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Home/CWEs/CWE-331
Common Weakness Enumeration

CWE-331: Insufficient Entropy

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The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.

Abstraction
Base
Related CVEs
0

▪References & documentation

https://cwe.mitre.org/data/definitions/331.htmlNVD CWE listing

▪ How attackers exploit CWE-331

MITRE ATT&CK techniques associated with this weakness class (mapped via MITRE CAPEC). A vulnerability of this type could let an adversary carry out:

T1134Access Token Manipulationstealth · privilege-escalationT1606Forge Web Credentialscredential-access

Step-by-step: how CWE-331 gets exploited

A stage-by-stage walkthrough of the attack, mapped to the real MITRE ATT&CK tactics for this weakness — what the attacker is trying to do, what's at risk (what can be stolen or damaged), and how you defend. Understanding the playbook is how you shut it down.

  1. 1
    Privilege escalationprivilege-escalation

    Gain higher privileges — from a limited account to admin/root.

    At risk / what's stolen

    Over-permissioned services, weak file/permission boundaries, and setuid paths.

    How you defend

    Drop privileges, enforce least privilege, and lock down file permissions.

  2. 2
    Credential accesscredential-access

    Steal passwords, tokens, keys, and session material.

    At risk / what's stolen

    Passwords, API keys, session tokens, SSH/TLS keys, and secrets in memory, env, or config.

    How you defend

    Secret managers, short-lived tokens, and no secrets in code/env/logs.

This is a defensive, conceptual walkthrough for education — stages reflect MITRE ATT&CK tactics associated with this weakness class, not a working exploit. Not every attack uses every stage.

▪ Related CVEs

No CVEs in the Gold index currently reference CWE-331. New matches appear here as the crawler indexes them.