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-2021-30554HIGHUse after free in WebGL in Google Chrome prior to 91.0.4472.114 allowed a remote attacker to potentially exploit heap corruption via a craftEPSS 7.4%KEVCVE-2024-45434CRITICALOpenSynergy BlueSDK (aka Blue SDK) through 6.x has a Use-After-Free. The specific flaw exists within the BlueSDK Bluetooth stack. The issue EPSS 7.2%CVE-2019-5018HIGHAn exploitable use after free vulnerability exists in the window function functionality of Sqlite3 3.26.0. A specially crafted SQL command cEPSS 6.7%CVE-2024-43504HIGHMicrosoft Excel Remote Code Execution VulnerabilityEPSS 6.5%CVE-2022-4379HIGHA use-after-free vulnerability was found in __nfs42_ssc_open() in fs/nfs/nfs4file.c in the Linux kernel. This flaw allows an attacker to conEPSS 6.3%CVE-2019-17142HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PhantomPDF 9.6.0.25114. User interacEPSS 6.3%CVE-2021-45063LOWAdobe Acrobat Reader DC JP2 File Parsing Use-After-Free Information Disclosure VulnerabilityEPSS 6.2%CVE-2022-34219HIGHAdobe Acrobat Reader DC Font Parsing Use-After-Free Remote Code Execution VulnerabilityEPSS 6.2%CVE-2022-34216HIGHAdobe Acrobat Reader DC PDF Parsing Use-After-Free Remote Code Execution VulnerabilityEPSS 6.2%CVE-2026-68820HIGHWindows Ancillary Function Driver for WinSock Elevation of Privilege VulnerabilityEPSS 6.2%KEVCVE-2021-21831HIGHA use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 10.1.3.37598. A specially crafted PDFEPSS 6.2%CVE-2020-8857HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit Reader 9.7.0.29455. User interactionEPSS 6.1%CVE-2020-8855HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PhantomPDF 9.7.0.2947. User interactEPSS 6.1%CVE-2021-3962—A flaw was found in ImageMagick where it did not properly sanitize certain input before using it to invoke convert processes. This flaw alloEPSS 6.0%CVE-2022-23308HIGHvalid.c in libxml2 before 2.9.13 has a use-after-free of ID and IDREF attributes.EPSS 6.0%CVE-2022-2588MEDIUMIt was discovered that the cls_route filter implementation in the Linux kernel would not remove an old filter from the hashtable before freeEPSS 5.9%CVE-2023-35382HIGHWindows Kernel Elevation of Privilege VulnerabilityEPSS 5.6%CVE-2024-26182HIGHWindows Kernel Elevation of Privilege VulnerabilityEPSS 5.6%CVE-2021-40726HIGHAdobe Acrobat Reader DC AcroForm Field Use-After-Free Remote Code Execution VulnerabilityEPSS 5.3%CVE-2021-40725HIGHAdobe Acrobat Reader DC AcroForm listbox Use-After-Free Remote Code Execution VulnerabilityEPSS 5.3%