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