CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Description
The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers.
Hierarchy (View 1000)
Related attack patterns (CAPEC)
CAPEC-105 · CAPEC-31 · CAPEC-34 · CAPEC-85
CVEs mapped to this weakness (119)
page 4 of 6| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2020-5249 | Med | 0.35 | 6.5 | 0.02 | Mar 2, 2020 | In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body.… | ||
| CVE-2020-5247 | Med | 0.35 | 6.5 | 0.03 | Feb 28, 2020 | In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. `CR`, `LF` or`/r`, `/n`) to end the header and inject malicious content, such as additional headers or an… | ||
| CVE-2017-17742 | Med | 0.35 | 5.3 | 0.06 | Apr 3, 2018 | Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1 allows an HTTP Response Splitting attack. An attacker can inject a crafted key and value into an HTTP response for the HTTP server of WEBrick. | ||
| CVE-2017-12309 | Med | 0.35 | 5.3 | 0.02 | Nov 16, 2017 | A vulnerability in the Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to conduct a HTTP response splitting attack. The vulnerability is due to the failure of the application or its environment to properly sanitize input values. An attacker… | ||
| CVE-2026-43966 | Med | 0.34 | — | 0.00 | Jun 8, 2026 | Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in ninenines cowlib allows HTTP response splitting via non-VCHAR bytes in structured-fields string values. cow_http_struct_hd:escape_string/2 in cowlib only escapes \ and… | ||
| CVE-2024-24795 | Med | 0.34 | 6.3 | 0.03 | Apr 4, 2024 | HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack. Users are recommended to upgrade to version 2.4.59, which fixes this issue. | ||
| CVE-2023-48256 | Med | 0.34 | 5.3 | 0.00 | Jan 10, 2024 | The vulnerability allows a remote attacker to inject arbitrary HTTP response headers or manipulate HTTP response bodies inside a victim’s session via a crafted URL or HTTP request. | ||
| CVE-2023-26147 | Med | 0.34 | 5.3 | 0.00 | Sep 29, 2023 | All versions of the package ithewei/libhv are vulnerable to HTTP Response Splitting when untrusted user input is used to build headers values. An attacker can add the \r\n (carriage return line feeds) characters to end the HTTP response headers and inject malicious content, like… | ||
| CVE-2019-25101 | Med | 0.34 | 6.3 | 0.01 | Feb 4, 2023 | A vulnerability classified as critical has been found in OnShift TurboGears 1.0.11.10. This affects an unknown part of the file turbogears/controllers.py of the component HTTP Header Handler. The manipulation leads to http response splitting. It is possible to initiate the… | ||
| CVE-2017-7528 | Med | 0.34 | 5.2 | 0.01 | Aug 22, 2018 | Ansible Tower as shipped with Red Hat CloudForms Management Engine 5 is vulnerable to CRLF Injection. It was found that X-Forwarded-For header allows internal servers to deploy other systems (using callback). | ||
| CVE-2024-45302 | Med | 0.33 | 6.1 | 0.00 | Aug 29, 2024 | RestSharp is a Simple REST and HTTP API Client for .NET. The second argument to `RestRequest.AddHeader` (the header value) is vulnerable to CRLF injection. The same applies to `RestRequest.AddOrUpdateHeader` and `RestClient.AddDefaultHeader`. The way HTTP headers are added to a… | ||
| CVE-2021-40336 | Med | 0.33 | 5.0 | 0.00 | Jul 25, 2022 | A vulnerability exists in the http web interface where the web interface does not validate data in an HTTP header. This causes a possible HTTP response splitting, which if exploited could lead an attacker to channel down harmful code into the user’s web browser, such as to… | ||
| CVE-2016-4993 | Med | 0.33 | 6.1 | 0.03 | Sep 26, 2016 | CRLF injection vulnerability in the Undertow web server in WildFly 10.0.0, as used in Red Hat JBoss Enterprise Application Platform (EAP) 7.x before 7.0.2, allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified… | ||
| CVE-2016-0789 | Med | 0.33 | 6.1 | 0.02 | Apr 7, 2016 | CRLF injection vulnerability in the CLI command documentation in Jenkins before 1.650 and LTS before 1.642.2 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors. | ||
| CVE-2025-0588 | Med | 0.32 | 4.9 | 0.00 | Feb 11, 2025 | In affected versions of Octopus Server it was possible for a user with sufficient access to set custom headers in all server responses. By submitting a specifically crafted referrer header the user could ensure that all subsequent server responses would return 500 errors… | ||
| CVE-2026-44214 | Med | 0.31 | 5.8 | 0.00 | May 26, 2026 | eventsource-encoder encodes events as well-formed EventSource/Server Sent Event (SSE) messages. Prior to 1.0.2, eventsource-encoder does not sanitize the event or id fields of an EventSourceMessage before serializing them. An attacker who controls either field can inject… | ||
| CVE-2026-34767 | Med | 0.31 | 5.9 | 0.00 | Apr 4, 2026 | Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.3, 40.8.3, and 41.0.3, apps that register custom protocol handlers via protocol.handle() / protocol.registerSchemesAsPrivileged() or modify… | ||
| CVE-2022-20772 | Med | 0.31 | 4.7 | 0.01 | Nov 4, 2022 | A vulnerability in Cisco Email Security Appliance (ESA) and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to conduct an HTTP response splitting attack. This vulnerability is due to the failure of the application or its environment to… | ||
| CVE-2022-37953 | Med | 0.31 | 4.7 | 0.00 | Aug 25, 2022 | An HTTP response splitting vulnerability exists in the AM Gateway Challenge-Response dialog of WorkstationST (<v07.09.15) and could allow an attacker to compromise a victim's browser/session. WorkstationST is only deployed in specific, controlled environments rendering attack… | ||
| CVE-2020-3117 | Med | 0.31 | 4.7 | 0.01 | Sep 23, 2020 | A vulnerability in the API Framework of Cisco AsyncOS for Cisco Web Security Appliance (WSA) and Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to inject crafted HTTP headers in the web server's response. The vulnerability is… |
- risk 0.35cvss 6.5epss 0.02
In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body.…
- risk 0.35cvss 6.5epss 0.03
In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. `CR`, `LF` or`/r`, `/n`) to end the header and inject malicious content, such as additional headers or an…
- risk 0.35cvss 5.3epss 0.06
Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1 allows an HTTP Response Splitting attack. An attacker can inject a crafted key and value into an HTTP response for the HTTP server of WEBrick.
