Weakness (CWE)
CWE-93: Improper Neutralization of CRLF Sequences
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.
How to prevent it (2 mitigations)
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Implementation
Avoid using CRLF as a special sequence.
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Implementation
Appropriately filter or quote CRLF sequences in user-controlled input.
Source: MITRE CWE-93
147 results · Clear filters · Feed
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Medium 5.0
In JetBrains Hub before 2026.2.52556 sMTP command injection via email verification was possible
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Medium 5.6
HTTP::Session versions before 0.54 for Perl allow memcached command injection via unfiltered session ids in HTTP::Session::Store::CHI
HTTP::Session versions before 0.54 for Perl allow memcached command injection via unfiltered session ids in HTTP::Session::Store::CHI. The session id from the client's cookie reaches the CHI cache unchanged. The sibling HTTP::Session::Store::Memcached rejects…
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Medium 5.9
OPNsense core through 26.7.8 NTP Configuration Injection via GPS and PPS Fudge Fields
OPNsense core through 26.7.8 contains a configuration injection vulnerability that allows authenticated users to append ntpd.conf directives by embedding newlines in the fudge and refid fields. Attackers holding the page-services-ntp-gps or PPS privilege can …
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Medium 6.8
OPNsense before 26.7.8 Wireless WPA Configuration Line Injection via Identity
OPNsense core before 26.7.8 contains a configuration line injection vulnerability that allows authenticated users with wireless-edit privilege to inject directives by embedding CR/LF characters in WPA fields. Attackers can place newlines in wpa.identity, wpa.…
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Medium 4.3
Zimbra Collaboration Suite Data Source Test SMTP Command Injection via Unsanitized Email Address
An SMTP command injection vulnerability in the data-source testing functionality of Zimbra Collaboration Suite (ZCS) allows an ordinary authenticated user with account options enabled to inject CR/LF into the emailAddress inserted into an SMTP envelope comman…
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Medium 6.5
ArmorX Global Technology｜ArmorX Spam - Command Injection
ArmorX Spam developed by ArmorX Global Technology has a Command Injection vulnerability. Authenticated remote attackers can inject crafted commands into a specific parameter, thereby uploading malicious code to the server.
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Medium 5.5
Netgate pfSense CE 2.7.1 through 2.9.0 CRLF Injection via services_unbound_advanced.php
Netgate pfSense CE from 2.7.1 through 2.9.0 contains a CRLF injection vulnerability in services_unbound_advanced.php that allows authenticated users with DNS Resolver: Advanced privilege to inject Unbound directives. Attackers can embed CR/LF characters in th…
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Medium 5.5
Netgate pfSense CE through 2.9.0 CRLF Injection via services_unbound_acls.php
Netgate pfSense CE through 2.9.0 contains a CRLF injection vulnerability in services_unbound_acls.php that allows authenticated users with the DNS Resolver: Access Lists privilege to inject Unbound configuration directives. Attackers can embed CR/LF character…
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Medium 6.6
Netgate pfSense CE through 2.9.0 php.ini Injection via Timezone Setting
Netgate pfSense CE through 2.9.0 contains a php.ini injection vulnerability that allows authenticated users with General Setup privileges to inject directives by submitting an unvalidated timezone value. Attackers can embed a quote and newline to add auto_pre…
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Medium 6.6
Netgate pfSense CE through 2.9.0 Command Injection via PPPoE Server Username
Netgate pfSense CE through 2.9.0 contains a newline injection vulnerability in services_pppoe_edit.php that allows privileged users to inject mpd.secret entries via unvalidated username POST fields. Attackers with the PPPoE Server Edit privilege can add a lin…
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Medium 4.0
FreeRDP 3.0.0 before 3.32.0 HTTP Header Injection via Proxy Routing Token
FreeRDP 3.0.0 before 3.32.0 allows HTTP header injection in its proxy because a lone LF in the target portion of a routing token (Cookie: msts=) is not rejected and is written by http_proxy_connect into the CONNECT request line and Host header. A remote unaut…
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Medium 6.9
CRLF header injection in vertx-mail-client allows manipulation of outgoing SMTP messages
In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the vertx-mail-client does not sanitize CR (\r) or LF (\n) characters in user-supplied email header names and values before writing them into the SMTP DATA sectio…
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Medium 5.8
OWASP Coraza WAF: Native audit-log format allows CRLF injection and log forgery via request body and header fields
OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.0.0 until 3.8.0, the Native audit-log formatter in internal/auditlog/formats.go writes attacker-influenced request and response fields without neutralizing carriage r…
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Medium 6.8
Brocade Fabric OS versions before 9.2.2d and 10.0.0 through 10.0.0a1 directly accepts Apache configuration file data du…
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Medium 6.9
An input validation and output encoding vulnerability exists in the web management interface of Brocade Fabric OS versi…
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Medium 6.3
Kiteworks Core Command Execution through Configuration Injection
In multi-node deployments, an attacker who had already obtained code execution on one appliance node could submit a value through an internal cluster interface that was written into monitoring configuration on another node without sufficient validation, poten…
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Medium 6.6
Kiteworks Core Server-Side Request Forgery through CRLF Injection
An authenticated administrator could cause the server to issue requests to, and interact with, internal network services that are not meant to be reachable through this interface. On its own this did not result in code execution.
