CVE-2023-43622

Aliases:ALPINE-CVE-2023-43622DEBIAN-CVE-2023-43622
Advisory lineage Upstream: 0 Downstream: 8
Modified
Published: 23 Oct 2023, 06:50
Last modified:13 Feb 2025, 17:13

Vulnerability Summary

Overall Risk (default)
medium
44/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
70.59% CRITICAL
71% probability +11.53%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Oct 2023, 06:50
Published
Vulnerability first disclosed
13 Feb 2025, 17:13
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 70.59%• Percentile: 99%

Techniques & Countermeasures

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

Affected Systems

  • apache software foundation•apache http server

    ≥ 2.4.55, ≤ 2.4.57

  • apache•http_server

    ≥ 2.4.55, < 2.4.58

  • alpine•apache2

    < 2.4.58-r0 | < 2.4.58-r0 | < 2.4.58-r0 | < 2.4.58-r0 | < 2.4.58-r0 | < 2.4.58-r0 | < 2.4.58-r0 | < 2.4.58-r0 | < 2.4.58-r0 | < 2.4.58-r0

  • debian•apache2

    < 2.4.59-1~deb11u1 | < 2.4.59-1~deb12u1 | < 2.4.58-1 | < 2.4.58-1

References (4)