CWE-1246 Base Incomplete

Improper Write Handling in Limited-write Non-Volatile Memories

This vulnerability occurs when a system fails to properly manage write operations on memory hardware that has a limited lifespan, such as Flash or EEPROM. Without correct wear leveling, specific…

Definition

What is CWE-1246?

This vulnerability occurs when a system fails to properly manage write operations on memory hardware that has a limited lifespan, such as Flash or EEPROM. Without correct wear leveling, specific memory cells wear out faster than intended, leading to premature device failure.
Many non-volatile memory chips, like NAND Flash and EEPROM, have a fundamental physical limitation: each memory cell can only be written to or erased a finite number of times. To maximize the overall lifespan of the storage device, a technique called wear leveling is essential. It works by dynamically mapping the system's logical write requests across different physical memory blocks, ensuring that write cycles are distributed evenly instead of repeatedly hitting the same cells. If wear leveling is missing or implemented incorrectly, it creates a critical weakness. An attacker can exploit this by deliberately targeting the same logical addresses with frequent write operations. This causes the underlying physical cells to wear out rapidly, potentially bricking the storage device or making data unreliable far sooner than its rated endurance, which constitutes a denial-of-service attack against the hardware itself.
Real-world impact

Real-world CVEs caused by CWE-1246

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

    An attacker can render a memory line unusable by repeatedly causing a write to the memory line.

  2. 2

    Below is example code from [REF-1058] that the user can execute repeatedly to cause line failure. W is the maximum associativity of any cache in the system; S is the size of the largest cache in the system.

  3. 3

    Without wear leveling, the above attack will be successful. Simple randomization of blocks will not suffice as instead of the original physical block, the randomized physical block will be worn out.

Vulnerable code example

Vulnerable C++

Below is example code from [REF-1058] that the user can execute repeatedly to cause line failure. W is the maximum associativity of any cache in the system; S is the size of the largest cache in the system.

Vulnerable C++ 
// Do aligned alloc of (W+1) arrays each of size S
 while(1) {

```
   for (ii = 0; ii < W + 1; ii++)
  	 array[ii].element[0]++;
 }
Attacker payload

Below is example code from [REF-1058] that the user can execute repeatedly to cause line failure. W is the maximum associativity of any cache in the system; S is the size of the largest cache in the system.

Attacker payload C++ 
// Do aligned alloc of (W+1) arrays each of size S
 while(1) {

```
   for (ii = 0; ii < W + 1; ii++)
  	 array[ii].element[0]++;
 }
Secure code example

Secure Other

Without wear leveling, the above attack will be successful. Simple randomization of blocks will not suffice as instead of the original physical block, the randomized physical block will be worn out.

Secure Other 
Wear leveling must be used to even out writes to the device.
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-1246

  • Architecture and Design / Implementation / Testing Include secure wear leveling algorithms and ensure they may not be bypassed.
Detection signals

How to detect CWE-1246

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-1246 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.

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Frequently asked questions

Frequently asked questions

What is CWE-1246?

This vulnerability occurs when a system fails to properly manage write operations on memory hardware that has a limited lifespan, such as Flash or EEPROM. Without correct wear leveling, specific memory cells wear out faster than intended, leading to premature device failure.

How serious is CWE-1246?

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-1246?

MITRE lists the following affected platforms: Not OS-Specific, Not Architecture-Specific, System on Chip, Memory Hardware, Storage Hardware.

How can I prevent CWE-1246?

Include secure wear leveling algorithms and ensure they may not be bypassed.

How does Plexicus detect and fix CWE-1246?

Plexicus's SAST engine matches the data-flow signature for CWE-1246 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-1246?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1246.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-1246

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CWE-1235 Sibling

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CWE-770 Sibling

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CWE-779 Sibling

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CWE-920 Sibling

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