cve.bz

CWE-20: Improper Input Validation, page 151

Filter

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.

Ask an AI about CWE-20

ChatGPTClaudeGoogle AI Mode

Show the promptExplain CWE-20: Improper Input Validation and how to prevent and detect it in code. Use https://cwe.mitre.org/data/definitions/20.html and https://cve.bz/cve/cwe/20?via=ask-ai-copy for recent CVEs with this weakness. Cite the sources.

Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this weakness's id and public links.

  1. 6.5CVE-2018-11799EPSS 1.5%

    Vulnerability allows a user of Apache Oozie 3.1.3-incubating to 5.0.0 to impersonate other users. The malicious user can construct an XML that results workflows running in other user's name.

  2. 7.3CVE-2018-18999EPSS 2.3%

    WebAccess/SCADA, WebAccess/SCADA Version 8.3.2 installed on Windows 2008 R2 SP1. Lack of proper validation of user supplied input may allow an attacker to cause the overflow of a buffer on the stack.

  3. 7.5CVE-2018-17194EPSS 3.0%

    When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other…

  4. 5.5CVE-2018-19522EPSS 0.4%

    DriverAgent 2.2015.7.14, which includes DrvAgent64.sys 1.0.0.1, allows a user to send an IOCTL (0x800020F4) with a buffer containing user defined content. The driver's subroutine will execute a wrmsr instruction with the user's buffer for …

  5. 6.5CVE-2018-20189EPSS 2.3%

    In GraphicsMagick 1.3.31, the ReadDIBImage function of coders/dib.c has a vulnerability allowing a crash and denial of service via a dib file that is crafted to appear with direct pixel values and also colormapping (which is not available …

  6. 6.5CVE-2018-19936EPSS 1.1%

    PrinterOn Enterprise 4.1.4 allows Arbitrary File Deletion.

  7. 7.8CVE-2018-19295EPSS 0.5%

    Sylabs Singularity 2.4 to 2.6 allows local users to conduct Improper Input Validation attacks.

  8. 5.5CVE-2018-20168EPSS 0.3%

    Google gVisor before 2018-08-22 reuses a pagetable in a different level with the paging-structure cache intact, which allows attackers to cause a denial of service ("physical address not valid" panic) via a crafted application.

  9. 7.2CVE-2018-20159ExploitEPSS 9.9%

    i-doit open 1.11.2 allows Remote Code Execution because ZIP archives are mishandled. It has an upload feature that allows an authenticated user with the administrator role to upload arbitrary files to the main website directory. Exploitati…

  10. 7.2CVE-2018-20156EPSS 1.5%

    The WP Maintenance Mode plugin before 2.0.7 for WordPress allows remote authenticated "site administrator" users to execute arbitrary PHP code throughout a multisite network.

  11. 6.5CVE-2018-20152EPSS 3.6%

    In WordPress before 4.9.9 and 5.x before 5.0.1, authors could bypass intended restrictions on post types via crafted input.

  12. 6.5CVE-2018-1977EPSS 1.9%

    IBM DB2 for Linux, UNIX and Windows 11.1 (includes DB2 Connect Server) contains a denial of service vulnerability. A remote, authenticated DB2 user could exploit this vulnerability by issuing a specially-crafted SELECT statement with TRUNC…

  13. 7.5CVE-2018-16875EPSS 6.5%

    The crypto/x509 package of Go before 1.10.6 and 1.11.x before 1.11.3 does not limit the amount of work performed for each chain verification, which might allow attackers to craft pathological inputs leading to a CPU denial of service. Go T…

  14. 8.1CVE-2018-16874EPSS 5.0%

    In Go before 1.10.6 and 1.11.x before 1.11.3, the "go get" command is vulnerable to directory traversal when executed with the import path of a malicious Go package which contains curly braces (both '{' and '}' characters). Specifically, i…

  15. 8.1CVE-2018-16873EPSS 66%

    In Go before 1.10.6 and 1.11.x before 1.11.3, the "go get" command is vulnerable to remote code execution when executed with the -u flag and the import path of a malicious Go package, or a package that imports it directly or indirectly. Sp…

  16. 7.5CVE-2018-16556EPSS 1.5%

    A vulnerability has been identified in SIMATIC S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 DP V7 (All versions), SIMATIC…

