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CVE-2026-66372— Predictable Seed in Pseudo-Random Number Generator (PRNG) in Digital Watchdog VMAX DVR and NVR Product Lineups

Quick assessment

Affected
Digital Watchdog VMAX A1 G4 DVR
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Digital Watchdog VMAX A1 G4 DVR是Digital Watchdog公司的一款安防监控产品。 Digital Watchdog VMAX A1 G4 DVR、VMAX IP G4 NVR、VMAX A1 PLUS、VA1G4 Recorder和VG4 Recorder 所有版本存在加密问题漏洞，该漏洞源于使用随机值不足，导致Web会话令牌可预测，令牌熵受限于种子空间。

CVSS 6.8 · Medium EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
Digital Watchdog VA1G4 Recorder All affected
Digital Watchdog VG4 Recorder All affected
Digital Watchdog VMAX A1 G4 DVR All affected
Digital Watchdog VMAX A1 PLUS All affected
Digital Watchdog VMAX IP G4 NVR All affected
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I. Basic Information for CVE-2026-66372

Vulnerability Information
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Vulnerability Title
Predictable Seed in Pseudo-Random Number Generator (PRNG) in Digital Watchdog VMAX DVR and NVR Product Lineups
Source: CVE Program / CVE List V5
Vulnerability Description
The affected products use insufficiently random values, which allows web session tokens to be predictable, bounding token entropy to the seed space.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
PRNG中使用可预测种子
Source: CVE Program / CVE List V5
Vulnerability Title
Digital Watchdog VMAX A1 G4 DVR 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Digital Watchdog VMAX A1 G4 DVR是Digital Watchdog公司的一款安防监控产品。 Digital Watchdog VMAX A1 G4 DVR、VMAX IP G4 NVR、VMAX A1 PLUS、VA1G4 Recorder和VG4 Recorder 所有版本存在加密问题漏洞，该漏洞源于使用随机值不足，导致Web会话令牌可预测，令牌熵受限于种子空间。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Digital Watchdog VMAX A1 G4 DVR All -
Digital Watchdog VMAX IP G4 NVR All -
Digital Watchdog VMAX A1 PLUS All -
Digital Watchdog VA1G4 Recorder All -
Digital Watchdog VG4 Recorder All -

II. Public POCs for CVE-2026-66372

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III. Intelligence Information for CVE-2026-66372

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Vendor Advisories for CVE-2026-66372 (2)

Other References for CVE-2026-66372 (1)

Same Patch Batch · Digital Watchdog · 2026-09-15 · 6 CVEs total

CVE-2026-66890 9.6 CRITICAL Use of Hard-coded Credentials in Digital Watchdog VMAX DVR and NVR Product Lineups
CVE-2026-66887 9.6 CRITICAL Missing Authorization in Digital Watchdog VMAX DVR and NVR Product Lineups
CVE-2026-68070 8.8 HIGH Missing Authentication for Critical Function in Digital Watchdog VMAX DVR and NVR Product
CVE-2026-68950 8.8 HIGH Use of Hard-coded Credentials in Digital Watchdog VMAX DVR and NVR Product Lineups
CVE-2026-68953 6.5 MEDIUM Missing Authentication for Critical Function in Digital Watchdog VMAX DVR and NVR Product

IV. Related Vulnerabilities

Same product: VMAX A1 G4 DVR
Same vendor: Digital Watchdog
Same weakness: CWE-337