CVE-2016-4523

Exp

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.

Published: 2016-06-09 Last update: 2026-04-22 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-4523 is rated Critical Active Threat (88/100): CVSS High severity, with high exploitation likelihood (EPSS 65.43%, 98th percentile). CISA KEV confirms active exploitation (added 2022-04-15) affecting Trihedral / VTScada (formerly VTS). a weakness (CWE-125) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2016-4523

Name: Trihedral VTScada (formerly VTS) Denial-of-Service Vulnerability · CISA KEV detail

Exploit added: 2022-04-15

Action due: 2022-05-06

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2016-4523

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-23 66.95% 65.43% -1.53%
2 2025-12-24 60.38% 66.95% +6.58%
3 2025-12-22 — 60.38% —

Full EPSS history (27 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-4523

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2016-4523

Affected software / configurations for CVE-2016-4523

Vendor Product Version Raw CPE
trihedral vtscada >= 8.0.05, < 11.2.02 cpe:2.3:a:trihedral:vtscada:*:*:*:*:*:*:*:*

References for CVE-2016-4523

URL Tags
http://www.securityfocus.com/bid/91077 Broken Link Third Party Advisory VDB Entry
http://www.zerodayinitiative.com/advisories/ZDI-16-405 Third Party Advisory VDB Entry
https://ics-cert.us-cert.gov/advisories/ICSA-16-159-01 Third Party Advisory US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4523 US Government Resource
cvelogic Threat Intelligence