 updated 2025-06-09 cvss 8.8

Moxa Active OPC Server Unquoted Service Path Escalation Vulnerability

Moxa Active OPC Server <2.4.19
affected: mitigation “For existing Active OPC installations, Moxa suggests upgrading to Active OPC Server Version 2.4.19.”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.8	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

CWE-428 Unquoted Search Path or Element

References

ics-cert.us-cert.gov /advisories/ICSA-16-264-01
third-party-advisory, us-government-resource
securityfocus.com /bid/93046
vdb-entry

Sources

CVE List CVE-2016-5793
NVD CVE-2016-5793

Fencer Vulns 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.

Summary