HTTP Server
by Apache
Source repositories
CVEs (346)
| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2016-1546 | Med | 0.40 | 5.9 | 0.16 | Jul 6, 2016 | The Apache HTTP Server 2.4.17 and 2.4.18, when mod_http2 is enabled, does not limit the number of simultaneous stream workers for a single HTTP/2 connection, which allows remote attackers to cause a denial of service (stream-processing outage) via modified flow-control windows. | ||
| CVE-2023-45802 | Med | 0.39 | 5.9 | 0.03 | Oct 23, 2023 | When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy… | ||
| CVE-2022-37436 | Med | 0.39 | 5.3 | 0.61 | Jan 17, 2023 | Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client. | ||
| CVE-2021-30641 | Med | 0.39 | 5.3 | 0.53 | Jun 10, 2021 | Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF' | ||
| CVE-2019-17567 | Med | 0.39 | 5.3 | 0.60 | Jun 10, 2021 | Apache HTTP Server versions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an URL that is not necessarily Upgraded by the origin server was tunneling the whole connection regardless, thus allowing for subsequent requests on the same connection to pass through with no HTTP… | ||
| CVE-2020-1934 | Med | 0.39 | 5.3 | 0.52 | Apr 1, 2020 | In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a malicious FTP server. | ||
| CVE-2018-1302 | Med | 0.39 | 5.9 | 0.13 | Mar 26, 2018 | When an HTTP/2 stream was destroyed after being handled, the Apache HTTP Server prior to version 2.4.30 could have written a NULL pointer potentially to an already freed memory. The memory pools maintained by the server make this vulnerability hard to trigger in usual… | ||
| CVE-2020-13938 | Med | 0.37 | 5.5 | 0.12 | Jun 10, 2021 | Apache HTTP Server versions 2.4.0 to 2.4.46 Unprivileged local users can stop httpd on Windows | ||
| CVE-2019-0196 | Med | 0.36 | 5.3 | 0.20 | Jun 11, 2019 | A vulnerability was found in Apache HTTP Server 2.4.17 to 2.4.38. Using fuzzed network input, the http/2 request handling could be made to access freed memory in string comparison when determining the method of a request and thus process the request incorrectly. | ||
| CVE-2019-0220 | Med | 0.36 | 5.3 | 0.18 | Jun 11, 2019 | A vulnerability was found in Apache HTTP Server 2.4.0 to 2.4.38. When the path component of a request URL contains multiple consecutive slashes ('/'), directives such as LocationMatch and RewriteRule must account for duplicates in regular expressions while other aspects of the… | ||
| CVE-2018-17189 | Med | 0.36 | 5.3 | 0.20 | Jan 30, 2019 | In Apache HTTP server versions 2.4.37 and prior, by sending request bodies in a slow loris way to plain resources, the h2 stream for that request unnecessarily occupied a server thread cleaning up that incoming data. This affects only HTTP/2 (mod_http2) connections. | ||
| CVE-2026-43951 | Med | 0.35 | 6.5 | 0.01 | Jun 8, 2026 | Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response languages. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. | ||
| CVE-2026-33523 | Med | 0.35 | 6.5 | 0.00 | May 4, 2026 | HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers. This issue affects Apache HTTP Server: from through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue. | ||
| CVE-2025-65082 | Med | 0.35 | 6.5 | 0.01 | Dec 5, 2025 | Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache HTTP Server through environment variables set via the Apache configuration unexpectedly superseding variables calculated by the server for CGI programs. This issue affects Apache HTTP Server… | ||
| CVE-2024-40725 | Med | 0.35 | 5.3 | 0.04 | Jul 18, 2024 | A partial fix for CVE-2024-39884 in the core of Apache HTTP Server 2.4.61 ignores some use of the legacy content-type based configuration of handlers. "AddType" and similar configuration, under some circumstances where files are requested indirectly, result in source code… | ||
| CVE-2024-36387 | Med | 0.35 | 5.4 | 0.02 | Jul 1, 2024 | Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance. | ||
| CVE-2022-28614 | Med | 0.35 | 5.3 | 0.05 | Jun 9, 2022 | The ap_rwrite() function in Apache HTTP Server 2.4.53 and earlier may read unintended memory if an attacker can cause the server to reflect very large input using ap_rwrite() or ap_rputs(), such as with mod_luas r:puts() function. Modules compiled and distributed separately from… | ||
| CVE-2022-28330 | Med | 0.35 | 5.3 | 0.04 | Jun 9, 2022 | Apache HTTP Server 2.4.53 and earlier on Windows may read beyond bounds when configured to process requests with the mod_isapi module. | ||
| CVE-2020-25073 | Med | 0.35 | 5.3 | 0.02 | Sep 2, 2020 | FreedomBox through 20.13 allows remote attackers to obtain sensitive information from the /server-status page of the Apache HTTP Server, because a connection from the Tor onion service (or from PageKite) is considered a local connection. This affects both the freedombox and… | ||
| CVE-2020-11985 | Med | 0.35 | 5.3 | 0.07 | Aug 7, 2020 | IP address spoofing when proxying using mod_remoteip and mod_rewrite For configurations using proxying with mod_remoteip and certain mod_rewrite rules, an attacker could spoof their IP address for logging and PHP scripts. Note this issue was fixed in Apache HTTP Server 2.4.24… |
- risk 0.40cvss 5.9epss 0.16
The Apache HTTP Server 2.4.17 and 2.4.18, when mod_http2 is enabled, does not limit the number of simultaneous stream workers for a single HTTP/2 connection, which allows remote attackers to cause a denial of service (stream-processing outage) via modified flow-control windows.
