The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
View on MITREAvoid using CRLF as a special sequence.
Appropriately filter or quote CRLF sequences in user-controlled input.
No detection method information available for this CWE.
The following code segment reads the name of the author of a weblog entry, author, from an HTTP request and sets it in a cookie header of an HTTP response.
Assuming a string consisting of standard alpha-numeric characters, such as "Jane Smith", is submitted in the request the HTTP response including this cookie might take the following form:
If user input data that eventually makes it to a log message isn't checked for CRLF characters, it may be possible for an attacker to forge entries in a log file.
CRLF injection enables spam proxy (add mail headers) using email address or name.
View DetailsCRLF injection in API function arguments modify headers for outgoing requests.
View DetailsChain: Application accepts CRLF in an object ID, allowing HTTP response splitting.
View DetailsNo relationship information available for this CWE.
CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') is a Common Weakness Enumeration (CWE) entry maintained by MITRE. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
If exploited, CWE-93 (Improper Neutralization of CRLF Sequences ('CRLF Injection')) it can compromise Integrity, leading to outcomes such as Modify Application Data.
Recommended mitigations for CWE-93 include: Avoid using CRLF as a special sequence. Appropriately filter or quote CRLF sequences in user-controlled input.
CWE-93 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-93, including CVE-2002-1771, CVE-2002-1783, CVE-2004-1513, CVE-2006-4624 and CVE-2005-1951. 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-93 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.