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Weakness (CWE)

CWE-341: Predictable from Observable State

Base Draft

A number or object is predictable based on observations that the attacker can make about the state of the system or network, such as time, process ID, etc.

How to prevent it (3 mitigations)

  1. Implementation

    Increase the entropy used to seed a PRNG.

  2. Architecture and Design, Requirements

    Use products or modules that conform to FIPS 140-2 [REF-267] to avoid obvious entropy problems. Consult FIPS 140-2 Annex C ("Approved Random Number Generators").

  3. Implementation

    Use a PRNG that periodically re-seeds itself using input from high-quality sources, such as hardware devices with high entropy. However, do not re-seed too frequently, or else the entropy source might block.

Source: MITRE CWE-341

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  • Medium 5.0
    CVE-2025-48461 Public exploit

    Weak Session Cookie Entropy

    Successful exploitation of the vulnerability could allow an unauthenticated attacker to conduct brute force guessing and account takeover as the session cookies are predictable, potentially allowing the attackers to gain root, admin or user access and reset p…

    Advantech Advantech Wireless Sensing and Equipment (WISE)