Falhas do tipo CWE-416

6.170 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-2021-39837HIGHAdobe Acrobat Reader DC AcroForm deleteItemAt Use-After-Free Remote Code Execution VulnerabilityEPSS 65.2%CVE-2021-39839HIGHAdobe Acrobat Reader DC AcroForm getItemAt Use-After-Free Remote Code Execution VulnerabilityEPSS 65.2%CVE-2019-0211HIGHIn Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes orEPSS 65.0%KEVCVE-2021-22901—curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session tEPSS 63.5%CVE-2024-43642HIGHWindows SMB Denial of Service VulnerabilityEPSS 63.1%CVE-2023-49606CRITICALA use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy 1.10.0. A specially crafted HEPSS 63.1%CVE-2018-9958—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.0.1.1049. User interactioEPSS 61.7%CVE-2021-34847HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. User interaEPSS 61.6%CVE-2019-5786MEDIUMObject lifetime issue in Blink in Google Chrome prior to 72.0.3626.121 allowed a remote attacker to potentially perform out of bounds memoryEPSS 61.1%KEVCVE-2021-39840HIGHAdobe Acrobat Reader DC AcroForm Field Use-After-Free Remote Code Execution VulnerabilityEPSS 60.8%CVE-2023-21608HIGHAdobe Acrobat Reader DC resetForm Use-After-Free Remote Code Execution VulnerabilityEPSS 59.4%KEVCVE-2019-3829MEDIUMA vulnerability was found in gnutls versions from 3.5.8 before 3.6.7. A memory corruption (double free) vulnerability in the certificate verEPSS 59.2%CVE-2023-36041HIGHMicrosoft Excel Remote Code Execution VulnerabilityEPSS 56.7%CVE-2026-2441HIGHUse after free in CSS in Google Chrome prior to 145.0.7632.75 allowed a remote attacker to execute arbitrary code inside a sandbox via a craEPSS 55.0%KEVCVE-2021-40728HIGHAdobe Acrobat Reader DC Use After Free Arbitrary Code ExecutionEPSS 54.6%CVE-2016-0984HIGHUse-after-free vulnerability in Adobe Flash Player before 18.0.0.329 and 19.x and 20.x before 20.0.0.306 on Windows and OS X and before 11.2EPSS 54.5%KEVCVE-2021-28640HIGHAdobe Acrobat Reader Use-After-Free Arbitrary Code Execution VulnerabilityEPSS 53.4%CVE-2010-0248HIGHMicrosoft Internet Explorer 6, 6 SP1, 7, and 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrarEPSS 53.1%CVE-2021-28550CRITICALAdobe Acrobat Reader use after free vulnerability could lead to arbitrary code executionEPSS 52.1%KEVCVE-2021-28635HIGHAdobe Acrobat Reader Use-After-Free VulnerabilityEPSS 51.2%