Fallos del tipo CWE-476

2571 resultados

Desreferência de ponteiro nulo autenticada remota

A aplicação tenta acessar um objeto ou endereço de memória que não foi inicializado ou foi definido como nulo, sem verificar essa condição antes. Um atacante autenticado consegue provocar esse acesso inválido enviando dados malformados ou inesperados, causando crash ou comportamento indefinido.

Ejemplo

Um endpoint autenticado de API recebe um ID de usuário, faz uma busca no banco que retorna nulo (usuário não existe) e tenta acessar diretamente campos desse objeto nulo sem validação — resultando em erro 500 ou travamento da aplicação.

Cómo mitigar

Sempre verificar se um objeto é nulo antes de usá-lo; usar análise estática (linters, SAST) para detectar acessos potenciais a nulos; validar e tratar casos onde dados esperados podem estar ausentes, mesmo que o usuário esteja autenticado.

CVE-2021-43016MEDIUMAdobe InCopy NULL Pointer Dereference Application Denial of ServiceEPSS 2.1%CVE-2023-21757HIGHWindows Layer 2 Tunneling Protocol (L2TP) Denial of Service VulnerabilityEPSS 2.1%CVE-2023-21683HIGHWindows Internet Key Exchange (IKE) Extension Denial of Service VulnerabilityEPSS 2.0%CVE-2019-5055HIGHAn exploitable denial-of-service vulnerability exists in the Host Access Point Daemon (hostapd) on the NETGEAR N300 (WNR2000v5 with FirmwareEPSS 2.0%CVE-2023-2953HIGHA vulnerability was found in openldap. This security flaw causes a null pointer dereference in ber_memalloc_x() function.EPSS 2.0%CVE-2025-0492HIGHD-Link DIR-823X FUN_00412244 null pointer dereferenceEPSS 2.0%CVE-2023-24938MEDIUMWindows CryptoAPI Denial of Service VulnerabilityEPSS 2.0%CVE-2019-12647HIGHCisco IOS and IOS XE Software IP Ident Denial of Service VulnerabilityEPSS 2.0%CVE-2019-12654HIGHCisco IOS and IOS XE Software Session Initiation Protocol Denial of Service VulnerabilityEPSS 2.0%CVE-2020-26235MEDIUMSegmentation fault in Rust time crateEPSS 2.0%CVE-2023-35338HIGHWindows Peer Name Resolution Protocol Denial of Service VulnerabilityEPSS 2.0%CVE-2021-42528MEDIUMXMP-Toolkit Null Pointer Dereference Application denial-of-serviceEPSS 2.0%CVE-2021-41689HIGHDCMTK through 3.6.6 does not handle string copy properly. Sending specific requests to the dcmqrdb program, it would query its database and EPSS 1.9%CVE-2021-39852MEDIUMAdobe Acrobat Reader DC Null Pointer Dereference Could Lead To Application Denial-of-ServiceEPSS 1.9%CVE-2021-39850MEDIUMAdobe Acrobat Reader DC Null Pointer Dereference Could Lead To Application Denial-of-ServiceEPSS 1.9%CVE-2021-39849MEDIUMAdobe Acrobat Reader DC Null Pointer Dereference Could Lead To Application Denial-of-ServiceEPSS 1.9%CVE-2021-39851MEDIUMAdobe Acrobat Reader DC Null Pointer Dereference Could Lead To Application Denial-of-ServiceEPSS 1.9%CVE-2025-33057MEDIUMWindows Local Security Authority (LSA) Denial of Service VulnerabilityEPSS 1.9%CVE-2025-11847MEDIUMA null pointer dereference vulnerability in the IP settings CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9.6)C0EPSS 1.9%CVE-2021-20274—A flaw was found in privoxy before 3.0.32. A crash may occur due a NULL-pointer dereference when the socks server misbehaves.EPSS 1.9%