Falhas do tipo CWE-416

5.038 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-2022-24103HIGHAdobe Acrobat Reader DC Annotation Use-After-Free Remote Code Execution VulnerabilityEPSS 3.5%CVE-2025-5068HIGHUse after free in Blink in Google Chrome prior to 137.0.7151.68 allowed a remote attacker to potentially exploit heap corruption via a craftEPSS 3.5%CVE-2022-34230HIGHAdobe Acrobat Reader Use After Free could lead to Arbitrary code executionEPSS 3.5%CVE-2021-20232CRITICALA flaw was found in gnutls. A use after free issue in client_send_params in lib/ext/pre_shared_key.c may lead to memory corruption and otherEPSS 3.4%CVE-2019-5067CRITICALAn uninitialized memory access vulnerability exists in the way Aspose.PDF 19.2 for C++ handles invalid parent object pointers. A specially cEPSS 3.4%CVE-2018-16840MEDIUMA heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closingEPSS 3.4%CVE-2024-20729HIGHTALOS-2023-1890 - Adobe Acrobat Reader Annot3D object zoom event use-after-free vulnerabilityEPSS 3.4%CVE-2024-2883HIGHUse after free in ANGLE in Google Chrome prior to 123.0.6312.86 allowed a remote attacker to potentially exploit heap corruption via a craftEPSS 3.4%CVE-2023-29303MEDIUMZDI-CAN-20970: Adobe Acrobat Reader DC AcroForm Annotation Use-After-Free Information Disclosure VulnerabilityEPSS 3.4%CVE-2019-6763HIGHThis vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.4.1.16828. User interactiEPSS 3.4%CVE-2024-20734MEDIUMZDI-CAN-22516: Adobe Acrobat Pro DC AcroForm Use-After-Free Information Disclosure VulnerabilityEPSS 3.3%CVE-2018-17672—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.3%CVE-2018-17678—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.3%CVE-2018-17674—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.3%CVE-2018-17673—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.3%CVE-2018-17676—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.3%CVE-2018-17675—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.3%CVE-2018-17677—This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.2.0.9297. User interactioEPSS 3.3%CVE-2022-34232MEDIUMAdobe Acrobat Reader DC Annotation print Use-After-Free Information Disclosure VulnerabilityEPSS 3.3%CVE-2022-34234MEDIUMAdobe Acrobat Reader DC Doc printWithParams Use-After-Free Information Disclosure VulnerabilityEPSS 3.3%