Falhas do tipo CWE-416

5.036 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-2024-20683HIGHWin32k Elevation of Privilege VulnerabilityEPSS 4.2%CVE-2019-6734—This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Foxit PhantomPDF. User interactiEPSS 4.2%CVE-2026-20871HIGHDesktop Window Manager Elevation of Privilege VulnerabilityEPSS 4.2%CVE-2019-6730—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader. User interaction is requirEPSS 4.2%CVE-2019-6727—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader. User interaction is requirEPSS 4.2%CVE-2021-21033HIGHAcrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code ExecutionEPSS 4.1%CVE-2021-21021HIGHAcrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code ExecutionEPSS 4.1%CVE-2021-21028HIGHAcrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code ExecutionEPSS 4.1%CVE-2021-21035HIGHAcrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code ExecutionEPSS 4.1%CVE-2019-13320HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit Reader 9.5.0.20723. User interactionEPSS 4.1%CVE-2019-13319HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit Reader 9.5.0.20723. User interactionEPSS 4.1%CVE-2020-15637LOWThis vulnerability allows remote attackers to disclose sensitive information on affected installations of Foxit PhantomPDF 9.7.1.29511. UserEPSS 4.1%CVE-2022-23608HIGHUse after free in PJSIPEPSS 4.1%CVE-2021-34841HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 4.0%CVE-2021-34844HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 4.0%CVE-2023-36743HIGHWin32k Elevation of Privilege VulnerabilityEPSS 4.0%CVE-2021-34840HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 4.0%CVE-2021-34846HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 4.0%CVE-2021-34851HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 4.0%CVE-2021-34837HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 4.0%