Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.
CWE-392 Base Draft
Missing Report of Error Condition
This vulnerability occurs when a system fails to properly signal that an error has happened. Instead of returning a clear error code, status, or exception, the software continues as if nothing went…
Definition
What is CWE-392?
This vulnerability occurs when a system fails to properly signal that an error has happened. Instead of returning a clear error code, status, or exception, the software continues as if nothing went wrong, leaving other components unaware of the failure.
When a function or system component encounters a problem but doesn't report it, the calling code assumes success and proceeds with invalid or corrupted data. This silent failure can cause cascading issues like data corruption, security bypasses, or system crashes further down the line, making debugging extremely difficult because the original error point is hidden.
To prevent this, developers should design consistent error-handling contracts. Every function should explicitly return a status code, throw an exception, or use a language-specific mechanism to communicate failure. Logging the error internally is not enough—the calling process must receive a clear, actionable signal to handle the condition appropriately and avoid operating on unsafe assumptions.
Real-world impact
Real-world CVEs caused by CWE-392
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Chain: JavaScript-based cryptocurrency library can fall back to the insecure Math.random() function instead of reporting a failure (CWE-392), thus reducing the entropy (CWE-332) and leading to generation of non-unique cryptographic keys for Bitcoin wallets (CWE-1391)
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Function returns "OK" even if another function returns a different status code than expected, leading to accepting an invalid PIN number.
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Error checking routine in PKCS#11 library returns "OK" status even when invalid signature is detected, allowing spoofed messages.
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Kernel function truncates long pathnames without generating an error, leading to operation on wrong directory.
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Function returns non-error value when a particular erroneous condition is encountered, leading to resultant NULL dereference.
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 Java
In the following snippet from a doPost() servlet method, the server returns "200 OK" (default) even if an error occurs.
try {
```
// Something that may throw an exception.*
...} catch (Throwable t) {
```
logger.error("Caught: " + t.toString());
return;
} 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-392
- 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-392
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-392 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-392?
How serious is CWE-392?
What languages or platforms are affected by CWE-392?
How can I prevent CWE-392?
How does Plexicus detect and fix CWE-392?
Where can I learn more about CWE-392?
Frequently asked questions
What is CWE-392?
This vulnerability occurs when a system fails to properly signal that an error has happened. Instead of returning a clear error code, status, or exception, the software continues as if nothing went wrong, leaving other components unaware of the failure.
How serious is CWE-392?
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-392?
MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.
How can I prevent CWE-392?
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-392?
Plexicus's SAST engine matches the data-flow signature for CWE-392 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-392?
MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/392.html. You can also reference OWASP and NIST documentation for adjacent guidance.
Related weaknesses
Weaknesses related to CWE-392
CWE-755 Parent
Improper Handling of Exceptional Conditions
This vulnerability occurs when software fails to properly manage unexpected situations or errors, leaving it in an unstable or insecure…
CWE-209 Sibling
Generation of Error Message Containing Sensitive Information
This vulnerability occurs when an application reveals sensitive details about its internal systems, user data, or environment within error…
CWE-248 Sibling
Uncaught Exception
This vulnerability occurs when a function throws an error or exception, but the calling code does not have a proper handler to catch and…
CWE-274 Sibling
Improper Handling of Insufficient Privileges
This vulnerability occurs when an application fails to properly manage situations where it lacks the necessary permissions to execute an…
CWE-280 Sibling
Improper Handling of Insufficient Permissions or Privileges
This vulnerability occurs when a system fails to properly manage situations where it lacks the necessary permissions to perform an action…
CWE-333 Sibling
Improper Handling of Insufficient Entropy in TRNG
This vulnerability occurs when a system fails to properly manage the limited or unpredictable output rate of a true random number…
CWE-390 Sibling
Detection of Error Condition Without Action
This weakness occurs when software successfully identifies an error condition but then fails to take any meaningful action to address it.…
CWE-395 Sibling
Use of NullPointerException Catch to Detect NULL Pointer Dereference
Using a try-catch block for NullPointerException as a substitute for proper null checks is an anti-pattern. This approach masks the root…
CWE-396 Sibling
Declaration of Catch for Generic Exception
This weakness occurs when code catches a generic exception type like 'Exception' or 'Throwable', which can hide specific errors and create…
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