CVE-2016-4523: Trihedral VTScada (formerly VTS) Denial-of-Service Vulnerability

Patch now

HIGH 7.5EXPLOITEDREMOTEUPGRADE

CVE-2016-4523 is a high-severity flaw (CVSS 7.5) affecting vtscada, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The WAP interface in Trihedral VTScada (formerly VTS) 8.x through 11.x before 11.2.02 allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via unspecified vectors.

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Exploited in the wild (CISA KEV)
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	31.2% (top 2%)
CISA exploited list	Yes, fix due 2022-05-06
Weakness	CWE-125
Published	2016-06-09
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: trihedral

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-06-09 10:59 UTCPublished CVE record published
2022-04-15Exploited Added to the CISA Known Exploited Vulnerabilities list
2022-05-06Deadline CISA due date for US federal agencies to patch
2026-06-17 00:47 UTCUpdated Record last modified

trihedral vtscada UPGRADE

Affected: >= 8.0.05 and < 11.2.02

Fixed in: 11.2.02

Safe to downgrade to: a release before 8.0.05

1. Check installed version

apt-cache policy vtscada || rpm -q vtscada || vtscada --version

2. UPGRADE to 11.2.02 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vtscada

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vtscada

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.05 (Debian / Ubuntu)

apt-cache madison vtscada sudo apt install vtscada=<VERSION_BEFORE_8.0.05> sudo apt-mark hold vtscada

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list vtscada sudo dnf downgrade vtscada-<VERSION_BEFORE_8.0.05> sudo dnf versionlock add vtscada

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora ELN · makedumpfile · FIXED · 1.8.0-1.eln159 · FEDORA-2026-3bf4582b1f · source

sudo dnf upgrade --advisory=FEDORA-2026-3bf4582b1f

Fedora 46 · python-resend · FIXED · 2.50.1-1.fc46 · FEDORA-2026-8c29ba68cc · source

sudo dnf upgrade --advisory=FEDORA-2026-8c29ba68cc

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-4523?

vtscada: upgrade to 11.2.02. Exact commands for each OS are on this page.

Is CVE-2016-4523 being exploited?

Yes. CVE-2016-4523 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2016-4523 affect?

CVE-2016-4523 affects vtscada. Severity is high (CVSS 7.5). The WAP interface in Trihedral VTScada (formerly VTS) 8.x through 11.x before 11.2.02 allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via unspecified vectors.

How urgent is CVE-2016-4523?

Priority 81/100. High severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-6053 MEDIUM 6.1 UPGRADE A Cross-Site Scripting issue was discovered in Trihedral VTScada Versions prior to 11.2.26
CVE-2017-6045 HIGH 7.5 UPGRADE An Information Exposure issue was discovered in Trihedral VTScada Versions prior to 11.2.26
CVE-2017-6043 HIGH 7.5 UPGRADE A Resource Consumption issue was discovered in Trihedral VTScada Versions prior to 11.2.26
CVE-2017-14031 HIGH 7.8 UPGRADE An Improper Access Control issue was discovered in Trihedral VTScada 11.3.03 and prior
CVE-2017-14029 HIGH 7.8 UPGRADE An Uncontrolled Search Path Element issue was discovered in Trihedral VTScada 11.3.03 and prior

References

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