Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.
CWE-1041 Base Incomplete
Use of Redundant Code
This weakness occurs when a codebase contains identical or nearly identical logic duplicated across multiple functions, methods, or modules. This redundancy creates unnecessary complexity and…
Definition
What is CWE-1041?
This weakness occurs when a codebase contains identical or nearly identical logic duplicated across multiple functions, methods, or modules. This redundancy creates unnecessary complexity and maintenance overhead.
Redundant code directly undermines maintainability and indirectly harms security. When the same logic exists in multiple places, fixing a bug or vulnerability in one location is easily missed in another, leaving the system partially patched and inconsistently protected. This inconsistency becomes a breeding ground for security gaps that are difficult to track and eliminate.
For developers, the solution is to consolidate duplicate code into a single, well-defined function or service. This practice, often called the DRY (Don't Repeat Yourself) principle, ensures that fixes and security improvements are applied universally. It reduces codebase size, simplifies testing, and makes the application more secure and easier to audit over its entire lifecycle.
Real-world impact
Real-world CVEs caused by CWE-1041
No public CVE references are linked to this CWE in MITRE's catalog yet.
How attackers exploit it
Step-by-step attacker path
- 1
Identify a code path that handles untrusted input without validation.
- 2
Craft a payload that exercises the unsafe behavior — injection, traversal, overflow, or logic abuse.
- 3
Deliver the payload through a normal request and observe the application's reaction.
- 4
Iterate until the response leaks data, executes attacker code, or escalates privileges.
Vulnerable code example
Vulnerable Java
In the following Java example the code performs some complex math when specific test conditions are met. The math is the same in each case and the equations are repeated within the code. Unfortunately if a future change needs to be made then that change needs to be made in all locations. This opens the door to mistakes being made and the changes not being made in the same way in each instance.
public class Main {
public static void main(String[] args) {
double s = 10.0;
double r = 1.0;
double pi = 3.14159;
double surface_area;
if(r > 0.0) {
// complex math equations
surface_area = pi * r * s + pi * Math.pow(r, 2);
}
if(r > 1.0) {
// a complex set of math
surface_area = pi * r * s + pi * Math.pow(r, 2);
}
}
} Secure code example
Secure Java
It is recommended to place the complex math into its own function and then call that function whenever necessary.
public class Main {
private double ComplexMath(double r, double s) {
//complex math equations
double pi = Math.PI;
double surface_area = pi * r * s + pi * Math.pow(r, 2);
return surface_area;
}
public static void main(String[] args) {
double s = 10.0;
double r = 1.0;
double surface_area;
if(r > 0.0) {
surface_area = ComplexMath(r, s);
}
if(r > 1.0) {
surface_area = ComplexMath(r, s);
}
}
} What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Prevention checklist
How to prevent CWE-1041
- Implementation Merge common functionality into a single function and then call that function from across the entire code base.
Detection signals
How to detect CWE-1041
Run dynamic application security testing against the live endpoint.
Watch runtime logs for unusual exception traces, malformed input, or authorization bypass attempts.
Code review: flag any new code that handles input from this surface without using the validated framework helpers.
CWE-1041
Don't catalog this weakness. Prove it's reachable.
Plexicus turns CWE catalogs into evidence: every CWE-pattern is matched against your real code graph, reach is proven on a sandbox clone, and verified findings ship as reviewed PRs.
Frequently asked questions What is CWE-1041?
How serious is CWE-1041?
What languages or platforms are affected by CWE-1041?
How can I prevent CWE-1041?
How does Plexicus detect and fix CWE-1041?
Where can I learn more about CWE-1041?
Frequently asked questions
What is CWE-1041?
This weakness occurs when a codebase contains identical or nearly identical logic duplicated across multiple functions, methods, or modules. This redundancy creates unnecessary complexity and maintenance overhead.
How serious is CWE-1041?
MITRE has not published a likelihood-of-exploit rating for this weakness. Treat it as medium-impact until your threat model proves otherwise.
What languages or platforms are affected by CWE-1041?
MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.
How can I prevent CWE-1041?
Merge common functionality into a single function and then call that function from across the entire code base.
How does Plexicus detect and fix CWE-1041?
Plexicus's SAST engine matches the data-flow signature for CWE-1041 on every commit. When a match is found, our Codex Remedium agent opens a fix PR with the corrected code, tests, and a one-line summary for the reviewer.
Where can I learn more about CWE-1041?
MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1041.html. You can also reference OWASP and NIST documentation for adjacent guidance.
Related weaknesses
Weaknesses related to CWE-1041
CWE-710 Parent
Improper Adherence to Coding Standards
This weakness occurs when developers don't consistently follow established coding standards and best practices, which can introduce…
CWE-1044 Sibling
Architecture with Number of Horizontal Layers Outside of Expected Range
This occurs when a software system is built with either too many or too few distinct architectural layers, falling outside a recommended…
CWE-1048 Sibling
Invokable Control Element with Large Number of Outward Calls
This weakness occurs when a single function, method, or callable code block makes an excessively high number of calls to other objects or…
CWE-1059 Sibling
Insufficient Technical Documentation
This weakness occurs when a software or hardware product lacks comprehensive technical documentation. Missing or incomplete details about…
CWE-1061 Sibling
Insufficient Encapsulation
This weakness occurs when a software component exposes too much of its internal workings, such as data structures or implementation logic.…
CWE-1065 Sibling
Runtime Resource Management Control Element in a Component Built to Run on Application Servers
This weakness occurs when an application built to run on a managed application server bypasses the server's high-level APIs and instead…
CWE-1066 Sibling
Missing Serialization Control Element
This weakness occurs when a class or data structure is marked as serializable but lacks the required control methods to properly handle…
CWE-1068 Sibling
Inconsistency Between Implementation and Documented Design
This weakness occurs when the actual code implementation deviates from the intended design described in its official documentation,…
CWE-1076 Sibling
Insufficient Adherence to Expected Conventions
This weakness occurs when software code, design, documentation, or other components fail to follow established industry or…
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