- risk 0.35cvss 5.3epss 0.02
A vulnerability in the Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to conduct a HTTP response splitting attack. The vulnerability is due to the failure of the application or its environment to properly sanitize input values. An attacker…
- risk 0.34cvss —epss 0.00
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in ninenines cowlib allows HTTP response splitting via non-VCHAR bytes in structured-fields string values. cow_http_struct_hd:escape_string/2 in cowlib only escapes \ and…
- risk 0.34cvss 6.3epss 0.03
HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack. Users are recommended to upgrade to version 2.4.59, which fixes this issue.
- risk 0.34cvss 5.3epss 0.00
The vulnerability allows a remote attacker to inject arbitrary HTTP response headers or manipulate HTTP response bodies inside a victim’s session via a crafted URL or HTTP request.
- risk 0.34cvss 5.3epss 0.00
All versions of the package ithewei/libhv are vulnerable to HTTP Response Splitting when untrusted user input is used to build headers values. An attacker can add the \r\n (carriage return line feeds) characters to end the HTTP response headers and inject malicious content, like…
- risk 0.34cvss 6.3epss 0.01
A vulnerability classified as critical has been found in OnShift TurboGears 1.0.11.10. This affects an unknown part of the file turbogears/controllers.py of the component HTTP Header Handler. The manipulation leads to http response splitting. It is possible to initiate the…
- risk 0.34cvss 5.2epss 0.01
Ansible Tower as shipped with Red Hat CloudForms Management Engine 5 is vulnerable to CRLF Injection. It was found that X-Forwarded-For header allows internal servers to deploy other systems (using callback).
- risk 0.33cvss 6.1epss 0.00
RestSharp is a Simple REST and HTTP API Client for .NET. The second argument to `RestRequest.AddHeader` (the header value) is vulnerable to CRLF injection. The same applies to `RestRequest.AddOrUpdateHeader` and `RestClient.AddDefaultHeader`. The way HTTP headers are added to a…
- risk 0.33cvss 5.0epss 0.00
A vulnerability exists in the http web interface where the web interface does not validate data in an HTTP header. This causes a possible HTTP response splitting, which if exploited could lead an attacker to channel down harmful code into the user’s web browser, such as to…
- risk 0.33cvss 6.1epss 0.03
CRLF injection vulnerability in the Undertow web server in WildFly 10.0.0, as used in Red Hat JBoss Enterprise Application Platform (EAP) 7.x before 7.0.2, allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified…
- risk 0.33cvss 6.1epss 0.02
CRLF injection vulnerability in the CLI command documentation in Jenkins before 1.650 and LTS before 1.642.2 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.
- risk 0.32cvss 4.9epss 0.00
In affected versions of Octopus Server it was possible for a user with sufficient access to set custom headers in all server responses. By submitting a specifically crafted referrer header the user could ensure that all subsequent server responses would return 500 errors…
- risk 0.31cvss 5.8epss 0.00
eventsource-encoder encodes events as well-formed EventSource/Server Sent Event (SSE) messages. Prior to 1.0.2, eventsource-encoder does not sanitize the event or id fields of an EventSourceMessage before serializing them. An attacker who controls either field can inject…
- risk 0.31cvss 5.9epss 0.00
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.3, 40.8.3, and 41.0.3, apps that register custom protocol handlers via protocol.handle() / protocol.registerSchemesAsPrivileged() or modify…
- risk 0.31cvss 4.7epss 0.01
A vulnerability in Cisco Email Security Appliance (ESA) and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to conduct an HTTP response splitting attack. This vulnerability is due to the failure of the application or its environment to…
- risk 0.31cvss 4.7epss 0.00
An HTTP response splitting vulnerability exists in the AM Gateway Challenge-Response dialog of WorkstationST (<v07.09.15) and could allow an attacker to compromise a victim's browser/session. WorkstationST is only deployed in specific, controlled environments rendering attack…
- risk 0.31cvss 4.7epss 0.01
A vulnerability in the API Framework of Cisco AsyncOS for Cisco Web Security Appliance (WSA) and Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to inject crafted HTTP headers in the web server's response. The vulnerability is…