Total
58 CVE
| CVE | Vendors | Products | Updated | CVSS v2 | CVSS v3 |
|---|---|---|---|---|---|
| CVE-2021-34798 | 8 Apache, Broadcom, Debian and 5 more | 18 Http Server, Brocade Fabric Operating System Firmware, Debian Linux and 15 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier. | |||||
| CVE-2021-33503 | 3 Fedoraproject, Oracle, Python | 5 Fedora, Enterprise Manager Ops Center, Instantis Enterprisetrack and 2 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect. | |||||
| CVE-2021-31618 | 4 Apache, Debian, Fedoraproject and 1 more | 6 Http Server, Debian Linux, Fedora and 3 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released. | |||||
| CVE-2021-30641 | 4 Apache, Debian, Fedoraproject and 1 more | 6 Http Server, Debian Linux, Fedora and 3 more | 2026-06-17 | 5.0 MEDIUM | 5.3 MEDIUM |
| Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF' | |||||
| CVE-2021-26691 | 5 Apache, Debian, Fedoraproject and 2 more | 8 Http Server, Debian Linux, Fedora and 5 more | 2026-06-17 | 7.5 HIGH | 9.8 CRITICAL |
| In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow | |||||
| CVE-2021-26690 | 4 Apache, Debian, Fedoraproject and 1 more | 6 Http Server, Debian Linux, Fedora and 3 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service | |||||
| CVE-2021-22222 | 3 Debian, Oracle, Wireshark | 5 Debian Linux, Enterprise Manager Ops Center, Instantis Enterprisetrack and 2 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| Infinite loop in DVB-S2-BB dissector in Wireshark 3.4.0 to 3.4.5 allows denial of service via packet injection or crafted capture file | |||||
| CVE-2020-9490 | 7 Apache, Canonical, Debian and 4 more | 25 Http Server, Ubuntu Linux, Debian Linux and 22 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| Apache HTTP Server versions 2.4.20 to 2.4.43. A specially crafted value for the 'Cache-Digest' header in a HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource afterwards. Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability for unpatched servers. | |||||
| CVE-2020-35452 | 4 Apache, Debian, Fedoraproject and 1 more | 6 Http Server, Debian Linux, Fedora and 3 more | 2026-06-17 | 6.8 MEDIUM | 7.3 HIGH |
| Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow | |||||
| CVE-2020-1935 | 6 Apache, Canonical, Debian and 3 more | 20 Tomcat, Ubuntu Linux, Debian Linux and 17 more | 2026-06-17 | 5.8 MEDIUM | 4.8 MEDIUM |
| In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely. | |||||
| CVE-2020-1934 | 6 Apache, Canonical, Debian and 3 more | 11 Http Server, Ubuntu Linux, Debian Linux and 8 more | 2026-06-17 | 5.0 MEDIUM | 5.3 MEDIUM |
| 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-2020-1927 | 8 Apache, Broadcom, Canonical and 5 more | 14 Http Server, Brocade Fabric Operating System, Ubuntu Linux and 11 more | 2026-06-17 | 5.8 MEDIUM | 6.1 MEDIUM |
| 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 an an unexpected URL within the request URL. | |||||
| CVE-2020-17527 | 4 Apache, Debian, Netapp and 1 more | 12 Tomcat, Debian Linux, Element Plug-in and 9 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests. | |||||
| CVE-2020-13950 | 4 Apache, Debian, Fedoraproject and 1 more | 6 Http Server, Debian Linux, Fedora and 3 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service | |||||
| CVE-2020-13943 | 3 Apache, Debian, Oracle | 4 Tomcat, Debian Linux, Instantis Enterprisetrack and 1 more | 2026-06-17 | 4.0 MEDIUM | 4.3 MEDIUM |
| If an HTTP/2 client connecting to Apache Tomcat 10.0.0-M1 to 10.0.0-M7, 9.0.0.M1 to 9.0.37 or 8.5.0 to 8.5.57 exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. This could lead to users seeing responses for unexpected resources. | |||||
| CVE-2020-11993 | 7 Apache, Canonical, Debian and 4 more | 13 Http Server, Ubuntu Linux, Debian Linux and 10 more | 2026-06-17 | 4.3 MEDIUM | 7.5 HIGH |
| Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers. | |||||
| CVE-2020-11987 | 4 Apache, Debian, Fedoraproject and 1 more | 22 Batik, Debian Linux, Fedora and 19 more | 2026-06-17 | 6.4 MEDIUM | 8.2 HIGH |
| Apache Batik 1.13 is vulnerable to server-side request forgery, caused by improper input validation by the NodePickerPanel. By using a specially-crafted argument, an attacker could exploit this vulnerability to cause the underlying server to make arbitrary GET requests. | |||||
| CVE-2020-11984 | 7 Apache, Canonical, Debian and 4 more | 13 Http Server, Ubuntu Linux, Debian Linux and 10 more | 2026-06-17 | 7.5 HIGH | 9.8 CRITICAL |
| Apache HTTP server 2.4.32 to 2.4.44 mod_proxy_uwsgi info disclosure and possible RCE | |||||
| CVE-2020-11655 | 7 Canonical, Debian, Netapp and 4 more | 18 Ubuntu Linux, Debian Linux, Ontap Select Deploy Administration Utility and 15 more | 2026-06-17 | 5.0 MEDIUM | 7.5 HIGH |
| SQLite through 3.31.1 allows attackers to cause a denial of service (segmentation fault) via a malformed window-function query because the AggInfo object's initialization is mishandled. | |||||
| CVE-2019-9517 | 12 Apache, Apple, Canonical and 9 more | 25 Http Server, Traffic Server, Mac Os X and 22 more | 2026-06-17 | 7.8 HIGH | 7.5 HIGH |
| Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both. | |||||