The product does not properly handle when all or part of an input has been URL encoded.
View on MITRENo mitigation information available for this CWE.
No detection method information available for this CWE.
CWE-177: Improper Handling of URL Encoding (Hex Encoding) is a Common Weakness Enumeration (CWE) entry maintained by MITRE. The product does not properly handle when all or part of an input has been URL encoded.
If exploited, CWE-177 (Improper Handling of URL Encoding (Hex Encoding)) it can compromise Integrity, leading to outcomes such as Unexpected State.
CWE-177 commonly affects Not Language-Specific. Note that weaknesses are often language-agnostic patterns, so secure coding practices apply broadly.
MITRE documents real CVEs mapped to CWE-177, including CVE-2000-0900, CVE-2005-2256, CVE-2004-2121, CVE-2004-0280 and CVE-2003-0424. You can look up the full details of each CVE, including CVSS scores and remediation guidance, on our CVE Lookup tool.
A CWE (Common Weakness Enumeration) like CWE-177 describes a category of software weakness — the underlying flaw type. A CVE (Common Vulnerabilities and Exposures) identifies a specific, real-world vulnerability in a particular product. In short, a CWE is the kind of mistake, and a CVE is an instance of that mistake being found in software.