CWE-1334 Base Draft

Unauthorized Error Injection Can Degrade Hardware Redundancy

This vulnerability occurs when an attacker without proper permissions can deliberately inject faults into a hardware system's backup components. This action disables the redundancy, forcing the…

Definition

What is CWE-1334?

This vulnerability occurs when an attacker without proper permissions can deliberately inject faults into a hardware system's backup components. This action disables the redundancy, forcing the system into a less secure, degraded state.
Hardware designers often add duplicate components, like backup processors or memory channels, to maintain system performance and reliability if a primary part fails. This vulnerability undermines that safety net by allowing an unauthorized user or process to inject errors into these backup blocks, corrupting them and making the redundant path unusable. Once the redundancy is compromised, the system is forced to operate in a degraded mode with reduced fault tolerance. This weakened state is often the primary goal of the attack, as it makes the entire system more susceptible to follow-up exploits that could cause complete failure or data corruption.
Real-world impact

Real-world CVEs caused by CWE-1334

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-1334

  • Architecture and Design Ensure the design does not allow error injection in modes intended for normal run-time operation. Provide access controls on interfaces for injecting errors.
  • Implementation Disallow error injection in modes which are expected to be used for normal run-time operation. Provide access controls on interfaces for injecting errors.
  • Integration Add an access control layer atop any unprotected interfaces for injecting errors.
Detection signals

How to detect CWE-1334

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-1334 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-1334?

This vulnerability occurs when an attacker without proper permissions can deliberately inject faults into a hardware system's backup components. This action disables the redundancy, forcing the system into a less secure, degraded state.

How serious is CWE-1334?

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-1334?

MITRE lists the following affected platforms: Not OS-Specific, Not Architecture-Specific, Not Technology-Specific.

How can I prevent CWE-1334?

Ensure the design does not allow error injection in modes intended for normal run-time operation. Provide access controls on interfaces for injecting errors. Disallow error injection in modes which are expected to be used for normal run-time operation. Provide access controls on interfaces for injecting errors.

How does Plexicus detect and fix CWE-1334?

Plexicus's SAST engine matches the data-flow signature for CWE-1334 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-1334?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1334.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-1334

CWE-284 Parent

Improper Access Control

The software fails to properly limit who can access a resource, allowing unauthorized users or systems to interact with it.

CWE-1191 Sibling

On-Chip Debug and Test Interface With Improper Access Control

This vulnerability occurs when a hardware chip's debug or test interface (like JTAG) lacks proper access controls. Without correct…

CWE-1220 Sibling

Insufficient Granularity of Access Control

This vulnerability occurs when a system's access controls are too broad, allowing unauthorized users or processes to read or modify…

CWE-1224 Sibling

Improper Restriction of Write-Once Bit Fields

This vulnerability occurs when hardware write-once protection mechanisms, often called 'sticky bits,' are incorrectly implemented,…

CWE-1231 Sibling

Improper Prevention of Lock Bit Modification

This vulnerability occurs when hardware or firmware uses a lock bit to protect critical system registers or memory regions, but fails to…

CWE-1233 Sibling

Security-Sensitive Hardware Controls with Missing Lock Bit Protection

This vulnerability occurs when a hardware device uses a lock bit to protect critical configuration registers, but the lock fails to…

CWE-1252 Sibling

CPU Hardware Not Configured to Support Exclusivity of Write and Execute Operations

This vulnerability occurs when a CPU's hardware is not set up to enforce a strict separation between writing data to memory and executing…

CWE-1257 Sibling

Improper Access Control Applied to Mirrored or Aliased Memory Regions

This vulnerability occurs when a hardware design maps the same physical memory to multiple addresses (aliasing or mirroring) but fails to…

CWE-1259 Sibling

Improper Restriction of Security Token Assignment

This vulnerability occurs when a System-on-a-Chip (SoC) fails to properly secure its Security Token mechanism. These tokens control which…

Resources

Further reading

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