Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.
CWE-1313 Base Draft
Hardware Allows Activation of Test or Debug Logic at Runtime
This vulnerability occurs when hardware includes test or debug features that remain accessible during normal operation. An attacker can activate these features at runtime to alter the hardware's…
Definition
What is CWE-1313?
This vulnerability occurs when hardware includes test or debug features that remain accessible during normal operation. An attacker can activate these features at runtime to alter the hardware's state, bypass security controls, and potentially leak or manipulate sensitive data.
Attackers exploit this weakness by accessing hardware test modes—like debug interfaces or error injection circuits—that were intended only for development or manufacturing. Once activated, these features can grant unauthorized read/write access to system memory, registers, or buses, allowing an adversary to directly modify the device's behavior or extract secrets.
For example, an accessible debug mode might let an attacker intercept or alter data on a communication bus, leading to malicious message injection. Similarly, runtime error injection could corrupt cryptographic operations or expose keys. These capabilities effectively create backdoors that compromise both system integrity and data confidentiality.
Real-world impact
Real-world CVEs caused by CWE-1313
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Hardware processor allows activation of test or debug logic at runtime.
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Processor allows the activation of test or debug logic at runtime, allowing escalation of privileges
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 pseudo
MITRE has not published a code example for this CWE. The pattern below is illustrative — see Resources for canonical references.
// 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
// 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-1313
- Architecture and Design Insert restrictions on when the hardware's test or debug features can be activated. For example, during normal operating modes, the hardware's privileged modes that allow access to such features cannot be activated. Configuring the hardware to only enter a test or debug mode within a window of opportunity such as during boot or configuration stage. The result is disablement of such test/debug features and associated modes during normal runtime operations.
- Implementation Insert restrictions on when the hardware's test or debug features can be activated. For example, during normal operating modes, the hardware's privileged modes that allow access to such features cannot be activated. Configuring the hardware to only enter a test or debug mode within a window of opportunity such as during boot or configuration stage. The result is disablement of such test/debug features and associated modes during normal runtime operations.
- Integration Insert restrictions on when the hardware's test or debug features can be activated. For example, during normal operating modes, the hardware's privileged modes that allow access to such features cannot be activated. Configuring the hardware to only enter a test or debug mode within a window of opportunity such as during boot or configuration stage. The result is disablement of such test/debug features and associated modes during normal runtime operations.
Detection signals
How to detect CWE-1313
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.
Plexicus auto-detects CWE-1313 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.
Frequently asked questions What is CWE-1313?
How serious is CWE-1313?
What languages or platforms are affected by CWE-1313?
How can I prevent CWE-1313?
How does Plexicus detect and fix CWE-1313?
Where can I learn more about CWE-1313?
Frequently asked questions
What is CWE-1313?
This vulnerability occurs when hardware includes test or debug features that remain accessible during normal operation. An attacker can activate these features at runtime to alter the hardware's state, bypass security controls, and potentially leak or manipulate sensitive data.
How serious is CWE-1313?
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-1313?
MITRE lists the following affected platforms: Not OS-Specific, Not Architecture-Specific, Not Technology-Specific.
How can I prevent CWE-1313?
Insert restrictions on when the hardware's test or debug features can be activated. For example, during normal operating modes, the hardware's privileged modes that allow access to such features cannot be activated. Configuring the hardware to only enter a test or debug mode within a window of opportunity such as during boot or configuration stage. The result is disablement of such test/debug features and associated modes during normal runtime operations. Insert restrictions on when the…
How does Plexicus detect and fix CWE-1313?
Plexicus's SAST engine matches the data-flow signature for CWE-1313 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-1313?
MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1313.html. You can also reference OWASP and NIST documentation for adjacent guidance.
Related weaknesses
Weaknesses related to CWE-1313
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
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CWE-1224 Sibling
Improper Restriction of Write-Once Bit Fields
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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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