  17. 8.8CVE-2018-13814EPSS 1.7%

    A vulnerability has been identified in SIMATIC HMI Comfort Panels 4" - 22" (All versions < V14), SIMATIC HMI Comfort Outdoor Panels 7" & 15" (All versions < V14), SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 and KTP900F (…

  18. 7.5CVE-2018-20127EPSS 1.4%

    An issue was discovered in zzzphp cms 1.5.8. del_file in /admin/save.php allows remote attackers to delete arbitrary files via a mixed-case extension and an extra '.' character, because (for example) "php" is blocked but path=F:/1.phP. suc…

  19. 6.1CVE-2018-1478EPSS 1.1%

    IBM BigFix Platform 9.2.0 through 9.2.14 and 9.5 through 9.5.9 could allow a remote attacker to hijack the clicking action of the victim. By persuading a victim to visit a malicious Web site, a remote attacker could exploit this vulnerabil…

  20. 8.8CVE-2018-8635EPSS 6.1%

    An elevation of privilege vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted authentication request to an affected SharePoint server, aka "Microsoft SharePoint Server Elevation of Privilege…

  21. 5.5CVE-2018-8612EPSS 1.4%

    A Denial Of Service vulnerability exists when Connected User Experiences and Telemetry Service fails to validate certain function values, aka "Connected User Experiences and Telemetry Service Denial of Service Vulnerability." This affects …

  22. 5.7CVE-2018-18358EPSS 0.4%

    Lack of special casing of localhost in WPAD files in Google Chrome prior to 71.0.3578.80 allowed an attacker on the local network segment to proxy resources on localhost via a crafted WPAD file.

  23. 8.8CVE-2018-18354EPSS 1.4%

    Insufficient validate of external protocols in Shell Integration in Google Chrome on Windows prior to 71.0.3578.80 allowed a remote attacker to launch external programs via a crafted HTML page.

  24. 6.5CVE-2018-18351EPSS 2.5%

    Lack of proper validation of ancestor frames site when sending lax cookies in Navigation in Google Chrome prior to 71.0.3578.80 allowed a remote attacker to bypass SameSite cookie policy via a crafted HTML page.

  25. 8.8CVE-2018-18347EPSS 1.4%

    Incorrect handling of failed navigations with invalid URLs in Navigation in Google Chrome prior to 71.0.3578.80 allowed a remote attacker to trick a user into executing javascript in an arbitrary origin via a crafted HTML page.

  26. 5.5CVE-2018-1652EPSS 0.4%

    IBM DataPower Gateway 7.1.0.0 through 7.1.0.19, 7.2.0.0 through 7.2.0.16, 7.5.0.0 through 7.5.0.10, 7.5.1.0 through 7.5.1.9, 7.5.2.0 through 7.5.2.9, and 7.6.0.0 through 7.6.0.2 and IBM MQ Appliance 8.0.0.0 through 8.0.0.8 and 9.0.1 throug…

  27. 7.5CVE-2018-20051EPSS 1.4%

    Mishandling of '>' on the Jooan JA-Q1H Wi-Fi camera with firmware 21.0.0.91 allows remote attackers to cause a denial of service (crash and reboot) via certain ONVIF methods such as CreateUsers, SetImagingSettings, GetStreamUri, and so on.

  28. 6.5CVE-2018-20001EPSS 1.0%

    In Libav 12.3, there is a floating point exception in the range_decode_culshift function (called from range_decode_bits) in libavcodec/apedec.c that will lead to remote denial of service via crafted input.

  29. 7.5CVE-2018-19980EPSS 1.2%

    Anker Nebula Capsule Pro NBUI_M1_V2.1.9 devices allow attackers to cause a denial of service (reboot of the underlying Android 7.1.2 operating system) via a crafted application that sends data to WifiService.

  30. 6.5CVE-2018-19967EPSS 0.5%

    An issue was discovered in Xen through 4.11.x on Intel x86 platforms allowing guest OS users to cause a denial of service (host OS hang) because Xen does not work around Intel's mishandling of certain HLE transactions associated with the K…

  31. 7.0CVE-2018-19960EPSS 0.3%

    The debug_mode function in web/web.py in OnionShare through 1.3.1, when --debug is enabled, uses the /tmp/onionshare_server.log pathname for logging, which might allow local users to overwrite files or obtain sensitive information by using…

  32. 8.1CVE-2018-16528EPSS 3.3%

    Amazon Web Services (AWS) FreeRTOS through 1.3.1 allows remote attackers to execute arbitrary code because of mbedTLS context object corruption in prvSetupConnection and GGD_SecureConnect_Connect in AWS TLS connectivity modules.

