What is CWE-482: Comparing instead of Assigning?

CWE-482: Comparing instead of Assigning is a Common Weakness Enumeration (CWE) entry maintained by MITRE. The code uses an operator for comparison when the intention was to perform an assignment. In many languages, the compare statement is very close in appearance to the assignment statement; they are often confused.

What are the security consequences of Comparing instead of Assigning?

If exploited, CWE-482 (Comparing instead of Assigning) it can compromise Availability and Integrity, leading to outcomes such as Unexpected State.

How do you prevent or mitigate Comparing instead of Assigning?

Recommended mitigations for CWE-482 include: Many IDEs and static analysis products will detect this problem.

Which programming languages are affected by Comparing instead of Assigning?

CWE-482 commonly affects C and C++. 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-482 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-482: Comparing instead of Assigning

Verify controls for CWE-482 with SSDF evidence

Use NIST SSDF verification and vulnerability-response practices to detect CWE-482, Comparing instead of Assigning, throughout the product lifecycle. Derive review questions, static or dynamic checks, and negative tests from the CWE's causal behavior; define the components and lifecycle stages each check covers; and retain findings with enough evidence to distinguish the root cause from symptoms and impacts. Track escapes and false negatives, then improve the verification plan after every confirmed occurrence.

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

Address Comparing instead of Assigning during Testing

MITRE associates mitigation with Testing; documented detection approaches include Automated Static Analysis, and Automated Static Analysis - Source Code; recorded impacts include Unexpected State. Use these source-defined anchors to turn CWE-482 into implementation, review, and verification checks for the affected component.

CWE-482: Comparing instead of Assigning — MITRE CWE

Triage CWE-482 against known exploitation evidence

Use CISA's Known Exploited Vulnerabilities catalog to test whether a vulnerability mapped to CWE-482, Comparing instead of Assigning, 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

Apply precise root-cause mapping to CWE-482

Apply MITRE's full root-cause mapping guidance when using CWE-482, Comparing instead of Assigning. Separate weakness language from attacker prerequisites and technical impact, check the entry's abstraction and vulnerability-mapping notes, and prefer the most specific Base or Variant supported by the evidence. Record the rejected alternatives and require an independent review before the mapping is used for remediation trends or program metrics.

CVE to CWE Root Cause Mapping Guidance — MITRE CWE

Validate CWE-482 with root-cause mapping checks

Apply MITRE's root-cause mapping quick tips to CWE-482, Comparing instead of Assigning. 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-482: Comparing instead of Assigning

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Source-backed guidance

Verify controls for CWE-482 with SSDF evidence

Address Comparing instead of Assigning during Testing

Triage CWE-482 against known exploitation evidence

Apply precise root-cause mapping to CWE-482

Validate CWE-482 with root-cause mapping checks

Frequently Asked Questions

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