CWE-1102 Base Incomplete

Reliance on Machine-Dependent Data Representation

This weakness occurs when software directly depends on how a specific machine, processor, or operating system represents data in memory. Code that makes assumptions about byte order, data type…

Definition

What is CWE-1102?

This weakness occurs when software directly depends on how a specific machine, processor, or operating system represents data in memory. Code that makes assumptions about byte order, data type sizes, or memory alignment becomes fragile and non-portable.
Writing code that relies on machine-specific details like byte order (endianness), integer sizes, or structure padding creates a significant maintenance burden. When you need to port the software to a different architecture, these hidden dependencies cause crashes, data corruption, and subtle bugs that are difficult to trace. This fragility indirectly harms security because developers spend excessive time fixing portability issues instead of focusing on security flaws. Furthermore, this practice makes the codebase more error-prone and complex, increasing the chance of introducing actual vulnerabilities during fixes or adaptations. Security reviews become harder as the logic is obscured by low-level platform quirks. To build secure and robust software, always use platform-independent data formats and language-provided type definitions for serialization and data exchange.
Real-world impact

Real-world CVEs caused by CWE-1102

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 pseudo

MITRE has not published a code example for this CWE. The pattern below is illustrative — see Resources for canonical references.

Vulnerable pseudo 
// Example pattern — see MITRE for the canonical references.
function handleRequest(input) {
  // Untrusted input flows directly into the sensitive sink.
  return executeUnsafe(input);
}
Secure code example

Secure pseudo

Secure pseudo 
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
  const safe = validateAndEscape(input);
  return executeWithGuards(safe);
}
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-1102

  • Architecture Use safe-by-default frameworks and APIs that prevent the unsafe pattern from being expressible.
  • Implementation Validate input at trust boundaries; use allowlists, not denylists.
  • Implementation Apply the principle of least privilege to credentials, file paths, and runtime permissions.
  • Testing Cover this weakness in CI: SAST rules + targeted unit tests for the data flow.
  • Operation Monitor logs for the runtime signals listed in the next section.
Detection signals

How to detect CWE-1102

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-1102 and opens a fix PR in under 60 seconds.

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Frequently asked questions

Frequently asked questions

What is CWE-1102?

This weakness occurs when software directly depends on how a specific machine, processor, or operating system represents data in memory. Code that makes assumptions about byte order, data type sizes, or memory alignment becomes fragile and non-portable.

How serious is CWE-1102?

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-1102?

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

How can I prevent CWE-1102?

Use safe-by-default frameworks, validate untrusted input at trust boundaries, and apply the principle of least privilege. Cover the data-flow signature in CI with SAST.

How does Plexicus detect and fix CWE-1102?

Plexicus's SAST engine matches the data-flow signature for CWE-1102 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-1102?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1102.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-1102

CWE-758 Parent

Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

This weakness occurs when software depends on specific behaviors of an API, data structure, or system component that are not formally…

CWE-1038 Sibling

Insecure Automated Optimizations

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CWE-1103 Sibling

Use of Platform-Dependent Third Party Components

This weakness occurs when software depends on third-party libraries or components that behave differently or lack support across various…

CWE-1105 Sibling

Insufficient Encapsulation of Machine-Dependent Functionality

This weakness occurs when an application relies on hardware-specific or platform-dependent features but fails to isolate that code from…

CWE-474 Sibling

Use of Function with Inconsistent Implementations

This vulnerability occurs when code relies on a function whose behavior changes across different operating systems or versions, leading to…

CWE-562 Sibling

Return of Stack Variable Address

This vulnerability occurs when a function returns a pointer to its own local variable. Since that variable's memory is on the stack, the…

CWE-587 Sibling

Assignment of a Fixed Address to a Pointer

This vulnerability occurs when code explicitly assigns a hardcoded memory address to a pointer, instead of using a dynamic or null value.

CWE-588 Sibling

Attempt to Access Child of a Non-structure Pointer

This vulnerability occurs when code incorrectly treats a pointer to a basic data type (like an integer) as if it points to a structured…

Resources

Further reading

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