Falhas do tipo CWE-416

5.037 resultados

Uso após liberação de memória

Ocorre quando o código tenta acessar (ler ou escrever) um bloco de memória que já foi liberado (free, delete). O programa mantém um ponteiro para a memória, mas o sistema operacional pode reatribuir essa região para outro uso, causando corrupção de dados, travamento ou execução de código arbitrário.

Exemplo

Um servidor web aloca memória para armazenar dados de sessão do usuário, depois libera essa memória quando a sessão encerra. Se uma thread continuar tentando acessar essa sessão após a liberação, pode ler dados de outra sessão ou sobrescrever dados críticos de outro processo.

Como mitigar

Sempre anule ponteiros após liberar memória (ptr = NULL), use variáveis de controle para rastrear estado de alocação, implemente gerenciamento automático de memória quando possível (smart pointers em C++), e execute testes com sanitizers (AddressSanitizer, Valgrind) durante desenvolvimento e CI/CD.

CVE-2024-21426HIGHMicrosoft SharePoint Server Remote Code Execution VulnerabilityEPSS 3.9%CVE-2023-43000HIGHA use-after-free issue was addressed with improved memory management. This issue is fixed in macOS Ventura 13.5, iOS 16.6 and iPadOS 16.6, SEPSS 3.9%KEVCVE-2021-40730LOWAdobe Acrobat Reader DC JPEG2000 Parsing Use-After-Free Information Disclosure VulnerabilityEPSS 3.9%CVE-2020-24438LOWAcrobat Reader DC Use-After-Free Vulnerability Could Lead to Information DisclosureEPSS 3.9%CVE-2019-17143LOWThis vulnerability allows remote attackers to disclose sensitive information on affected installations of Foxit PhantomPDF 9.6.0.25114. UserEPSS 3.9%CVE-2019-6767HIGHThis vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.4.1.16828. User interactiEPSS 3.9%CVE-2018-17680—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.9%CVE-2018-17682—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.9%CVE-2018-17689—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PhantomPDF 9.2.0.9297. User interaEPSS 3.9%CVE-2018-17698—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PhantomPDF 9.2.0.9297. User interaEPSS 3.9%CVE-2018-17683—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.9%CVE-2018-17688—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PhantomPDF 9.2.0.9297. User interaEPSS 3.9%CVE-2018-17687—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PhantomPDF 9.2.0.9297. User interaEPSS 3.9%CVE-2018-17690—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PhantomPDF 9.2.0.9297. User interaEPSS 3.9%CVE-2018-17681—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.9%CVE-2018-17704—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.9%CVE-2018-17694—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PhantomPDF 9.2.0.9297. User interaEPSS 3.9%CVE-2018-17703—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.9%CVE-2018-17691—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PhantomPDF 9.2.0.9297. User interaEPSS 3.9%CVE-2018-17684—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.9%