Common Weakness Enumeration
CWE-93
AllowedImproper Neutralization of CRLF Sequences ('CRLF Injection')
Abstraction: Base · Status: Draft
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.
385 vulnerabilities reference this CWE, most recent first.
CVE-2022-50682 (GCVE-0-2022-50682)
Vulnerability from cvelistv5 – Published: 2025-12-18 19:53 – Updated: 2025-12-18 21:47
VLAI
EPSS
VEX
Title
Kentico Xperience <= 13.0.79 Routing Engine CRLF Injection
Summary
A CRLF injection vulnerability in Kentico Xperience allows attackers to manipulate URL query string redirects via improper encoding in the routing engine. This could enable header injection and potentially facilitate further web application attacks.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-18 21:07 UTC
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://devnet.kentico.com/download/hotfixes | vendor-advisorypatch |
| https://www.vulncheck.com/advisories/kentico-xper… | third-party-advisory |
Impacted products
Date Public
2022-09-02 00:00
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CVE-2022-35948 (GCVE-0-2022-35948)
Vulnerability from cvelistv5 – Published: 2022-08-13 00:00 – Updated: 2025-04-22 17:42
VLAI
EPSS
VEX
Title
CRLF Injection in Nodejs ‘undici’ via Content-Type
Summary
undici is an HTTP/1.1 client, written from scratch for Node.js.`=< undici@5.8.0` users are vulnerable to _CRLF Injection_ on headers when using unsanitized input as request headers, more specifically, inside the `content-type` header. Example: ``` import { request } from 'undici' const unsanitizedContentTypeInput = 'application/json\r\n\r\nGET /foo2 HTTP/1.1' await request('http://localhost:3000, { method: 'GET', headers: { 'content-type': unsanitizedContentTypeInput }, }) ``` The above snippet will perform two requests in a single `request` API call: 1) `http://localhost:3000/` 2) `http://localhost:3000/foo2` This issue was patched in Undici v5.8.1. Sanitize input when sending content-type headers using user input as a workaround.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-22 15:39 UTC
CWE
Assigner
References
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CVE-2022-31150 (GCVE-0-2022-31150)
Vulnerability from cvelistv5 – Published: 2022-07-19 20:40 – Updated: 2025-04-22 17:48
VLAI
EPSS
VEX
Title
CRLF injection in request headers
Summary
undici is an HTTP/1.1 client, written from scratch for Node.js. It is possible to inject CRLF sequences into request headers in undici in versions less than 5.7.1. A fix was released in version 5.8.0. Sanitizing all HTTP headers from untrusted sources to eliminate `\r\n` is a workaround for this issue.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-22 15:40 UTC
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/nodejs/undici/security/advisor… | x_refsource_CONFIRM |
| https://hackerone.com/reports/409943 | x_refsource_MISC |
| https://github.com/nodejs/undici/releases/tag/v5.8.0 | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022091… | x_refsource_CONFIRM |
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CVE-2022-31014 (GCVE-0-2022-31014)
Vulnerability from cvelistv5 – Published: 2022-07-05 17:15 – Updated: 2025-04-22 17:52
VLAI
EPSS
VEX
Title
SMTP Command Injection in iCalendar Attachments to emails via newlines in Nextcloud Server
Summary
Nextcloud server is an open source personal cloud server. Affected versions were found to be vulnerable to SMTP command injection. The impact varies based on which commands are supported by the backend SMTP server. However, the main risk here is that the attacker can then hijack an already-authenticated SMTP session and run arbitrary SMTP commands as the email user, such as sending emails to other users, changing the FROM user, and so on. As before, this depends on the configuration of the server itself, but newlines should be sanitized to mitigate such arbitrary SMTP command injection. It is recommended that the Nextcloud Server is upgraded to 22.2.8 , 23.0.5 or 24.0.1. There are no known workarounds for this issue.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-22 15:45 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/nextcloud/security-advisories/… | x_refsource_CONFIRM |
| https://github.com/nextcloud/server/pull/32428 | x_refsource_MISC |
| https://hackerone.com/reports/1516377 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| nextcloud | security-advisories |
Affected:
< 22.2.8
Affected: >= 23.0.0, < 23.0.5 Affected: >= 24.0.0, < 24.0.1 |
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CVE-2022-0666 (GCVE-0-2022-0666)
Vulnerability from cvelistv5 – Published: 2022-02-18 14:55 – Updated: 2024-08-02 23:32
VLAI
EPSS
VEX
Title
CRLF Injection leads to Stack Trace Exposure due to lack of filtering at https://demo.microweber.org/ in microweber/microweber
Summary
CRLF Injection leads to Stack Trace Exposure due to lack of filtering at https://demo.microweber.org/ in Packagist microweber/microweber prior to 1.2.11.
