Weaknesses of type CWE-20

5,399 results

Validação inadequada de entrada

O software recebe dados do usuário ou de fontes externas, mas não verifica ou verifica de forma incompleta se esses dados têm as propriedades necessárias para processar com segurança. Isso permite que entradas malformadas, maliciosas ou inesperadas passem por controles e causem comportamentos indevidos — desde crashes até injeção de código.

Example

Uma aplicação web recebe um parâmetro numérico via GET, mas não valida se é realmente um número inteiro válido antes de usá-lo em uma consulta SQL. Um atacante envia um valor com caracteres especiais (ex: `1' OR '1'='1`), conseguindo injetar código SQL direto no banco de dados.

How to mitigate

Implemente validação rigorosa na entrada: defina o tipo, formato, comprimento e intervalo esperados; rejeite tudo que não se encaixe. Use listas de caracteres permitidos ('whitelist'), escape de dados para o contexto específico (SQL, HTML, URL) e bibliotecas de validação consolidadas. Nunca confie em dados do cliente.

CVE-2019-1933MEDIUMCisco Email Security Appliance Content Filter Bypass VulnerabilityEPSS 1.2%CVE-2021-29468HIGHArbitrary code execution when checking out an attacker-controlled Git branchEPSS 1.2%CVE-2024-21448MEDIUMMicrosoft Teams for Android Information Disclosure VulnerabilityEPSS 1.2%CVE-2024-24683MEDIUMApache Hop Engine: ID isn't escaped when generating HTMLEPSS 1.2%CVE-2026-81995CRITICALAdobe Experience Manager Forms JEE | Improper Input Validation (CWE-20)EPSS 1.2%CVE-2018-0135—A vulnerability in Cisco Unified Communications Manager could allow an authenticated, remote attacker to access sensitive information on an EPSS 1.2%CVE-2024-12912HIGHAn improper input insertion vulnerability in AiCloud on certain router models may lead to arbitrary command execution. Refer to the '01/02/2EPSS 1.2%CVE-2016-10543—call is an HTTP router that is primarily used by the hapi framework. There exists a bug in call versions 2.0.1-3.0.1 that does not validate EPSS 1.2%CVE-2020-3238HIGHCisco IOx Application Framework Arbitrary File Creation VulnerabilityEPSS 1.2%CVE-2022-22727—A CWE-20: Improper Input Validation vulnerability exists that could allow an unauthenticated attacker to view data, change settings, impact EPSS 1.2%CVE-2016-7073MEDIUMAn issue has been found in PowerDNS before 3.4.11 and 4.0.2, and PowerDNS recursor before 4.0.4, allowing an attacker in position of man-in-EPSS 1.2%CVE-2026-50328HIGHWindows Server Update Service (WSUS) Tampering VulnerabilityEPSS 1.2%CVE-2026-26154HIGHWindows Server Update Service (WSUS) Tampering VulnerabilityEPSS 1.2%CVE-2022-22241HIGHJunos OS: Vulnerability in J-Web may allow deserialization without authenticationEPSS 1.2%CVE-2025-31233MEDIUMThe issue was addressed with improved input sanitization. This issue is fixed in iOS 18.5 and iPadOS 18.5, iPadOS 17.7.7, macOS Sequoia 15.5EPSS 1.2%CVE-2021-31372HIGHJunos OS: J-Web allows a locally authenticated attacker to escalate their privileges to root.EPSS 1.2%CVE-2026-33250HIGHCrash when receiving specially-crafted packetsEPSS 1.2%CVE-2016-7074MEDIUMAn issue has been found in PowerDNS before 3.4.11 and 4.0.2, and PowerDNS recursor before 4.0.4, allowing an attacker in position of man-in-EPSS 1.2%CVE-2022-4904HIGHA flaw was found in the c-ares package. The ares_set_sortlist is missing checks about the validity of the input string, which allows a possiEPSS 1.2%CVE-2024-45219HIGHApache CloudStack: Uploaded and registered templates and volumes can be used to abuse KVM-based infrastructureEPSS 1.2%