Weaknesses of type CWE-20

5,887 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-2018-7935MEDIUM There is a vulnerability in 21.328.01.00.00 version of the E5573Cs-322. Remote attackers could exploit this vulnerability to make the netwoEPSS 1.1%CVE-2026-118484MEDIUMCAI Content Credentials | Improper Input Validation (CWE-20)EPSS 1.1%CVE-2020-3217HIGHCisco IOS, IOS XE, IOS XR, and NX-OS Software One Platform Kit Remote Code Execution VulnerabilityEPSS 1.1%CVE-2023-45178MEDIUMIBM Db2 denial of serviceEPSS 1.1%CVE-2023-46167MEDIUMIBM Db2 denial of serviceEPSS 1.1%CVE-2026-105719MEDIUMMicrosoft SharePoint Server Information Disclosure VulnerabilityEPSS 1.1%CVE-2026-20224HIGHCisco Catalyst SD-WAN Manager XML External Entity Injection VulnerabilityEPSS 1.1%CVE-2025-43430MEDIUMThis issue was addressed through improved state management. This issue is fixed in Safari 26.1, iOS 26.1 and iPadOS 26.1, macOS Tahoe 26.1, EPSS 1.1%CVE-2023-47003CRITICALAn issue in RedisGraph v.2.12.10 allows an attacker to execute arbitrary code and cause a denial of service via a crafted string in DataBlocEPSS 1.1%CVE-2020-3134MEDIUMCisco Email Security Appliance Zip Decompression Engine Denial of Service VulnerabilityEPSS 1.1%CVE-2023-31149CRITICALImproper Input Validation in Web InterfaceEPSS 1.1%CVE-2023-31148CRITICALImproper Input Validation in Web InterfaceEPSS 1.1%CVE-2024-35296HIGHApache Traffic Server: Invalid Accept-Encoding can force forwarding requestsEPSS 1.1%CVE-2025-64666HIGHMicrosoft Exchange Server Elevation of Privilege VulnerabilityEPSS 1.1%CVE-2023-48310CRITICALAbility to DoS the testing infrastructure by overwriting filesEPSS 1.1%CVE-2023-34457MEDIUMMechanicalSoup vulnerable to malicious web server reading arbitrary files on client using file input inside HTML formEPSS 1.1%CVE-2021-21431HIGHImproper Input Validation in sopel-plugins.channelmgntEPSS 1.1%CVE-2024-40520HIGHSeaCMS 12.9 has a remote code execution vulnerability. The vulnerability is caused by admin_config_mark.php directly splicing and writing thEPSS 1.1%CVE-2021-20330MEDIUMSpecific replication command with malformed oplog entries can crash secondariesEPSS 1.1%CVE-2020-3542MEDIUMCisco Webex Training Unauthorized Meeting Join VulnerabilityEPSS 1.1%