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Medium 5.8
virtualenv writes prompt values into pyvenv.cfg without sanitizing line boundaries, allowing configuration injection
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.11, PyEnvCfg.write() writes prompt values verbatim to the line-oriented pyvenv.cfg format while PyEnvCfg._read_values() parses the file with str.splitlines() and accepts the…
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Medium 5.3
Livestatus injection via monitoring filter values
Improper neutralization of newlines in filter values in the monitoring host and service list APIs in Checkmk <2.5.0p14 allows an authenticated user to inject additional Livestatus query headers, bypassing object visibility restrictions in count queries to inf…
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Medium 4.3
ST Engineering iDirect iDX/Evo iDX HTTP Request authorize response splitting
A vulnerability was determined in ST Engineering iDirect iDX and Evo iDX. This vulnerability affects unknown code of the file /authorize of the component HTTP Request Handler. Executing a manipulation of the argument Success can lead to http response splittin…
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Medium 4.0
Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead de…
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Medium 5.4
Tornado before 6.4.1 CRLF Injection via CurlAsyncHTTPClient
Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or constru…
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Medium 6.5
Froxlor before 2.3.12 SSH Key Injection via authorized_keys
Froxlor before 2.3.12 fails to properly validate multi-line SSH public keys in the SshKeys::add() endpoint, allowing customers to inject arbitrary lines into authorized_keys files. Attackers can inject malicious SSH key entries with option directives to gain …
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Medium 4.8
MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To
The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the em…
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Medium 4.8
JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action
The JetFormBuilder WordPress plugin before 3.6.5.2 does not validate or strip line breaks from address values it sources from submitted form fields before adding them to the headers of the e-mails it sends, allowing unauthenticated users to inject arbitrary e…
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Medium 4.2
Authenticated KMS request forgery via CRLF injection in GCP key identifier strings
An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and defeating client-side…
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Medium 5.3
HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers
HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, conten…
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Medium 4.9
Nodemailer before 8.0.5 SMTP Command Injection via CRLF
Nodemailer versions before 8.0.5 contain an SMTP command injection vulnerability in the transport name option used in EHLO/HELO commands. The name parameter is concatenated directly into SMTP commands without sanitizing carriage return and line feed character…
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Medium 5.4
Nodemailer CRLF Injection via List-* Header Comments
Nodemailer before 8.0.9 fails to sanitize carriage return and line feed characters in list comment fields, allowing attackers to inject arbitrary message headers. An attacker with control over list.*.comment parameters can inject CRLF sequences to create addi…
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Medium 4.8
Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator…
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Medium 5.3
cpp-httplib: CRLF injection via unvalidated HTTP trailer headers in chunked response writing
cpp-httplib is a C++ header-only HTTP/HTTPS library. In version 0.49.0, the chunked-response trailer output path writes trailer header names and values directly to the socket without validating them, allowing CRLF sequences in a trailer field to inject additi…
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Medium 5.3
Reverse::Proxy versions before 0.04 for Perl allow HTTP request smuggling via a percent-decoded PATH_INFO written unencoded to the upstream request line
Reverse::Proxy versions before 0.04 for Perl allow HTTP request smuggling via a percent-decoded PATH_INFO written unencoded to the upstream request line. PSGI hands PATH_INFO to an application percent-decoded, so a %XX sequence in the client URL has become a …
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Medium 5.8
@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name
@fastify/busboy is a multipart form-data parser for Node.js. Its multipart part-header parser splits header lines only on the two-byte carriage-return line-feed sequence, so a lone carriage return or line feed embedded in a part header is not treated as a lin…
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Medium 6.9
HTTP/2 header field values containing CR, LF or NUL are passed to the application unvalidated in Bandit
Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in mtrudel bandit allows an unauthenticated remote attacker to smuggle CR, LF, or NUL characters into application-visible request headers via HTTP/2. Bandit.HTTP2.Stream.read_headers/1…
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Medium 6.9
aiosmtplib: SMTP command injection via CR/LF in sender/recipient address
aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.1, SMTP.mail(), SMTP.rcpt(), SMTP.vrfy(), and SMTP.expn() send caller-supplied addresses without rejecting embedded CR or LF bytes. Data after the line break is framed as additional …
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Medium 6.9
Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2
Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.
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Medium 4.8
Joomla! Core - [20260801] - Response header injection in download views in Joomla 3.0.0-5.4.7, 6.0.0-6.1.2
Joomla! Core - [20260801] - Response header injection in download views in Joomla 3.0.0-5.4.7, 6.0.0-6.1.2 - Lack of output processing allowed a header injection in the multiple download views, leading to reflected file download / content-type confusion.
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Medium 5.3
MyBB: Email User CRLF injection
MyBB is free and open source forum software. Prior to 1.8.40, the Email User controller does not sanitize sender names correctly, resulting in mail header injection. member.php?action=do_emailuser accepts the fromname HTTP parameter for guests or the stored u…
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Medium 6.5
rsync < 3.5.0 Newline Injection via name-converter uid/gid mapping
rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious …
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Medium 6.9
Local privilege escalation via improper input sanitization in execl() call
In Teltonika Networks RUTOS devices running versions 7.07.1 through 7.24.1 and TSWOS devices running versions 1.03 through 1.10, a vulnerability exists whereby a lower privileged user can escalate privileges to administrative level due to unsafe calls to an e…