Falhas do tipo CWE-787
5.843 resultadosEscrita fora dos limites de memória
Ocorre quando um programa escreve dados em um endereço de memória fora da área alocada para um buffer ou variável. O código não valida o tamanho ou índice antes de gravar, permitindo sobrescrita de dados adjacentes, corrupção de estruturas críticas ou execução de código arbitrário.
Exemplo
Um formulário web que copia dados do usuário para um buffer de 256 bytes sem validar o tamanho da entrada. Se o atacante envia 500 bytes, a escrita transborda e sobrescreve a pilha, podendo hijackear o endereço de retorno da função.
Como mitigar
Use funções seguras de cópia (strncpy, strlcpy ao invés de strcpy; memcpy com tamanho máximo explícito) e sempre valide comprimento e índices antes de escrever. Em linguagens modernas, prefira estruturas com bounds-checking automático (arrays em Java, Rust, etc).
CVE-2018-20249—In Foxit Quick PDF Library (all versions prior to 16.12), issue where loading a malformed or malicious PDF containing invalid xref entries uEPSS 1.4%CVE-2026-85437CRITICALMOOS-IvP through 24.8.1 Buffer Overflow in IvP Function String DecodersEPSS 1.4%CVE-2022-40962HIGHMozilla developers Nika Layzell, Timothy Nikkel, Sebastian Hengst, Andreas Pehrson, and the Mozilla Fuzzing Team reported memory safety bugsEPSS 1.4%CVE-2022-42998CRITICALD-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the srcip parameter at /goform/form2IPQoSTcAdd.EPSS 1.4%CVE-2021-21703HIGHPHP-FPM memory access in root process leading to privilege escalationEPSS 1.4%CVE-2022-34286—A vulnerability has been identified in PADS Standard/Plus Viewer (All versions). The affected application contains an out of bounds write paEPSS 1.4%CVE-2022-34276—A vulnerability has been identified in PADS Standard/Plus Viewer (All versions). The affected application contains an out of bounds write paEPSS 1.4%CVE-2022-34275—A vulnerability has been identified in PADS Standard/Plus Viewer (All versions). The affected application contains an out of bounds write paEPSS 1.4%CVE-2022-34284—A vulnerability has been identified in PADS Standard/Plus Viewer (All versions). The affected application contains an out of bounds write paEPSS 1.4%CVE-2022-34273—A vulnerability has been identified in PADS Standard/Plus Viewer (All versions). The affected application contains an out of bounds write paEPSS 1.4%CVE-2022-34289—A vulnerability has been identified in PADS Standard/Plus Viewer (All versions). The affected application contains an out of bounds write paEPSS 1.4%CVE-2022-2288HIGHOut-of-bounds Write in vim/vimEPSS 1.4%CVE-2022-34274—A vulnerability has been identified in PADS Standard/Plus Viewer (All versions). The affected application contains an out of bounds write paEPSS 1.4%CVE-2021-31492HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of OpenText Brava! Desktop 16.6.3.84. User inEPSS 1.4%CVE-2021-31484HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of OpenText Brava! Desktop 16.6.3.84. User inEPSS 1.4%CVE-2021-31491HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of OpenText Brava! Desktop 16.6.3.84. User inEPSS 1.4%CVE-2021-31487HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of OpenText Brava! Desktop 16.6.3.84. User inEPSS 1.4%CVE-2021-31496HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of OpenText Brava! Desktop 16.6.3.84. User inEPSS 1.4%CVE-2021-31490HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of OpenText Brava! Desktop 16.6.3.84. User inEPSS 1.4%CVE-2021-31494HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of OpenText Brava! Desktop 16.6.3.84. User inEPSS 1.4%