- risk 0.39cvss 5.9epss 0.03
When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy…
- risk 0.39cvss 5.3epss 0.61
Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.
- risk 0.39cvss 5.3epss 0.53
Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'
- risk 0.39cvss 5.3epss 0.60
Apache HTTP Server versions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an URL that is not necessarily Upgraded by the origin server was tunneling the whole connection regardless, thus allowing for subsequent requests on the same connection to pass through with no HTTP…
- risk 0.39cvss 5.3epss 0.52
In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a malicious FTP server.
- risk 0.39cvss 5.9epss 0.13
When an HTTP/2 stream was destroyed after being handled, the Apache HTTP Server prior to version 2.4.30 could have written a NULL pointer potentially to an already freed memory. The memory pools maintained by the server make this vulnerability hard to trigger in usual…
- risk 0.37cvss 5.5epss 0.12
Apache HTTP Server versions 2.4.0 to 2.4.46 Unprivileged local users can stop httpd on Windows
- risk 0.36cvss 5.3epss 0.20
A vulnerability was found in Apache HTTP Server 2.4.17 to 2.4.38. Using fuzzed network input, the http/2 request handling could be made to access freed memory in string comparison when determining the method of a request and thus process the request incorrectly.
- risk 0.36cvss 5.3epss 0.18
A vulnerability was found in Apache HTTP Server 2.4.0 to 2.4.38. When the path component of a request URL contains multiple consecutive slashes ('/'), directives such as LocationMatch and RewriteRule must account for duplicates in regular expressions while other aspects of the…
- risk 0.36cvss 5.3epss 0.20
In Apache HTTP server versions 2.4.37 and prior, by sending request bodies in a slow loris way to plain resources, the h2 stream for that request unnecessarily occupied a server thread cleaning up that incoming data. This affects only HTTP/2 (mod_http2) connections.
- risk 0.35cvss 6.5epss 0.01
Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response languages. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
- risk 0.35cvss 6.5epss 0.00
HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers. This issue affects Apache HTTP Server: from through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
- risk 0.35cvss 6.5epss 0.01
Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache HTTP Server through environment variables set via the Apache configuration unexpectedly superseding variables calculated by the server for CGI programs. This issue affects Apache HTTP Server…
- risk 0.35cvss 5.3epss 0.04
A partial fix for CVE-2024-39884 in the core of Apache HTTP Server 2.4.61 ignores some use of the legacy content-type based configuration of handlers. "AddType" and similar configuration, under some circumstances where files are requested indirectly, result in source code…
- risk 0.35cvss 5.4epss 0.02
Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance.
- risk 0.35cvss 5.3epss 0.05
The ap_rwrite() function in Apache HTTP Server 2.4.53 and earlier may read unintended memory if an attacker can cause the server to reflect very large input using ap_rwrite() or ap_rputs(), such as with mod_luas r:puts() function. Modules compiled and distributed separately from…
- risk 0.35cvss 5.3epss 0.04
Apache HTTP Server 2.4.53 and earlier on Windows may read beyond bounds when configured to process requests with the mod_isapi module.
- risk 0.35cvss 5.3epss 0.02
FreedomBox through 20.13 allows remote attackers to obtain sensitive information from the /server-status page of the Apache HTTP Server, because a connection from the Tor onion service (or from PageKite) is considered a local connection. This affects both the freedombox and…
- risk 0.35cvss 5.3epss 0.07
IP address spoofing when proxying using mod_remoteip and mod_rewrite For configurations using proxying with mod_remoteip and certain mod_rewrite rules, an attacker could spoof their IP address for logging and PHP scripts. Note this issue was fixed in Apache HTTP Server 2.4.24…
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