apache2: An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connect...
CVE-2023-43622 is fixed in 22 products on 1 platform, first by DEBIAN-CVE-2023-43622, released October 23, 2023. It is not reported as exploited. Patch Radar priority: High.
An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known "slow loris" attack pattern. This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| apache2 · Debian 12.15 (bookworm) | 2.4.59-1~deb12u1 | DEBIAN-CVE-2023-43622 | Oct 23, 2023 |
| apache2 · Debian 13.5 (trixie) | 2.4.58-1 | DEBIAN-CVE-2023-43622 | Oct 23, 2023 |
| apache2 · Debian 14 | 2.4.58-1 | DEBIAN-CVE-2023-43622 | Oct 23, 2023 |
| httpd · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-core · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-core-debuginfo · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-debuginfo · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-debugsource · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-devel · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-filesystem · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-manual · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-tools · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| httpd-tools-debuginfo · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_http2 · RHEL 9 | 0:2.0.26-1.el9 | RHSA-2024:2368 | Apr 30, 2024 |
| mod_http2 · almalinux 9 | 2.0.26-1.el9 | ALSA-2024:2368 | Apr 30, 2024 |
| mod_http2 · ol 9 | 0:2.0.26-1.el9 | ELSA-2024-2368 | May 2, 2024 |
| mod_ldap · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_ldap-debuginfo · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_lua · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_lua-debuginfo · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_proxy_html · amzn 2023 | 1:2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_proxy_html-debuginfo · amzn 2023 | 1:2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_session · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_session-debuginfo · amzn 2023 | 2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_ssl · amzn 2023 | 1:2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
| mod_ssl-debuginfo · amzn 2023 | 1:2.4.58-1.amzn2023 | ALAS2023-2023-433 | Nov 9, 2023 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.