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CWE-20: Improper Input Validation, page 171

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The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

What the weakness is: CWE-20 at MITRE. OWASP Top 10: A05:2025 Injection

Related attack patterns (CAPEC): 51
  • CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters Likelihood: Medium · Severity: Medium
  • CAPEC-7 Blind SQL Injection Likelihood: High · Severity: High
  • CAPEC-8 Buffer Overflow in an API Call Likelihood: High · Severity: High
  • CAPEC-9 Buffer Overflow in Local Command-Line Utilities Likelihood: High · Severity: High
  • CAPEC-10 Buffer Overflow via Environment Variables Likelihood: High · Severity: High
  • CAPEC-13 Subverting Environment Variable Values Likelihood: High · Severity: Very High
  • CAPEC-14 Client-side Injection-induced Buffer Overflow Likelihood: Medium · Severity: High
  • CAPEC-22 Exploiting Trust in Client Likelihood: High · Severity: High
  • CAPEC-23 File Content Injection Likelihood: High · Severity: Very High
  • CAPEC-24 Filter Failure through Buffer Overflow Likelihood: High · Severity: High
  • CAPEC-28 Fuzzing Likelihood: High · Severity: Medium
  • CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies Likelihood: High · Severity: High
  • CAPEC-42 MIME Conversion Likelihood: High · Severity: High
  • CAPEC-43 Exploiting Multiple Input Interpretation Layers Likelihood: Medium · Severity: High
  • CAPEC-45 Buffer Overflow via Symbolic Links Likelihood: High · Severity: High
  • CAPEC-46 Overflow Variables and Tags Likelihood: High · Severity: High
  • CAPEC-47 Buffer Overflow via Parameter Expansion Likelihood: Medium · Severity: High
  • CAPEC-52 Embedding NULL Bytes Likelihood: High · Severity: High
  • CAPEC-53 Postfix, Null Terminate, and Backslash Likelihood: High · Severity: High
  • CAPEC-63 Cross-Site Scripting (XSS) Likelihood: High · Severity: Very High
  • CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic Likelihood: High · Severity: High
  • CAPEC-67 String Format Overflow in syslog() Likelihood: High · Severity: Very High
  • CAPEC-71 Using Unicode Encoding to Bypass Validation Logic Likelihood: Medium · Severity: High
  • CAPEC-72 URL Encoding Likelihood: High · Severity: High
  • CAPEC-73 User-Controlled Filename Likelihood: High · Severity: High
  • CAPEC-78 Using Escaped Slashes in Alternate Encoding Likelihood: High · Severity: High
  • CAPEC-79 Using Slashes in Alternate Encoding Likelihood: High · Severity: High
  • CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic Likelihood: High · Severity: High
  • CAPEC-81 Web Server Logs Tampering Likelihood: Medium · Severity: High
  • CAPEC-83 XPath Injection Likelihood: High · Severity: High
  • CAPEC-85 AJAX Footprinting Likelihood: High · Severity: Low
  • CAPEC-88 OS Command Injection Likelihood: High · Severity: High
  • CAPEC-101 Server Side Include (SSI) Injection Likelihood: High · Severity: High
  • CAPEC-104 Cross Zone Scripting Likelihood: Medium · Severity: High
  • CAPEC-108 Command Line Execution through SQL Injection Likelihood: Low · Severity: Very High
  • CAPEC-109 Object Relational Mapping Injection Likelihood: Low · Severity: High
  • CAPEC-110 SQL Injection through SOAP Parameter Tampering Likelihood: High · Severity: Very High
  • CAPEC-120 Double Encoding Likelihood: Low · Severity: Medium
  • CAPEC-135 Format String Injection Likelihood: High · Severity: High
  • CAPEC-136 LDAP Injection Likelihood: High · Severity: High
  • CAPEC-153 Input Data Manipulation Severity: Medium
  • CAPEC-182 Flash Injection Likelihood: High · Severity: Medium
  • CAPEC-209 XSS Using MIME Type Mismatch Severity: Medium
  • CAPEC-230 Serialized Data with Nested Payloads Likelihood: Medium · Severity: High
  • CAPEC-231 Oversized Serialized Data Payloads Likelihood: Medium · Severity: High
  • CAPEC-250 XML Injection Likelihood: High
  • CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data Severity: Medium
  • CAPEC-267 Leverage Alternate Encoding Likelihood: High · Severity: High
  • CAPEC-473 Signature Spoof
  • CAPEC-588 DOM-Based XSS Likelihood: High · Severity: Very High
  • CAPEC-664 Server Side Request Forgery Likelihood: High · Severity: High

The attack patterns MITRE's CAPEC relates to CWE-20, as MITRE names them. Credits.

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