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_mdUpgrade mod_http2Upgrade mod_ldapUpgrade httpd-filesystemUpgrade mod_sessionUpgrade httpd-manualUpgrade mod_sslUpgrade httpdUpgrade httpd-toolsUpgrade mod_proxy_htmlUpgrade httpd-devel | 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_ldapUpgrade mod_sessionUpgrade httpd-develUpgrade httpd-filesystemUpgrade mod_sslUpgrade httpd-toolsUpgrade mod_mdUpgrade httpd-manualUpgrade mod_proxy_html | Nov 3, 2023 | Oct 23, 2023 |
| Amazon_linux | — | Upgrade httpd24 | Nov 4, 2023 | Oct 23, 2023 |
| Amazon_linux_2023 | — | Upgrade mod_ldap-debuginfoUpgrade httpd-coreUpgrade mod_proxy_htmlUpgrade httpd-core-debuginfoUpgrade httpd-manualUpgrade mod_ssl-debuginfoUpgrade httpd-toolsUpgrade httpd-debugsourceUpgrade mod_lua-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade mod_luaUpgrade httpd-tools-debuginfoUpgrade httpd-filesystemUpgrade mod_sessionUpgrade mod_sslUpgrade mod_session-debuginfoUpgrade httpd-develUpgrade httpd-debuginfoUpgrade mod_ldapUpgrade httpd | 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-filesystemUpgrade mod_sslUpgrade httpd-tools | Jan 10, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade mod_sslUpgrade httpdUpgrade httpd-filesystemUpgrade httpd-tools | Jan 10, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp8 | — | Upgrade httpdUpgrade httpd-develUpgrade httpd-toolsUpgrade httpd-filesystemUpgrade mod_sessionUpgrade mod_sslUpgrade httpd-manual | Mar 13, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp9 | — | Upgrade httpd-filesystemUpgrade mod_sslUpgrade httpd-toolsUpgrade httpd | Jan 10, 2024 | Oct 23, 2023 |
| Oracle_linux | — | Upgrade mod_ldapUpgrade mod_sessionUpgrade mod_http2Upgrade mod_sslUpgrade mod_proxy_htmlUpgrade httpd-filesystemUpgrade mod_mdUpgrade httpd-develUpgrade httpdUpgrade httpd-manualUpgrade httpd-tools | May 8, 2024 | Oct 19, 2023 |
| Redhat_linux | — | Upgrade mod_md-debuginfoUpgrade mod_mdUpgrade mod_sessionUpgrade httpdUpgrade httpd-debuginfoUpgrade mod_sslUpgrade httpd-filesystemUpgrade mod_md-debugsourceUpgrade httpd-tools-debuginfoUpgrade httpd-develUpgrade mod_http2-debuginfoNo solution existsUpgrade mod_ssl-debuginfoUpgrade mod_ldap-debuginfoUpgrade httpd-debugsourceUpgrade mod_proxy_html-debuginfoUpgrade mod_http2-debugsourceUpgrade httpd-toolsUpgrade mod_proxy_htmlUpgrade mod_session-debuginfoUpgrade mod_http2Upgrade mod_ldapUpgrade httpd-manual | May 1, 2024 | Oct 23, 2023 |
| Rocky_linux | — | Upgrade httpd-toolsUpgrade mod_md-debugsourceUpgrade mod_ssl-debuginfoUpgrade mod_proxy_htmlUpgrade mod_http2Upgrade mod_http2-debugsourceUpgrade httpd-tools-debuginfoUpgrade mod_sslUpgrade mod_session-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade mod_md-debuginfoUpgrade mod_ldapUpgrade httpd-debugsourceUpgrade mod_sessionUpgrade mod_mdUpgrade mod_ldap-debuginfoUpgrade httpdUpgrade httpd-develUpgrade mod_http2-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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