Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.
Non-exit on Failed Initialization
This vulnerability occurs when software continues to run as normal after encountering a critical security failure during its startup process. Instead of halting or entering a safe mode, the…
What is CWE-455?
Real-world CVEs caused by CWE-455
-
Product does not trigger a fatal error if missing or invalid ACLs are in a configuration file.
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 Perl
The following code intends to limit certain operations to the administrator only.
$username = GetCurrentUser();
$state = GetStateData($username);
if (defined($state)) {
$uid = ExtractUserID($state);
}
```
# do stuff*
if ($uid == 0) {
```
DoAdminThings();
} Secure pseudo
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
const safe = validateAndEscape(input);
return executeWithGuards(safe);
} How to prevent CWE-455
- Implementation Follow the principle of failing securely when an error occurs. The system should enter a state where it is not vulnerable and will not display sensitive error messages to a potential attacker.
How to detect CWE-455
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-455 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-455?
This vulnerability occurs when software continues to run as normal after encountering a critical security failure during its startup process. Instead of halting or entering a safe mode, the application proceeds with weakened or missing security controls, leaving it exposed.
How serious is CWE-455?
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-455?
MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.
How can I prevent CWE-455?
Follow the principle of failing securely when an error occurs. The system should enter a state where it is not vulnerable and will not display sensitive error messages to a potential attacker.
How does Plexicus detect and fix CWE-455?
Plexicus's SAST engine matches the data-flow signature for CWE-455 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-455?
MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/455.html. You can also reference OWASP and NIST documentation for adjacent guidance.
Weaknesses related to CWE-455
Incorrect Control Flow Scoping
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Use of NullPointerException Catch to Detect NULL Pointer Dereference
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Declaration of Throws for Generic Exception
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Return Inside Finally Block
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Execution After Redirect (EAR)
Execution After Redirect (EAR) occurs when a web application sends a redirect response to a user's browser but continues to run…
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