CWE-1025 Base Incomplete

Comparison Using Wrong Factors

This weakness occurs when a program compares two items but checks the wrong properties or attributes. This flawed comparison leads to incorrect decisions, creating security and logic errors.

Definition

What is CWE-1025?

This weakness occurs when a program compares two items but checks the wrong properties or attributes. This flawed comparison leads to incorrect decisions, creating security and logic errors.
At its core, this bug happens because the comparison logic doesn't align with the developer's actual intent. For instance, you might intend to compare the data inside two objects, but the code accidentally compares their memory addresses instead. This causes two objects with identical content to be seen as different, breaking the program's expected flow. To prevent this, always verify that your comparison operators or custom equality methods are evaluating the correct, relevant characteristics. In object-oriented languages, this often means overriding the standard equality method to compare internal state, not object references. For primitive data, ensure you're not mistakenly comparing metadata (like string lengths as a proxy for content) instead of the values themselves.
Real-world impact

Real-world CVEs caused by CWE-1025

No public CVE references are linked to this CWE in MITRE's catalog yet.

How attackers exploit it

Step-by-step attacker path

  1. 1

    Identify a code path that handles untrusted input without validation.

  2. 2

    Craft a payload that exercises the unsafe behavior — injection, traversal, overflow, or logic abuse.

  3. 3

    Deliver the payload through a normal request and observe the application's reaction.

  4. 4

    Iterate until the response leaks data, executes attacker code, or escalates privileges.

Vulnerable code example

Vulnerable Java

In the example below, two Java String objects are declared and initialized with the same string values. An if statement is used to determine if the strings are equivalent.

Vulnerable Java 
String str1 = new String("Hello");
  String str2 = new String("Hello");
  if (str1 == str2) {
  	System.out.println("str1 == str2");
  }
Secure code example

Secure Java

However, the if statement will not be executed as the strings are compared using the "==" operator. For Java objects, such as String objects, the "==" operator compares object references, not object values. While the two String objects above contain the same string values, they refer to different object references, so the System.out.println statement will not be executed. To compare object values, the previous code could be modified to use the equals method:

Secure Java 
if (str1.equals(str2)) {
  	System.out.println("str1 equals str2");
  }
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-1025

  • Testing Thoroughly test the comparison scheme before deploying code into production. Perform positive testing as well as negative testing.
Detection signals

How to detect CWE-1025

SAST High

Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.

DAST Moderate

Run dynamic application security testing against the live endpoint.

Runtime Moderate

Watch runtime logs for unusual exception traces, malformed input, or authorization bypass attempts.

Code review Moderate

Code review: flag any new code that handles input from this surface without using the validated framework helpers.

Plexicus auto-fix

Plexicus auto-detects CWE-1025 and opens a fix PR in under 60 seconds.

Codex Remedium scans every commit, identifies this exact weakness, and ships a reviewer-ready pull request with the patch. No tickets. No hand-offs.

Get a demo Try Plexicus free
Frequently asked questions

Frequently asked questions

What is CWE-1025?

This weakness occurs when a program compares two items but checks the wrong properties or attributes. This flawed comparison leads to incorrect decisions, creating security and logic errors.

How serious is CWE-1025?

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-1025?

MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.

How can I prevent CWE-1025?

Thoroughly test the comparison scheme before deploying code into production. Perform positive testing as well as negative testing.

How does Plexicus detect and fix CWE-1025?

Plexicus's SAST engine matches the data-flow signature for CWE-1025 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-1025?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1025.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-1025

CWE-697 Parent

Incorrect Comparison

This weakness occurs when a security-critical decision relies on a flawed comparison between two pieces of data. The incorrect logic can…

CWE-1023 Sibling

Incomplete Comparison with Missing Factors

This weakness occurs when a program compares two items but fails to check all the necessary attributes that define their true…

CWE-1024 Sibling

Comparison of Incompatible Types

This vulnerability occurs when code directly compares two values of fundamentally different data types, which can lead to unreliable or…

CWE-1039 Sibling

Inadequate Detection or Handling of Adversarial Input Perturbations in Automated Recognition Mechanism

This vulnerability occurs when a system uses automated AI or machine learning to classify complex inputs like images, audio, or text, but…

CWE-1077 Sibling

Floating Point Comparison with Incorrect Operator

This vulnerability occurs when code compares two floating-point numbers using direct equality operators (like == or !=) without accounting…

CWE-1254 Sibling

Incorrect Comparison Logic Granularity

This vulnerability occurs when a system compares sensitive data, like passwords or authentication tokens, piece-by-piece instead of as a…

CWE-183 Sibling

Permissive List of Allowed Inputs

This vulnerability occurs when an application's security filter uses an allowlist that is too broad, mistakenly permitting dangerous…

CWE-185 Sibling

Incorrect Regular Expression

This vulnerability occurs when a regular expression is written incorrectly, causing it to match or validate data in unintended and…

CWE-581 Sibling

Object Model Violation: Just One of Equals and Hashcode Defined

This vulnerability occurs when a Java class defines either the equals() method or the hashCode() method, but not both, breaking a…

Resources

Further reading

Ready when you are

Don't Let Security
Weigh You Down.

Stop choosing between AI velocity and security debt. Plexicus is the only platform that runs Vibe Coding Security and ASPM in parallel — one workflow, every codebase.

Get started free Book a demo