A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid but is NULL, typically causing a crash or exit.
CWE-476 (NULL Pointer Dereference) is classified as medium severity and falls under the OWASP Top 10 category A06:2021.
The official CWE entry is maintained by MITRE at cwe.mitre.org/data/definitions/476.html.
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