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 httpd-toolsUpgrade httpd-develUpgrade httpdUpgrade mod_proxy_htmlUpgrade mod_ldapUpgrade mod_mdUpgrade httpd-filesystemUpgrade mod_http2Upgrade mod_sslUpgrade httpd-manualUpgrade mod_session | May 8, 2024 | Oct 23, 2023 |
| Alpine Linux | — | Upgrade apache2 | Mar 26, 2024 | Oct 23, 2023 |
| Amazon Linux Ami 2 | — | Upgrade mod_proxy_htmlUpgrade mod_mdUpgrade httpd-manualUpgrade mod_sslUpgrade httpd-toolsUpgrade mod_ldapUpgrade httpd-develUpgrade httpdUpgrade httpd-filesystemUpgrade httpd-debuginfoUpgrade mod_session | Nov 3, 2023 | Oct 23, 2023 |
| Amazon_linux | — | Upgrade httpd24 | Nov 4, 2023 | Oct 23, 2023 |
| Amazon_linux_2023 | — | Upgrade mod_session-debuginfoUpgrade httpd-debugsourceUpgrade mod_luaUpgrade httpd-develUpgrade httpd-debuginfoUpgrade mod_lua-debuginfoUpgrade httpd-filesystemUpgrade httpdUpgrade mod_proxy_html-debuginfoUpgrade mod_ldapUpgrade mod_sessionUpgrade mod_sslUpgrade httpd-tools-debuginfoUpgrade mod_proxy_htmlUpgrade mod_ssl-debuginfoUpgrade httpd-coreUpgrade mod_ldap-debuginfoUpgrade httpd-toolsUpgrade httpd-manualUpgrade httpd-core-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 httpdUpgrade httpd-toolsUpgrade mod_sslUpgrade httpd-filesystem | Jan 10, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade httpd-filesystemUpgrade httpd-toolsUpgrade mod_sslUpgrade httpd | Jan 10, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp8 | — | Upgrade httpd-develUpgrade httpdUpgrade httpd-toolsUpgrade httpd-filesystemUpgrade mod_sessionUpgrade mod_sslUpgrade httpd-manual | Mar 13, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp9 | — | Upgrade httpdUpgrade httpd-toolsUpgrade httpd-filesystemUpgrade mod_ssl | Jan 10, 2024 | Oct 23, 2023 |
| Oracle_linux | — | Upgrade mod_sslUpgrade mod_http2Upgrade mod_ldapUpgrade httpd-filesystemUpgrade mod_proxy_htmlUpgrade mod_sessionUpgrade mod_mdUpgrade httpd-develUpgrade httpd-manualUpgrade httpdUpgrade httpd-tools | May 8, 2024 | Oct 19, 2023 |
| Redhat_linux | — | Upgrade mod_mdNo solution existsUpgrade httpd-develUpgrade mod_sslUpgrade mod_md-debugsourceUpgrade mod_md-debuginfoUpgrade mod_http2-debuginfoUpgrade httpd-tools-debuginfoUpgrade httpd-debuginfoUpgrade mod_sessionUpgrade httpdUpgrade httpd-filesystemUpgrade mod_proxy_htmlUpgrade mod_session-debuginfoUpgrade httpd-manualUpgrade mod_ssl-debuginfoUpgrade mod_ldap-debuginfoUpgrade httpd-debugsourceUpgrade mod_ldapUpgrade httpd-toolsUpgrade mod_http2Upgrade mod_proxy_html-debuginfoUpgrade mod_http2-debugsource | May 1, 2024 | Oct 23, 2023 |
| Rocky_linux | — | Upgrade httpd-debugsourceUpgrade mod_sslUpgrade httpd-debuginfoUpgrade httpd-develUpgrade httpd-tools-debuginfoUpgrade mod_ldapUpgrade mod_md-debuginfoUpgrade httpdUpgrade mod_session-debuginfoUpgrade mod_sessionUpgrade mod_http2-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade mod_ldap-debuginfoUpgrade mod_mdUpgrade mod_ssl-debuginfoUpgrade mod_md-debugsourceUpgrade httpd-toolsUpgrade mod_proxy_htmlUpgrade mod_http2Upgrade mod_http2-debugsource | Jun 17, 2024 | Oct 23, 2023 |
| Ubuntu | — | Upgrade apache2Upgrade apache2 (Ubuntu Pro) | 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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