Weaknesses of type CWE-416

5,042 results

Uso após liberação de memória

Ocorre quando o código tenta acessar um bloco de memória que já foi desalocado (free/delete). O ponteiro continua apontando para aquele endereço, mas o dado ali pode ter sido sobrescrito por outra operação, causando comportamento impredizível, corrupção de dados ou execução de código arbitrário.

Example

Um buffer é alocado, depois liberado com free(). Mais adiante, o código ainda tenta ler ou escrever naquele mesmo ponteiro sem verificar. Se um atacante controlar a alocação subsequente daquele endereço, consegue manipular o conteúdo que será lido.

How to mitigate

Anule o ponteiro imediatamente após liberar (ptr = NULL), implemente análise estática para detectar acessos pós-liberação, use ferramentas como valgrind ou AddressSanitizer nos testes, e considere linguagens com gerenciamento automático de memória para código sensível.

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-2021-21035HIGHAcrobat 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-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-2026-45447HIGHHeap Use-After-Free in the PKCS7_verify() FunctionEPSS 4.0%CVE-2021-34853HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 4.0%CVE-2021-34832HIGHThis 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-2021-34844HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 4.0%CVE-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%