Falhas do tipo CWE-367
799 resultadosCondição de corrida entre verificação e uso (TOCTOU)
A aplicação verifica uma condição (ex: arquivo existe, usuário tem permissão) e depois atua sobre ela, mas entre a verificação e a ação outro processo pode alterar o estado. Um atacante explora esse intervalo para burlar controles de segurança ou acessar recursos que não deveria.
Exemplo
Um programa verifica se um arquivo é seguro para ler (if (arquivo_existe && nao_eh_symlink)), depois abre e processa. Um atacante substitui o arquivo por um symlink apontando para /etc/passwd entre a verificação e a leitura, conseguindo acessar dados sensíveis.
Como mitigar
Use operações atômicas do SO (open com flags O_NOFOLLOW, O_EXCL; fstat em vez de stat; operações que verificam e atuam em uma única chamada). Implemente locks/mutexes se lógica complexa for necessária, e valide o estado novamente após adquirir recurso.
CVE-2021-46795MEDIUMA TOCTOU (time-of-check to time-of-use) vulnerability exists where an attacker may use a compromised BIOS to cause the TEE OS to read memoryEPSS 0.1%CVE-2024-36311MEDIUMA Time-of-check time-of-use (TOCTOU) race condition in the SMM communications buffer could allow a privileged attacker to bypass input validEPSS 0.1%CVE-2022-30283HIGHIn UsbCoreDxe, tampering with the contents of the USB working buffer using DMA while certain USB transactions are in process leads to a TOCTEPSS 0.1%CVE-2026-106413MEDIUMRace condition in Browser in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to spooEPSS 0.1%CVE-2026-58198MEDIUMChatterBot: Symlink-Following Arbitrary Write via UbuntuCorpusTrainerEPSS 0.1%CVE-2026-79994HIGHDocker Sandboxes UDS forwarder can reach arbitrary host Unix sockets through a symlink raceEPSS 0.1%CVE-2026-1880MEDIUMAn Incorrect Permission Assignment for Critical Resource vulnerability in the ASUS DriverHub update process allows privilege escalation due EPSS 0.1%CVE-2025-46415LOWA race condition in the Nix, Lix, and Guix package managers allows the removal of content from arbitrary folders. This affects Nix before 2.EPSS 0.1%CVE-2022-31635HIGHPotential time-of-check to time-of-use (TOCTOU) vulnerabilities have been identified in the BIOS for certain HP PC products, which might allEPSS 0.1%CVE-2022-33909HIGHDMA transactions which are targeted at input buffers used for the HddPassword software SMI handler could cause SMRAM corruption through a TOEPSS 0.1%CVE-2026-24191HIGHNVIDIA Display Driver for Windows contains a vulnerability where an attacker could cause a time-of-check time-of-use issue. A successful expEPSS 0.1%CVE-2022-31636HIGHPotential time-of-check to time-of-use (TOCTOU) vulnerabilities have been identified in the BIOS for certain HP PC products, which might allEPSS 0.1%CVE-2026-20445MEDIUMIn MDDP, there is a possible system crash due to a race condition. This could lead to local denial of service if a malicious actor has alreaEPSS 0.1%CVE-2022-33905HIGHDMA transactions which are targeted at input buffers used for the AhciBusDxe software SMI handler could cause SMRAM corruption (a TOCTOU attEPSS 0.1%CVE-2022-31637HIGHPotential time-of-check to time-of-use (TOCTOU) vulnerabilities have been identified in the BIOS for certain HP PC products, which might allEPSS 0.1%CVE-2022-31639HIGHPotential time-of-check to time-of-use (TOCTOU) vulnerabilities have been identified in the BIOS for certain HP PC products, which might allEPSS 0.1%CVE-2024-37181LOWTime-of-check time-of-use race condition in some Intel(R) Neural Compressor software before version v3.0 may allow an authenticated user to EPSS 0.1%CVE-2022-43777HIGHPotential Time-of-Check to Time-of Use (TOCTOU) vulnerabilities have been identified in the HP BIOS for certain HP PC products which may allEPSS 0.1%CVE-2022-27538HIGHA potential Time-of-Check to Time-of-Use (TOCTOU) vulnerability has been identified in the BIOS for certain HP PC products which may allow aEPSS 0.1%CVE-2022-27539HIGHPotential Time-of-Check to Time-of Use (TOCTOU) vulnerabilities have been identified in the HP BIOS for certain HP PC products which may allEPSS 0.1%