CWE-1320 Base Draft

Improper Protection for Outbound Error Messages and Alert Signals

This vulnerability occurs when hardware alert systems for critical conditions, like overheating or power surges, lack proper security. Untrusted software or agents can disable these warnings or…

Definition

What is CWE-1320?

This vulnerability occurs when hardware alert systems for critical conditions, like overheating or power surges, lack proper security. Untrusted software or agents can disable these warnings or trigger false alarms, preventing the system from taking protective actions.
Hardware devices use sensors to monitor safe operating limits, such as temperature or voltage. These thresholds are typically set by trusted firmware (like BIOS) or hardware fuses. When a sensor detects a dangerous out-of-bounds condition, it should generate a secure alert signal that triggers a protective response—like throttling performance or shutting down to prevent damage. If these alert signals are not properly secured, malicious or untrusted software can interfere. Attackers can mask genuine alerts to let the hardware operate unsafely, or generate false alarms to cause performance degradation or a denial-of-service (DoS). This is commonly seen with thermal and power sensors, where compromised alerts can lead to hardware failure or reduced system availability.
Real-world impact

Real-world CVEs caused by CWE-1320

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 Other

Consider a platform design where a Digital-Thermal Sensor (DTS) is used to monitor temperature and compare that output against a threshold value. If the temperature output equals or exceeds the threshold value, the DTS unit sends an alert signal to the processor. The processor, upon getting the alert, input triggers system shutdown. The alert signal is handled as a General-Purpose-I/O (GPIO) pin in input mode.

Vulnerable Other 
The processor-GPIO controller exposes software-programmable controls that allow untrusted software to reprogram the state of the GPIO pin.
Secure code example

Secure Other

Reprogramming the state of the GPIO pin allows malicious software to trigger spurious alerts or to set the alert pin to a zero value so that thermal sensor alerts are not received by the processor.

Secure Other 
The GPIO alert-signal pin is blocked from untrusted software access and is controlled only by trusted software, such as the System BIOS.
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-1320

  • Architecture and Design Alert signals generated by critical events should be protected from access by untrusted agents. Only hardware or trusted firmware modules should be able to alter the alert configuration.
Detection signals

How to detect CWE-1320

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-1320 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-1320?

This vulnerability occurs when hardware alert systems for critical conditions, like overheating or power surges, lack proper security. Untrusted software or agents can disable these warnings or trigger false alarms, preventing the system from taking protective actions.

How serious is CWE-1320?

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-1320?

MITRE lists the following affected platforms: Not OS-Specific, Not Architecture-Specific, System on Chip, Microcontroller Hardware, Memory Hardware, Power Management Hardware, Processor Hardware, Test/Debug Hardware.

How can I prevent CWE-1320?

Alert signals generated by critical events should be protected from access by untrusted agents. Only hardware or trusted firmware modules should be able to alter the alert configuration.

How does Plexicus detect and fix CWE-1320?

Plexicus's SAST engine matches the data-flow signature for CWE-1320 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-1320?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1320.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-1320

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

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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

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