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.
CVSS Details
- CVSS 3.1 Base Score: 5.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade mod_proxy_htmlUpgrade httpdUpgrade httpd-develUpgrade httpd-toolsUpgrade mod_sslUpgrade httpd-filesystemUpgrade mod_mdUpgrade mod_sessionUpgrade mod_ldapUpgrade httpd-manualUpgrade mod_http2 | May 8, 2024 | Oct 23, 2023 |
| Alpine Linux | — | Upgrade apache2 | Mar 26, 2024 | Oct 23, 2023 |
| Amazon Linux Ami 2 | — | Upgrade httpd-debuginfoUpgrade httpdUpgrade mod_sessionUpgrade httpd-filesystemUpgrade httpd-develUpgrade mod_ldapUpgrade httpd-manualUpgrade httpd-toolsUpgrade mod_mdUpgrade mod_proxy_htmlUpgrade mod_ssl | Nov 3, 2023 | Oct 23, 2023 |
| Amazon_linux | — | Upgrade httpd24 | Nov 4, 2023 | Oct 23, 2023 |
| Amazon_linux_2023 | — | Upgrade httpd-debuginfoUpgrade httpd-develUpgrade mod_sessionUpgrade mod_session-debuginfoUpgrade mod_lua-debuginfoUpgrade mod_sslUpgrade httpd-debugsourceUpgrade mod_luaUpgrade mod_proxy_html-debuginfoUpgrade httpd-filesystemUpgrade mod_ldapUpgrade httpd-tools-debuginfoUpgrade httpdUpgrade mod_proxy_htmlUpgrade httpd-core-debuginfoUpgrade mod_ldap-debuginfoUpgrade httpd-coreUpgrade httpd-toolsUpgrade httpd-manualUpgrade mod_ssl-debuginfo | Feb 17, 2025 | Oct 19, 2023 |
| Apache Httpd | — | Upgrade to the latest version of Apache HTTPD | Nov 29, 2023 | Oct 23, 2023 |
| Debian | — | Upgrade apache2 | Apr 18, 2024 | Oct 23, 2023 |
| Freebsd | — | Upgrade apache24 | Dec 10, 2025 | Oct 19, 2023 |
| Gentoo Linux | — | Upgrade www-servers/apache. | Aug 16, 2026 | Aug 13, 2026 |
| Huawei Euleros 2_0_sp10 | — | Upgrade mod_sslUpgrade httpd-toolsUpgrade httpd-filesystemUpgrade httpd | Jan 10, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade httpdUpgrade mod_sslUpgrade httpd-toolsUpgrade httpd-filesystem | Jan 10, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp8 | — | Upgrade httpd-toolsUpgrade httpdUpgrade httpd-develUpgrade mod_sslUpgrade httpd-manualUpgrade httpd-filesystemUpgrade mod_session | Mar 13, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp9 | — | Upgrade httpd-toolsUpgrade httpdUpgrade httpd-filesystemUpgrade mod_ssl | Jan 10, 2024 | Oct 23, 2023 |
| Oracle_linux | — | Upgrade httpd-filesystemUpgrade mod_http2Upgrade mod_ldapUpgrade mod_sessionUpgrade mod_proxy_htmlUpgrade mod_sslUpgrade mod_mdUpgrade httpd-develUpgrade httpdUpgrade httpd-toolsUpgrade httpd-manual | May 8, 2024 | Oct 19, 2023 |
| Redhat_linux | — | Upgrade mod_http2Upgrade mod_ldapUpgrade mod_ssl-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade httpd-debugsourceUpgrade mod_proxy_htmlUpgrade mod_session-debuginfoUpgrade httpd-toolsUpgrade mod_http2-debugsourceUpgrade httpd-manualUpgrade mod_ldap-debuginfoUpgrade httpd-develUpgrade mod_sessionUpgrade mod_mdUpgrade mod_http2-debuginfoUpgrade httpd-tools-debuginfoUpgrade httpdUpgrade mod_md-debugsourceUpgrade httpd-debuginfoUpgrade httpd-filesystemUpgrade mod_md-debuginfoUpgrade mod_sslNo solution exists | May 1, 2024 | Oct 23, 2023 |
| Rocky_linux | — | Upgrade mod_http2Upgrade mod_md-debugsourceUpgrade mod_proxy_htmlUpgrade httpd-toolsUpgrade mod_ssl-debuginfoUpgrade mod_http2-debugsourceUpgrade mod_sslUpgrade httpdUpgrade mod_sessionUpgrade mod_session-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade mod_md-debuginfoUpgrade httpd-debugsourceUpgrade mod_ldapUpgrade mod_ldap-debuginfoUpgrade mod_http2-debuginfoUpgrade httpd-develUpgrade mod_mdUpgrade httpd-tools-debuginfoUpgrade httpd-debuginfo | Jun 17, 2024 | Oct 23, 2023 |
| Ubuntu | — | Upgrade apache2 (Ubuntu Pro)Upgrade apache2 | Nov 23, 2023 | Oct 23, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Oct 23, 2023 |
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