  33. 7.8CVE-2018-9547EPSS 0.2%

    In unflatten of GraphicBuffer.cpp, there is a possible bad fd close due to improper input validation. This could lead to local escalation of privilege in the system server with no additional execution privileges needed. User interaction is…

  34. 6.1CVE-2018-1504EPSS 1.1%

    IBM i2 Enterprise Insight Analysis 2.1.7 could allow a remote attacker to hijack the clicking action of the victim. By persuading a victim to visit a malicious Web site, a remote attacker could exploit this vulnerability to hijack the vict…

  35. 9.8CVE-2018-19864ExploitEPSS 25%

    NUUO NVRmini2 Network Video Recorder firmware through 3.9.1 allows remote attackers to execute arbitrary code or cause a denial of service (buffer overflow), resulting in ability to read camera feeds or reconfigure the device.

  36. 6.5CVE-2018-6115EPSS 1.0%

    Inappropriate setting of the SEE_MASK_FLAG_NO_UI flag in file downloads in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to potentially bypass OS malware checks via a crafted HTML page.

  37. 4.3CVE-2018-6102EPSS 1.2%

    Missing confusable characters in Internationalization in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to spoof the contents of the Omnibox (URL bar) via a crafted domain name.

  38. 7.5CVE-2018-6101EPSS 2.7%

    A lack of host validation in DevTools in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to execute arbitrary code via a crafted HTML page, if the user is running a remote DevTools debugging server.

  39. 6.5CVE-2018-6089EPSS 1.6%

    A lack of CORS checks, after a Service Worker redirected to a cross-origin PDF, in Service Worker in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to leak limited cross-origin data via a crafted HTML page.

  40. 8.8CVE-2018-6088EPSS 2.4%

    An iterator-invalidation bug in PDFium in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted PDF file.

  41. 7.5CVE-2018-19591EPSS 5.5%

    In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

  42. 6.5CVE-2018-19791EPSS 1.2%

    The server in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 does not correctly handle requests for byte sequences, allowing an attacker to amplify the response size by requesting the entire response body repeatedly, as demonstrated by an HTTP R…

  43. 8.8CVE-2018-19788EPSS 12%

    A flaw was found in PolicyKit (aka polkit) 0.115 that allows a user with a uid greater than INT_MAX to successfully execute any systemctl command.

  44. 9.8CVE-2018-15715EPSS 3.5%

    Zoom clients on Windows (before version 4.1.34814.1119), Mac OS (before version 4.1.34801.1116), and Linux (2.4.129780.0915 and below) are vulnerable to unauthorized message processing. A remote unauthenticated attacker can spoof UDP messa…

  45. 7.5CVE-2018-3948EPSS 23%

    An exploitable denial-of-service vulnerability exists in the URI-parsing functionality of the TP-Link TL-R600VPN HTTP server. A specially crafted URL can cause the server to stop responding to requests, resulting in downtime for the manage…

  46. 6.5CVE-2018-9072EPSS 0.9%

    In versions prior to 5.5, LXCI for VMware allows an authenticated user to download any system file due to insufficient input sanitization during file downloads.

  47. 5.5CVE-2018-19755EPSS 1.0%

    There is an illegal address access at asm/preproc.c (function: is_mmacro) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service (out-of-bounds array access) because a certain conversion can result in a negative integer.

  48. 7.5CVE-2018-19654EPSS 0.9%

    An issue was discovered in Sales & Company Management System (SCMS) through 2018-06-06. There is a discrepancy in username checking between a component that does string validation, and a component that is supposed to query a MySQL database…

  49. 4.3CVE-2018-12123EPSS 4.0%

    Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Hostname spoofing in URL parser for javascript protocol: If a Node.js application is using url.parse() to determine the URL hostname, that hostname can be spoofed b…

  50. 9.8CVE-2017-18318EPSS 1.3%

    Missing validation check on CRL issuer name in Snapdragon Automobile, Snapdragon Mobile in versions MSM8996AU, SD 410/12, SD 425, SD 430, SD 450, SD 625, SD 650/52, SD 810, SD 820, SD 820A.