ALPINE-CVE-2023-43622 — Vulnetix

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ALPINE-CVE-2023-43622 PUBLISHED CVSS 7.5 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.

Risk Scores

CVSS v3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
Alpine:v3.22	apache2	0, 2.2.16-r0, 2.2.16-r1
Alpine:v3.16	apache2	2.4.39-r0, 2.4.4-r0, 2.4.4-r1
Alpine:v3.15	apache2	2.4.26-r0, 2.4.25-r1, 2.4.25-r0
Alpine:v3.17	apache2	2.4.46-r2, 2.4.4-r1, 2.4.41-r0
Alpine:v3.20	apache2	2.4.4-r0, 2.4.4-r1, 2.4.41-r0
Alpine:v3.19	apache2	2.4.57-r2, 0, 2.2.16-r0
Alpine:v3.23	apache2	2.4.9-r1, 2.4.9-r0, 2.4.7-r0
Alpine:v3.21	apache2	0, 2.2.16-r0, 2.2.16-r1
Alpine:v3.18	apache2	0, 2.2.16-r0, 2.2.16-r1

Timeline

Oct 23, 2023 CVE Published
Dec 3, 2025 CVE Updated
Apr 30, 2026 Distribution Patch

References

https://security.alpinelinux.org/vuln/CVE-2023-43622 advisory

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