How easily can this vulnerability be exploited in practice?

Exploitability depends on network exposure and the exact token format, but because the token generation was predictable and not cryptographically strong, a determined attacker with network access and automation could feasibly brute‑force valid tokens, especially if no strict rate limiting or monitoring was in place.

Does an attacker need an existing account or credentials to exploit this issue?

Not necessarily. If the NervesHub API is exposed over the network and accepts tokens as authentication, an attacker can attempt to guess tokens without having any prior account. However, knowledge of common user identifiers or deployment patterns could further reduce the search space and improve attack efficiency.

What is the safest general fix pattern for developers?

The safest pattern is to redesign token handling to: - Generate all tokens with a cryptographically secure random number generator, - Use high‑entropy, opaque token values, - Hash tokens before storing them, and - Separate token types (session vs. API) with explicit scopes and lifetimes. This pattern reduces the risk of both brute‑force attacks and damage from backend data leaks.

Severity:

CRITICAL RISK

(9.8)

Predictable API Token Generation (CWE-330) in NervesHub OTA Management Service

CVE-2025-64097

Published:

Jan 22, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Insufficient Randomness in Authentication Tokens

CWE:

CWE-330

Impact:

Account Takeover and Unauthorized API Access

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Insufficient Randomness in Authentication Tokens

CWE:

CWE-330

Impact:

Account Takeover and Unauthorized API Access

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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Predictable API Token Generation (CWE-330) in NervesHub OTA Management Service

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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