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Articles

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Application Security

CWE-395 Catching NullPointerException Instead of Checking for Null

Catching NullPointerException hides a bug and costs CPU. CWE-395 explained with a Java example and the plain fix: check before you dereference.

Oct 18, 20263 min read
Application Security

CWE-394 Unexpected Status Code or Return Value: Causes and Fixes

Functions can return legitimate values your code never planned for. CWE-394 explained with four real CVEs on recv, read and null returns, plus the fix pattern.

Oct 18, 20264 min read
Application Security

CWE-393 Return of Wrong Status Code: How It Breaks Security Logic

A function that reports the wrong result makes callers act on a falsehood. CWE-393 explained with real CVEs, including the Apple goto fail bug, and fixes.

Oct 18, 20264 min read
Application Security

CWE-392 Missing Report of Error Condition: Causes and Fixes

When code hits an error and returns success, callers trust a lie. CWE-392 explained through real CVEs, including an authentication bypass, with fixes.

Oct 18, 20264 min read
Application Security

CWE-391 Unchecked Error Condition: Deprecated, Still Useful

CWE-391 is planned for deprecation in favor of CWE-252, CWE-248 and CWE-1069, but the lesson stands: ignored exceptions let attackers induce unnoticed behavior.

Oct 18, 20262 min read
Application Security

CWE-390 Detection of Error Condition Without Action: Fix Guide

Code that notices an error and does nothing leaves the system in a state nobody planned for. CWE-390 explained with examples, a real CVE and the fixes.

Oct 18, 20263 min read
Application Security

CWE-39 Drive Letter Path Traversal: Why C:dirname Matters

CWE-39 covers input with a Windows drive letter that redirects file access somewhere unintended. Here is how it shows up and how to block it.

Oct 18, 20263 min read
Application Security

CWE-386 Symbolic Name Not Mapping to the Correct Object

A path or name that resolves to a different object over time lets attackers redirect your access. CWE-386 explained, with its consequences and checks.

Oct 18, 20262 min read
Application Security

CWE-385 Covert Timing Channel: When Timing Leaks Secrets

How long an operation takes can reveal what it did. CWE-385 explained with plain examples and the fixes MITRE recommends for removing time variance.

Oct 18, 20263 min read

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