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