What is CWE-229: Improper Handling of Values?

CWE-229: Improper Handling of Values is a Common Weakness Enumeration (CWE) entry maintained by MITRE. The product does not properly handle when the expected number of values for parameters, fields, or arguments is not provided in input, or if those values are undefined.

What are the security consequences of Improper Handling of Values?

If exploited, CWE-229 (Improper Handling of Values) it can compromise Integrity, leading to outcomes such as Unexpected State.

Which programming languages are affected by Improper Handling of Values?

CWE-229 commonly affects Not Language-Specific. Note that weaknesses are often language-agnostic patterns, so secure coding practices apply broadly.

What is the difference between a CWE and a CVE?

A CWE (Common Weakness Enumeration) like CWE-229 describes a category of software weakness — the underlying flaw type. A CVE (Common Vulnerabilities and Exposures) identifies a specific, real-world vulnerability in a particular product. In short, a CWE is the kind of mistake, and a CVE is an instance of that mistake being found in software.

CWE-229: Improper Handling of Values

Detect imprecise mappings involving CWE-229

Review mappings to CWE-229, Improper Handling of Values, with MITRE's mapping and navigation criteria. Flag any selection that points to a View or Category, remains at a higher abstraction than the available evidence supports, or ignores relevant parent, child, peer, and alternative entries. Treat those findings as mapping-quality defects, correct them before publication, and retain the comparison trail for repeatable audits.

CWE Mapping and Navigation Guidance — MITRE CWE

Prevent CWE-229 through an SSDF control plan

Use NIST SSDF practices to make prevention of CWE-229, Improper Handling of Values, an explicit development outcome. Translate the CWE definition into security requirements and design constraints, choose safer implementation patterns and toolchain checks, and define acceptance evidence before release. Feed every confirmed occurrence back into the requirements, design review, and coding rules so the same root cause is removed across the product rather than patched in one location.

NIST SP 800-218 Secure Software Development Framework — National Institute of Standards and Technology

Triage CWE-229 against known exploitation evidence

Use CISA's Known Exploited Vulnerabilities catalog to test whether a vulnerability mapped to CWE-229, Improper Handling of Values, has evidence of exploitation in the wild. Confirm the CVE-to-CWE root-cause mapping independently before attaching the example, then capture the affected product, required action, and remediation deadline. A missing KEV match is not evidence that the weakness is unexploited, and a KEV entry must not be generalized to every occurrence of this CWE.

Known Exploited Vulnerabilities Catalog — Cybersecurity and Infrastructure Security Agency

Use MITRE taxonomy anchors to review Improper Handling of Values

Recorded impacts include Unexpected State; related weaknesses include CWE-228. Use these source-defined anchors to turn CWE-229 into implementation, review, and verification checks for the affected component.

CWE-229: Improper Handling of Values — MITRE CWE

Validate CWE-229 with root-cause mapping checks

Apply MITRE's root-cause mapping quick tips to CWE-229, Improper Handling of Values. Confirm the finding describes the causal weakness rather than an impact or attack pattern, compare the abstraction and mapping notes with plausible alternatives, and have a second reviewer challenge the selection. Preserve the evidence and reasoning so recurring defects can be measured against one consistent identifier.

CVE to CWE Root Cause Mapping Quick Tips — MITRE CWE

CWE-229: Improper Handling of Values

Technical Details

Applicable To

Security Consequences

Scope

Impact

Mitigation Strategies

Detection Methods

Code Examples & CVEs

CWE Relationships

Parent Weaknesses

Source-backed guidance

Detect imprecise mappings involving CWE-229

Prevent CWE-229 through an SSDF control plan

Triage CWE-229 against known exploitation evidence

Use MITRE taxonomy anchors to review Improper Handling of Values

Validate CWE-229 with root-cause mapping checks

Frequently Asked Questions

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