COMMON WEAKNESS ENUMERATIONDraft

CWE-570

Expression is Always False

The product contains an expression that will always evaluate to false.

Abstraction

Base

Structure

Simple

Likelihood of Exploit

Medium

Understand the problem

What is the problem?

The product contains an expression that will always evaluate to false.

Root cause

How and when does the problem arise?

Lifecycle phase

Implementation

Risk

What does successful exploitation lead to?

Quality DegradationVaries by Context

Affected security scopes: Other

Defence

How is it prevented and fixed?

Implementation

Refactoring

Detail
Consider refactoring the code, or determine if the code is not including a condition that could cause the expression to become false.

Verification

How is it detected?

Automated Static Analysis

High
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)