Fallos del tipo CWE-787

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Escrita fora dos limites de memória

Ocorre quando um programa escreve dados em uma posição de memória fora do intervalo alocado para um buffer, array ou estrutura. O atacante aproveita para sobrescrever dados adjacentes (variáveis, ponteiros, pilha de retorno), alterando o comportamento da aplicação ou assumindo controle total do sistema.

Ejemplo

Um programa lê 256 bytes de entrada do usuário e copia para um buffer de 64 bytes sem validação. O atacante envia 300 bytes, que transbordam o buffer e sobrescrevem o endereço de retorno na pilha, permitindo execução de código arbitrário.

Cómo mitigar

Sempre validar tamanho de entrada contra o limite do buffer antes de copiar (usar strncpy, snprintf em vez de strcpy, sprintf). Em linguagens modernas, usar estruturas bounds-checked (Rust, C# arrays) ou linters que detectem padrões perigosos.

CVE-2024-6819HIGHIrfanView PSP File Parsing Out-Of-Bounds Write Remote Code Execution VulnerabilityEPSS 0.5%CVE-2026-28956MEDIUMA memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.EPSS 0.5%CVE-2021-47719HIGHCNC_Ctrl DllUnregisterServer f5501 Access ViolationEPSS 0.5%CVE-2024-6818HIGHIrfanView PSP File Parsing Out-Of-Bounds Write Remote Code Execution VulnerabilityEPSS 0.5%CVE-2024-6820HIGHIrfanView AWD File Parsing Out-Of-Bounds Write Remote Code Execution VulnerabilityEPSS 0.5%CVE-2024-6821HIGHIrfanView CIN File Parsing Out-Of-Bounds Write Remote Code Execution VulnerabilityEPSS 0.5%CVE-2023-25671HIGHTensorFlow has segmentation fault in tfg-translate EPSS 0.5%CVE-2022-46324CRITICALSome smartphones have the out-of-bounds write vulnerability. Successful exploitation of this vulnerability may cause system service exceptioEPSS 0.5%CVE-2022-46319CRITICALFingerprint calibration has a vulnerability of lacking boundary judgment. Successful exploitation of this vulnerability may cause out-of-bouEPSS 0.5%CVE-2022-46325CRITICALSome smartphones have the out-of-bounds write vulnerability.Successful exploitation of this vulnerability may cause system service exceptionEPSS 0.5%CVE-2022-46323CRITICALSome smartphones have the out-of-bounds write vulnerability.Successful exploitation of this vulnerability may cause system service exceptionEPSS 0.5%CVE-2026-11928CRITICALSecurity vulnerabilities have been addressed in IBM Verify Identity Access and IBM Security Verify AccessEPSS 0.5%CVE-2022-46326CRITICALSome smartphones have the out-of-bounds write vulnerability. Successful exploitation of this vulnerability may cause system service exceptioEPSS 0.5%CVE-2022-20769HIGHCisco Wireless LAN Controller AireOS Software FIPS Mode Denial of Service VulnerabilityEPSS 0.5%CVE-2023-26555MEDIUMpraecis_parse in ntpd/refclock_palisade.c in NTP 4.2.8p15 has an out-of-bounds write. Any attack method would be complex, e.g., with a manipEPSS 0.5%CVE-2023-42869HIGHMultiple memory corruption issues were addressed with improved input validation. This issue is fixed in macOS Ventura 13.4, iOS 16.5 and iPaEPSS 0.5%CVE-2026-54900MEDIUMOj: Negative-Size memcpy in Oj::Parser create_id Attribute HandlingEPSS 0.5%CVE-2026-44049HIGHOut-of-bounds write in convert_charset() null terminationEPSS 0.5%CVE-2026-20067MEDIUMMultiple Cisco Products Snort 3 TBD Denial of Service VulnerabilityEPSS 0.5%CVE-2026-64739HIGHAn out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6 anEPSS 0.5%