EUVD-2026-79953

| CVE-2026-66372 HIGH

Predictable Seed in Pseudo-Random Number Generator (PRNG) (CWE-337)

2026-09-15 ics-cert@hq.dhs.gov

GHSA-gq5q-45hh-68cr

Information Disclosure

7.6

CVSS 4.0 · Vendor: hq

View

Vulnerability Assessment

Weakness

CWE

CWE-337

OWASP Top 10:2025

A04:2025 - Cryptographic Failures

ASVS 5.0

V11 - Cryptography Unpredictable PRNG seeds

Act Now Prioritize within 24-48h. Why: Active threat signals + CRITICAL/HIGH severity.

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

Predictable web session tokens in Digital Watchdog VMAX A1 G4 DVR, VMAX A1 PLUS, VA1G4/VG4 Recorders and VMAX IP G4 NVR devices allow an attacker positioned on the same network segment to derive valid session identifiers and impersonate authenticated users of the device web interface. The underlying weakness (CWE-337) is a PRNG seeded with insufficient entropy, which bounds the token space to the seed space rather than to a cryptographically large keyspace. CISA's ICS-CERT published the finding as ICSA-26-258-01; no public exploit code and no confirmed active exploitation were identified at time of analysis, and no fixed firmware version is named in the available advisory data.

Affected VersionsENISA

VMAX A1 G4 DVR All

VMAX A1 PLUS All

VA1G4 Recorder All

VG4 Recorder All

VMAX IP G4 NVR All

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (hq) PRIMARY 7.6 HIGH

CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (hq) · only source for this CVE.

CVSS VectorVendor: hq

Attack Vector

Adjacent

Attack Complexity

High

Attack Requirements

None

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

None

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

The affected products use insufficiently random values, which allows web session tokens to be predictable, bounding token entropy to the seed space.

Threat Intelligence Overview

EPSS Score

0.2%

Top 90% exploitable

Threat Intel

1 source

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS CISA

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat Yes

Deciding rule

Active threat signals + CRITICAL/HIGH severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Controlled

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: +10

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.