Severity
7.6 (High)
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences
Assigner
References
2 references
| URL | Tags |
|---|---|
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| https://github.com/microweber/microweber/commit/f… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| microweber | microweber/microweber |
Affected:
unspecified , < 1.2.11
(custom)
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CVE-2021-39172 (GCVE-0-2021-39172)
Vulnerability from cvelistv5 – Published: 2021-08-27 22:50 – Updated: 2024-08-04 01:58
VLAI
EPSS
VEX
Title
New line injection during configuration edition
Summary
Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving `UpdateConfigCommandHandler` and preventing the use of new lines characters in new configuration values. As a workaround, only allow trusted source IP addresses to access to the administration dashboard.
Severity
8.8 (High)
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/fiveai/Cachet/security/advisor… | x_refsource_CONFIRM |
| https://github.com/fiveai/Cachet/releases/tag/v2.5.1 | x_refsource_MISC |
| https://blog.sonarsource.com/cachet-code-executio… | x_refsource_MISC |
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CVE-2021-31164 (GCVE-0-2021-31164)
Vulnerability from cvelistv5 – Published: 2021-05-04 06:55 – Updated: 2024-08-03 22:55
VLAI
EPSS
VEX
Title
Apache Unomi log injection
Summary
Apache Unomi prior to version 1.5.5 allows CRLF log injection because of the lack of escaping in the log statements.
Severity
No CVSS data available.
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| http://unomi.apache.org/security/cve-2021-31164 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Unomi |
Affected:
Apache Unomi , < 1.5.5
(custom)
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CVE-2021-4097 (GCVE-0-2021-4097)
Vulnerability from cvelistv5 – Published: 2021-12-11 23:30 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Title
CRLF Injection in phpservermon/phpservermon
Summary
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
Severity
6.3 (Medium)
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences
Assigner
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2 references
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|---|---|
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| https://github.com/phpservermon/phpservermon/comm… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| phpservermon | phpservermon/phpservermon |
Affected:
unspecified , < 3.6.0
(custom)
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CVE-2020-15111 (GCVE-0-2020-15111)
Vulnerability from cvelistv5 – Published: 2020-07-20 17:40 – Updated: 2024-08-04 13:08
VLAI
EPSS
VEX
Title
CRLF vulnerability in Fiber
Summary
In Fiber before version 1.12.6, the filename that is given in c.Attachment() (https://docs.gofiber.io/ctx#attachment) is not escaped, and therefore vulnerable for a CRLF injection attack. I.e. an attacker could upload a custom filename and then give the link to the victim. With this filename, the attacker can change the name of the downloaded file, redirect to another site, change the authorization header, etc. A possible workaround is to serialize the input before passing it to ctx.Attachment().
Severity
4.2 (Medium)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/gofiber/fiber/security/advisor… | x_refsource_CONFIRM |
| https://github.com/gofiber/fiber/pull/579/commits… | x_refsource_MISC |
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CVE-2020-11078 (GCVE-0-2020-11078)
Vulnerability from cvelistv5 – Published: 2020-05-20 16:00 – Updated: 2024-08-04 11:21
VLAI
EPSS
VEX
Title
CRLF injection in httplib2
Summary
In httplib2 before version 0.18.0, an attacker controlling unescaped part of uri for `httplib2.Http.request()` could change request headers and body, send additional hidden requests to same server. This vulnerability impacts software that uses httplib2 with uri constructed by string concatenation, as opposed to proper urllib building with escaping. This has been fixed in 0.18.0.
Severity
6.8 (Medium)
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
11 references
| URL | Tags |
|---|---|
| https://github.com/httplib2/httplib2/security/adv… | x_refsource_CONFIRM |
| https://github.com/httplib2/httplib2/commit/a1457… | x_refsource_MISC |
| https://lists.apache.org/thread.html/rc9eff957294… | mailing-listx_refsource_MLIST |
| https://lists.debian.org/debian-lts-announce/2020… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r23711190c2e… | mailing-listx_refsource_MLIST |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
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| https://lists.apache.org/thread.html/rad8872fc99f… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r7f364000066… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r4d35dac106f… | mailing-listx_refsource_MLIST |
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Mitigation
Implementation
Avoid using CRLF as a special sequence.
Mitigation
Implementation
Appropriately filter or quote CRLF sequences in user-controlled input.
CAPEC-15: Command Delimiters
An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or denylist input validation, as opposed to allowlist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or denylist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
CAPEC-81: Web Server Logs Tampering
Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.