Falhas do tipo CWE-457

293 resultados

Uso de variável não inicializada

Quando o código usa uma variável antes de atribuir um valor válido a ela, o programa pode ler lixo de memória (valores aleatórios deixados por outras operações). Isso leva a comportamentos imprevisíveis, falhas, ou no pior caso, a exploração de segurança quando o atacante consegue controlar o que está naquela posição de memória.

Exemplo

Um buffer local declarado em C sem inicialização (char buf[256];) é usado logo depois em memcpy ou sprintf. Se o conteúdo anterior daquela pilha contiver dados sensíveis ou endereços, um vazamento de informação ou corrupção de fluxo de controle pode ocorrer.

Como mitigar

Inicialize sempre as variáveis na declaração (char buf[256] = {0}; ou int x = 0;). Use análise estática (linters, compiler warnings, ferramentas como clang-analyzer) para detectar uso de variáveis não inicializadas antes do deploy. Em linguagens gerenciadas como Java/C#, o compilador já força isso.

CVE-2023-42079LOWPDF-XChange Editor J2K File Parsing Uninitialized Variable Information Disclosure VulnerabilityEPSS 0.4%CVE-2023-42048LOWPDF-XChange Editor J2K File Parsing Uninitialized Variable Information Disclosure VulnerabilityEPSS 0.4%CVE-2025-2024HIGHTrimble SketchUp SKP File Parsing Uninitialized Variable Remote Code Execution VulnerabilityEPSS 0.4%CVE-2025-53644MEDIUMOpenCV contains a use after free buffer write due to an uninitialized pointerEPSS 0.4%CVE-2024-10934CRITICALOpenBSD NFS double-free vulnerabilityEPSS 0.4%CVE-2025-8027MEDIUMJavaScript engine only wrote partial return value to stackEPSS 0.4%CVE-2022-40510CRITICALBuffer copy without checking size of input in Audio.EPSS 0.4%CVE-2023-38088HIGHKofax Power PDF printf Uninitialized Variable Remote Code Execution VulnerabilityEPSS 0.4%CVE-2023-34310HIGHAshlar-Vellum Cobalt Uninitialized Memory Remote Code Execution VulnerabilityEPSS 0.4%CVE-2023-50188HIGHTrimble SketchUp Viewer SKP File Parsing Uninitialized Variable Remote Code Execution VulnerabilityEPSS 0.4%CVE-2025-2520HIGHDereferencing of an uninitialized pointer leads to denial of service.EPSS 0.4%CVE-2024-32625MEDIUMUninitialized scalar fieldEPSS 0.4%CVE-2026-84391MEDIUMA use of uninitialized variable vulnerability in Fortinet FortiAnalyzer 7.6.3 through 7.6.6 may allow attacker to denial of service via SNMPEPSS 0.4%CVE-2025-64181LOWOpenEXR Makes Use of Uninitialized MemoryEPSS 0.4%CVE-2026-15766MEDIUMUninitialized Use in Skia in Google Chrome prior to 150.0.7871.125 allowed a remote attacker to obtain potentially sensitive information froEPSS 0.4%CVE-2026-6748CRITICALUninitialized memory in the Audio/Video: Web Codecs componentEPSS 0.4%CVE-2026-19160LOWUninitialized Use in Skia in Google Chrome prior to 151.0.7922.109 allowed a remote attacker who had compromised the renderer process to leaEPSS 0.4%CVE-2024-7868LOWUninitialized variable in Xpdf 4.05 due to invalid JPEG headerEPSS 0.4%CVE-2026-94018HIGHNetX Duo Web HTTP server releases an uninitialized packet pointer on the PUT Content-Length underflow pathEPSS 0.4%CVE-2026-17757MEDIUMUninitialized Use in Skia in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to leak cross-origin data via a crafted HTML pagEPSS 0.4%