Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.
CWE-344 Base Draft
Use of Invariant Value in Dynamically Changing Context
This vulnerability occurs when code uses a fixed, unchanging value (like a hardcoded string, number, or reference) in a situation where that value should actually be flexible and adapt to different…
Definition
What is CWE-344?
This vulnerability occurs when code uses a fixed, unchanging value (like a hardcoded string, number, or reference) in a situation where that value should actually be flexible and adapt to different runtime conditions or environments.
Developers often hardcode values like file paths, configuration settings, API endpoints, or cryptographic keys for simplicity during initial development. The problem arises when the application is deployed across different stages (like development, testing, and production) or for different users, as these invariant values fail to adjust. This forces the same static value to be used everywhere, which typically breaks functionality, exposes sensitive data, or creates security misconfigurations.
To prevent this, you should externalize all environment-specific values into configuration files, environment variables, or secure secret management services. This practice, central to DevOps and secure CI/CD pipelines, ensures your application can dynamically pull the correct database credentials, service URLs, or feature flags for each specific deployment context without requiring code changes.
Real-world impact
Real-world CVEs caused by CWE-344
-
Component for web browser writes an error message to a known location, which can then be referenced by attackers to process HTML/script in a less restrictive context
How attackers exploit it
Step-by-step attacker path
- 1
The following code is an example of an internal hard-coded password in the back-end:
- 2
Every instance of this program can be placed into diagnostic mode with the same password. Even worse is the fact that if this program is distributed as a binary-only distribution, it is very difficult to change that password or disable this "functionality."
- 3
This code assumes a particular function will always be found at a particular address. It assigns a pointer to that address and calls the function.
- 4
The same function may not always be found at the same memory address. This could lead to a crash, or an attacker may alter the memory at the expected address, leading to arbitrary code execution.
Vulnerable code example
Vulnerable C
The following code is an example of an internal hard-coded password in the back-end:
int VerifyAdmin(char *password) {
if (strcmp(password, "Mew!")) {
printf("Incorrect Password!\n");
return(0)
}
printf("Entering Diagnostic Mode...\n");
return(1);
} 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-344
- 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-344
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-344 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-344?
How serious is CWE-344?
What languages or platforms are affected by CWE-344?
How can I prevent CWE-344?
How does Plexicus detect and fix CWE-344?
Where can I learn more about CWE-344?
Frequently asked questions
What is CWE-344?
This vulnerability occurs when code uses a fixed, unchanging value (like a hardcoded string, number, or reference) in a situation where that value should actually be flexible and adapt to different runtime conditions or environments.
How serious is CWE-344?
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-344?
MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.
How can I prevent CWE-344?
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-344?
Plexicus's SAST engine matches the data-flow signature for CWE-344 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-344?
MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/344.html. You can also reference OWASP and NIST documentation for adjacent guidance.
Related weaknesses
Weaknesses related to CWE-344
CWE-330 Parent
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CWE-331 Sibling
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CWE-335 Sibling
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CWE-338 Sibling
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CWE-340 Sibling
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CWE-323 Child
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