cpe:2.3:a:apache:http_server:2.2.9:*:*:*:*:*:*:*
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 and open and causing the memory footprint to keep on growing. On connection close, all resources were reclaimed, but the process might run out of memory before that. This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid Reset Exploit) with their own test client. During "normal" HTTP/2 use, the probability to hit this bug is very low. The kept memory would not become noticeable before the connection closes or times out. Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Max CVSS
5.9
EPSS Score
0.18%
Published
2023-10-23
Updated
2023-11-01
Out-of-bounds Read vulnerability in mod_macro of Apache HTTP Server.This issue affects Apache HTTP Server: through 2.4.57.
Max CVSS
7.5
EPSS Score
0.76%
Published
2023-10-23
Updated
2023-11-03
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.
Max CVSS
5.3
EPSS Score
0.08%
Published
2023-01-17
Updated
2023-09-08
Apache HTTP Server 2.4.53 and earlier may not send the X-Forwarded-* headers to the origin server based on client side Connection header hop-by-hop mechanism. This may be used to bypass IP based authentication on the origin server/application.
Max CVSS
9.8
EPSS Score
1.06%
Published
2022-06-09
Updated
2022-08-19
Apache HTTP Server 2.4.53 and earlier may return lengths to applications calling r:wsread() that point past the end of the storage allocated for the buffer.
Max CVSS
7.5
EPSS Score
0.45%
Published
2022-06-09
Updated
2023-07-21
In Apache HTTP Server 2.4.53 and earlier, a malicious request to a lua script that calls r:parsebody(0) may cause a denial of service due to no default limit on possible input size.
Max CVSS
7.5
EPSS Score
4.52%
Published
2022-06-09
Updated
2022-08-24
Apache HTTP Server 2.4.53 and earlier may crash or disclose information due to a read beyond bounds in ap_strcmp_match() when provided with an extremely large input buffer. While no code distributed with the server can be coerced into such a call, third-party modules or lua scripts that use ap_strcmp_match() may hypothetically be affected.
Max CVSS
9.1
EPSS Score
1.48%
Published
2022-06-09
Updated
2022-08-24
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 Apache HTTP Server that use the 'ap_rputs' function and may pass it a very large (INT_MAX or larger) string must be compiled against current headers to resolve the issue.
Max CVSS
5.3
EPSS Score
0.35%
Published
2022-06-09
Updated
2022-08-24
Apache HTTP Server 2.4.53 and earlier on Windows may read beyond bounds when configured to process requests with the mod_isapi module.
Max CVSS
5.3
EPSS Score
0.16%
Published
2022-06-09
Updated
2022-06-24
If LimitXMLRequestBody is set to allow request bodies larger than 350MB (defaults to 1M) on 32 bit systems an integer overflow happens which later causes out of bounds writes. This issue affects Apache HTTP Server 2.4.52 and earlier.
Max CVSS
9.1
EPSS Score
0.45%
Published
2022-03-14
Updated
2022-11-02
Apache HTTP Server 2.4.52 and earlier fails to close inbound connection when errors are encountered discarding the request body, exposing the server to HTTP Request Smuggling
Max CVSS
9.8
EPSS Score
1.56%
Published
2022-03-14
Updated
2022-11-02
A carefully crafted request body can cause a read to a random memory area which could cause the process to crash. This issue affects Apache HTTP Server 2.4.52 and earlier.
Max CVSS
7.5
EPSS Score
38.74%
Published
2022-03-14
Updated
2022-11-02
A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.
Max CVSS
9.8
EPSS Score
9.75%
Published
2021-12-20
Updated
2023-04-03

CVE-2021-40438

Known exploited
A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.
Max CVSS
9.0
EPSS Score
97.41%
Published
2021-09-16
Updated
2022-10-05
CISA KEV Added
2021-12-01
ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier.
Max CVSS
9.8
EPSS Score
0.58%
Published
2021-09-16
Updated
2022-10-05
Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.
Max CVSS
7.5
EPSS Score
0.46%
Published
2021-09-16
Updated
2022-10-28
A specially crafted HTTP request header could have crashed the Apache HTTP Server prior to version 2.4.30 due to an out of bound read while preparing data to be cached in shared memory. It could be used as a Denial of Service attack against users of mod_cache_socache. The vulnerability is considered as low risk since mod_cache_socache is not widely used, mod_cache_disk is not concerned by this vulnerability.
Max CVSS
7.5
EPSS Score
96.34%
Published
2018-03-26
Updated
2021-06-06
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 configurations, the reporter and the team could not reproduce it outside debug builds, so it is classified as low risk.
Max CVSS
5.9
EPSS Score
1.91%
Published
2018-03-26
Updated
2021-06-06
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 header. This vulnerability is considered very hard if not impossible to trigger in non-debug mode (both log and build level), so it is classified as low risk for common server usage.
Max CVSS
5.9
EPSS Score
0.92%
Published
2018-03-26
Updated
2021-06-06

CVE-2017-9798

Public exploit
Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user's .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c.
Max CVSS
7.5
EPSS Score
97.31%
Published
2017-09-18
Updated
2021-06-06
In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, the value placeholder in [Proxy-]Authorization headers of type 'Digest' was not initialized or reset before or between successive key=value assignments by mod_auth_digest. Providing an initial key with no '=' assignment could reflect the stale value of uninitialized pool memory used by the prior request, leading to leakage of potentially confidential information, and a segfault in other cases resulting in denial of service.
Max CVSS
9.1
EPSS Score
46.78%
Published
2017-07-13
Updated
2021-06-06
In Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26, mod_mime can read one byte past the end of a buffer when sending a malicious Content-Type response header.
Max CVSS
9.8
EPSS Score
0.64%
Published
2017-06-20
Updated
2021-06-06
In Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26, use of the ap_get_basic_auth_pw() by third-party modules outside of the authentication phase may lead to authentication requirements being bypassed.
Max CVSS
9.8
EPSS Score
1.40%
Published
2017-06-20
Updated
2021-06-06
Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the whitespace accepted from requests and sent in response lines and headers. Accepting these different behaviors represented a security concern when httpd participates in any chain of proxies or interacts with back-end application servers, either through mod_proxy or using conventional CGI mechanisms, and may result in request smuggling, response splitting and cache pollution.
Max CVSS
7.5
EPSS Score
0.27%
Published
2017-07-27
Updated
2022-09-07
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 Segmentation Fault in the serving httpd process.
Max CVSS
4.3
EPSS Score
0.11%
Published
2018-03-09
Updated
2023-02-12
74 vulnerabilities found
1 2 3
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