HS
Web Server
HTTP Server
by Apache · last CVE Oct 1, 2026
On CISA KEVExploited in the wildRansomware-linked
351
CVEs
5
On KEV
9.8
Max CVSS
20
New 30D
Severity mix
Critical 33High 93Medium 43Low 1
Watch

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CVECVSSEPSSPublishedSummary · affected versions
CVE-2026-43951
6.5
1%
Jun 8
Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash
Affected: 2.4.0 through 2.4.67
CVE-2026-33523
6.5
0%
May 4
Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line
Affected: 2.4.0 through 2.4.66
CVE-2025-65082
6.5
1%
Dec 5
Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache HTTP Server through environment variables set via the Apache configuration unexpectedly…
Affected: 2.4.0 before 2.4.66
CVE-2017-12171
6.5
8%
Jul 26
A regression was found in the Red Hat Enterprise Linux 6.9 version of httpd 2.2.15-60, causing comments in the "Allow" and "Deny" configuration lines to be parsed incorrectly
Affected: 2.2.15-60
CVE-2025-54090
6.3
1%
Jul 23
A bug in Apache HTTP Server 2.4.64 results in all "RewriteCond expr ..." tests evaluating as "true"
Affected: 2.4.64
CVE-2024-24795
6.3
3%
Apr 4
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…
Affected: 2.4.0 before 2.4.59
CVE-2024-39884
6.2
1%
Jul 4
A regression in the core of Apache HTTP Server 2.4.60 ignores some use of the legacy content-type based configuration of handlers.   "AddType" and similar configuration, under…
Affected: 2.4.60
CVE-2026-29170
6.1
1%
Jun 8
Apache HTTP Server: mod_proxy_ftp XSS
Affected: through 2.4.67
CVE-2020-1927
6.1
57%
Apr 2
In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to…
Affected: 2.4.0 through 2.4.41
CVE-2019-10092
6.1
81%
Sep 26
In Apache HTTP Server 2.4.0-2.4.39, a limited cross-site scripting issue was reported affecting the mod_proxy error page
Affected: 2.4.0 through 2.4.39
CVE-2019-10098
6.1
74%
Sep 25
In Apache HTTP server 2.4.0 to 2.4.39, Redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to…
Affected: 2.4.0 through 2.4.39
CVE-2016-4975
6.1
20%
Aug 14
mod_userdir CRLF injection
Affected: Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23); Fixed in Apache HTTP Server 2.2.32 (Affected 2.2.0-2.2.31)
CVE-2007-4465
6.1
26%
Sep 14
Cross-site scripting (XSS) vulnerability in mod_autoindex.c in the Apache HTTP Server before 2.2.6, when the charset on a server-generated page is not defined, allows remote…
Affected: 2.0.0 before 2.0.61; 2.2.0 before 2.2.6
CVE-2023-45802
5.9
3%
Oct 23
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
Affected: 2.4.17 before 2.4.58
CVE-2018-11763
5.9
51%
Sep 25
In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout…
Affected: 2.4.17 through 2.4.34
CVE-2018-1302
5.9
13%
Mar 26
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
Affected: through 2.4.29
CVE-2018-1301
5.9
15%
Mar 26
A specially crafted request could have crashed the Apache HTTP Server prior to version 2.4.30, due to an out of bound access after a size limit is reached by reading the HTTP…
Affected: through 2.4.29
CVE-2016-1546
5.9
16%
Jul 6
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…
Affected: 2.4.17; 2.4.18
CVE-2026-44119
5.5
0%
Jun 8
Apache HTTP Server: escalation of privilege through expressions in .htaccess in multiple modules
Affected: 2.4.0 through 2.4.67
CVE-2020-13938
5.5
12%
Jun 10
Apache HTTP Server versions 2.4.0 to 2.4.46 Unprivileged local users can stop httpd on Windows
Affected: 2.4.0 through 2.4.46
CVE-2025-66200
5.4
1%
Dec 5
mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server
Affected: 2.4.7 before 2.4.66
CVE-2024-36387
5.4
2%
Jul 1
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
Affected: 2.4.55 through 2.4.59
CVE-2026-79768
5.3
1%
Oct 1
Apache HTTP Server: mod_userdir information disclosure
Affected: 2.4.0 through 2.4.68
CVE-2026-58415
5.3
0%
Oct 1
Apache HTTP Server: mod_dav_fs property database read access
Affected: 2.4.0 through 2.4.68
CVE-2026-33007
5.3
1%
May 4
Apache HTTP Server: mod_authn_socache crash
Affected: 2.4.0 through 2.4.66
CVE-2026-33857
5.3
0%
May 4
Apache HTTP Server: Off-by-one OOB reads in AJP getter functions
Affected: through 2.4.66
CVE-2026-34032
5.3
0%
May 4
Apache HTTP Server: mod_proxy_ajp: Heap Buffer Over-Read Due to Missing Null-Termination Check (ajp_msg_get_string)
Affected: through 2.4.66
CVE-2024-40725
5.3
4%
Jul 18
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
Affected: 2.4.60; 2.4.61
CVE-2022-37436
5.3
56%
Jan 17
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
Affected: before 2.4.55
CVE-2022-28614
5.3
5%
Jun 9
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…
Affected: through 2.4.53
CVE-2022-28330
5.3
4%
Jun 9
Apache HTTP Server 2.4.53 and earlier on Windows may read beyond bounds when configured to process requests with the mod_isapi module
Affected: through 2.4.53
CVE-2021-30641
5.3
53%
Jun 10
Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'
Affected: 2.4.39 through 2.4.46
CVE-2019-17567
5.3
60%
Jun 10
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…
Affected: 2.4.6 through 2.4.46
CVE-2020-11985
5.3
7%
Aug 7
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…
Affected: 2.4.1 through 2.4.23
CVE-2020-1934
5.3
52%
Apr 1
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
Affected: 2.4.0 through 2.4.41
CVE-2019-0196
5.3
20%
Jun 11
A vulnerability was found in Apache HTTP Server 2.4.17 to 2.4.38
Affected: 2.4.17 through 2.4.38
CVE-2019-0220
5.3
18%
Jun 11
A vulnerability was found in Apache HTTP Server 2.4.0 to 2.4.38
Affected: 2.4.0 through 2.4.38
CVE-2018-17189
5.3
20%
Jan 30
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…
Affected: 2.4.17 to 2.4.37
CVE-2018-1283
5.3
10%
Mar 26
In Apache httpd 2.4.0 to 2.4.29, when mod_session is configured to forward its session data to CGI applications (SessionEnv on, not the default), a remote user may influence their…
Affected: 2.4.0 through 2.4.29
CVE-2026-33006
4.8
1%
May 4
Apache HTTP Server: mod_auth_digest timing attack
Affected: through 2.4.66
CVE-2026-42528
4.3
0%
Oct 1
Apache HTTP Server: mod_dav shared lock overflow
Affected: through 2.4.68
CVE-2016-8612
4.3
4%
Mar 9
Apache HTTP Server mod_cluster before version httpd 2.4.23 is vulnerable to an Improper Input Validation in the protocol parsing logic in the load balancer resulting in a…
Affected: before 2.4.23
CVE-2019-0197
4.2
9%
Jun 11
A vulnerability was found in Apache HTTP Server 2.4.34 to 2.4.38
Affected: 2.4.34 through 2.4.38
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