CVE catalog
CVE-2023-43622
apache2: CVE-2023-43622
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 68.82% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | apache2 | sid | 2.4.69-1 | fixed |
| Debian | apache2 | forky | 2.4.69-1 | fixed |
| Debian | apache2 | trixie | 2.4.68-1~deb13u1 | fixed |
| Debian | apache2 | trixie-security | 2.4.69-1~deb13u1 | fixed |
| Debian | apache2 | bookworm | 2.4.68-1~deb12u1 | fixed |
| Debian | apache2 | bookworm-security | 2.4.67-1~deb12u3 | fixed |
| Alpine | apache2 | 3.15 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.16 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.17 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.18 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.19 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.20 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.21 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.22 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.23 | 2.4.58-r0 | fixed |
| Alpine | apache2 | 3.24 | 2.4.58-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | apache2 | source | sid | 2.4.58-1 | not yet assigned | Not reported | Not reported |
| Debian | apache2 | source | forky | 2.4.58-1 | not yet assigned | Not reported | Not reported |
| Debian | apache2 | source | trixie | 2.4.58-1 | not yet assigned | Not reported | Not reported |
| Debian | apache2 | source | bookworm | 2.4.59-1~deb12u1 | not yet assigned | Not reported | Not reported |
| Alpine | apache2 | apk | 3.15 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.16 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.17 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.18 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.19 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.20 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.21 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.22 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.23 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
| Alpine | apache2 | apk | 3.24 | 2.4.58-r0 | Not reported | ALPINE-CVE-2023-43622 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-784301.json]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2024_13350-1.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2023-43622]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2023-43622]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2023-43622]
- [https://security-tracker.debian.org/tracker/CVE-2023-43622]
- [https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-43622.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-2917.json]
[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]