CWE-600 Variant Draft

Uncaught Exception in Servlet

This vulnerability occurs when a Java Servlet fails to properly catch and handle exceptions, potentially exposing sensitive system information in error messages.

Definition

What is CWE-600?

This vulnerability occurs when a Java Servlet fails to properly catch and handle exceptions, potentially exposing sensitive system information in error messages.
When an unhandled exception occurs in a Servlet, the application server's default error page often returns detailed debugging information directly to the user's browser. This data is extremely valuable to attackers, as it can reveal internal system details like database queries, software versions, and file paths—effectively providing a roadmap for further exploitation. To prevent this, developers must implement comprehensive exception handling that catches all Throwable objects and returns generic, user-friendly error messages. This practice ensures that sensitive technical details remain on the server side in logs, while end-users receive only the information they need, significantly reducing the application's attack surface.
Real-world impact

Real-world CVEs caused by CWE-600

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 Java

The following example attempts to resolve a hostname.

Vulnerable Java 
protected void doPost (HttpServletRequest req, HttpServletResponse res) throws IOException {
  	String ip = req.getRemoteAddr();
  	InetAddress addr = InetAddress.getByName(ip);
  	...
  	out.println("hello " + addr.getHostName());
  }
Secure code example

Secure pseudo

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-600

  • Implementation Implement Exception blocks to handle all types of Exceptions.
Detection signals

How to detect CWE-600

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-600 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-600?

This vulnerability occurs when a Java Servlet fails to properly catch and handle exceptions, potentially exposing sensitive system information in error messages.

How serious is CWE-600?

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-600?

MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.

How can I prevent CWE-600?

Implement Exception blocks to handle all types of Exceptions.

How does Plexicus detect and fix CWE-600?

Plexicus's SAST engine matches the data-flow signature for CWE-600 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-600?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/600.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-600

CWE-248 Parent

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-209 Can precede

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-390 Peer

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.…

Resources

Further reading

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