CVE-2023-43622

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 99%
Affected Products (NVD)
VendorProductVersion
apachehttp_server
2.4.55 ≤
𝑥
< 2.4.58
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
apache2
bookworm
2.4.62-1~deb12u2
fixed
bookworm (security)
2.4.62-1~deb12u2
fixed
bullseye
2.4.62-1~deb11u1
fixed
bullseye (security)
2.4.62-1~deb11u2
fixed
buster
not-affected
sid
2.4.62-3
fixed
trixie
2.4.62-3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
apache2
bionic
not-affected
focal
not-affected
jammy
not-affected
lunar
Fixed 2.4.55-1ubuntu2.1
released
mantic
Fixed 2.4.57-2ubuntu2.1
released
trusty
not-affected
xenial
not-affected
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
apache2
suse enterprise desktop 15 SP6
2.4.58-150600.3.2
fixed
suse enterprise desktop 15 SP7
2.4.62-150700.2.2
fixed
suse enterprise sap 15 SP6
2.4.58-150600.3.2
fixed
suse enterprise sap 15 SP7
2.4.62-150700.2.2
fixed
suse enterprise server 15 SP6
2.4.58-150600.3.2
fixed
suse enterprise server 15 SP7
2.4.62-150700.2.2
fixed
apache2-devel
suse enterprise sap 15 SP7
2.4.62-150700.2.1
fixed
suse enterprise server 15 SP7
2.4.62-150700.2.1
fixed
apache2-prefork
suse enterprise desktop 15 SP6
2.4.58-150600.3.2
fixed
suse enterprise desktop 15 SP7
2.4.62-150700.2.4
fixed
suse enterprise sap 15 SP6
2.4.58-150600.3.2
fixed
suse enterprise sap 15 SP7
2.4.62-150700.2.4
fixed
suse enterprise server 15 SP6
2.4.58-150600.3.2
fixed
suse enterprise server 15 SP7
2.4.62-150700.2.4
fixed
apache2-utils
suse enterprise sap 15 SP7
2.4.62-150700.2.4
fixed
suse enterprise server 15 SP7
2.4.62-150700.2.4
fixed
apache2-worker
suse enterprise sap 15 SP7
2.4.62-150700.2.4
fixed
suse enterprise server 15 SP7
2.4.62-150700.2.4
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
mod
RHEL 9
0:2.0.26-1.el9
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
httpd
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-core
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-core-debuginfo
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-debuginfo
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-debugsource
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-devel
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-filesystem
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-manual
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-tools
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd-tools-debuginfo
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
httpd24
Amazon Linux 1
0:2.4.58-1.101.amzn1
fixed
httpd24-debuginfo
Amazon Linux 1
0:2.4.58-1.101.amzn1
fixed
httpd24-devel
Amazon Linux 1
0:2.4.58-1.101.amzn1
fixed
httpd24-manual
Amazon Linux 1
0:2.4.58-1.101.amzn1
fixed
httpd24-tools
Amazon Linux 1
0:2.4.58-1.101.amzn1
fixed
mod24_ldap
Amazon Linux 1
0:2.4.58-1.101.amzn1
fixed
mod24_md
Amazon Linux 1
0:2.4.58-1.101.amzn1
fixed
mod24_proxy_html
Amazon Linux 1
1:2.4.58-1.101.amzn1
fixed
mod24_session
Amazon Linux 1
0:2.4.58-1.101.amzn1
fixed
mod24_ssl
Amazon Linux 1
1:2.4.58-1.101.amzn1
fixed
mod_ldap
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
mod_ldap-debuginfo
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
mod_lua
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
mod_lua-debuginfo
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
mod_md
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
mod_proxy_html
Amazon Linux 2
1:2.4.58-1.amzn2
fixed
Amazon Linux 2023
1:2.4.58-1.amzn2023
fixed
mod_proxy_html-debuginfo
Amazon Linux 2023
1:2.4.58-1.amzn2023
fixed
mod_session
Amazon Linux 2
0:2.4.58-1.amzn2
fixed
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
mod_session-debuginfo
Amazon Linux 2023
0:2.4.58-1.amzn2023
fixed
mod_ssl
Amazon Linux 2
1:2.4.58-1.amzn2
fixed
Amazon Linux 2023
1:2.4.58-1.amzn2023
fixed
mod_ssl-debuginfo
Amazon Linux 2023
1:2.4.58-1.amzn2023
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
httpd
CBL-Mariner 2.0
0:2.4.58-1.cm2
fixed
mod_http2
Azure Linux 3.0
0:2.0.29-3.azl3
fixed
Common Weakness Enumeration
References
https://httpd.apache.org/security/vulnerabilities_24.html
https://security.netapp.com/advisory/ntap-20231027-0011/
https://httpd.apache.org/security/vulnerabilities_24.html
https://security.netapp.com/advisory/ntap-20231027-0011/