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Home/CWEs/CWE-311
Common Weakness Enumeration

CWE-311: Missing Encryption of Sensitive Data

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Sensitive data is stored or transmitted without encryption.

Abstraction
Class
OWASP Top 10
A02:2021 (#2)
Exploit Likelihood
Medium
Related CVEs
0

How to mitigate

Encrypt in transit (TLS) and at rest with modern algorithms; manage keys in a KMS.

▪References & documentation

https://cwe.mitre.org/data/definitions/311.htmlNVD CWE listing

▪ How attackers exploit CWE-311

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

T1005Data from Local SystemcollectionT1036MasqueradingstealthT1040Network Sniffingcredential-access · discoveryT1056Input Capturecollection · credential-accessT1111Multi-Factor Authentication Interceptioncredential-accessT1539Steal Web Session Cookiecredential-accessT1552Unsecured Credentialscredential-accessT1553Subvert Trust Controlsdefense-impairmentT1557Adversary-in-the-Middlecredential-access · collectionT1589Gather Victim Identity Informationreconnaissance

Step-by-step: how CWE-311 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
    Reconnaissancereconnaissance

    Study the target to find the weakness before touching it.

    At risk / what's stolen

    Exposed version info, error messages, and endpoints that reveal the vulnerable component.

    How you defend

    Minimise information disclosure; hide version banners and verbose errors.

  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.

  3. 3
    Discoverydiscovery

    Map what else is reachable — hosts, services, data stores, and accounts.

    At risk / what's stolen

    Internal topology, service inventory, and data locations the attacker enumerates.

    How you defend

    Network segmentation and detection of unusual internal scanning.

  4. 4
    Collectioncollection

    Gather the valuable data before taking it out.

    At risk / what's stolen

    Databases, files, customer records, source code, and business data.

    How you defend

    Data-access monitoring, encryption at rest, and least-privilege data access.

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-311. New matches appear here as the crawler indexes them.