High severity7.5NVD Advisory· Published Oct 23, 2023· Updated Jun 17, 2026
CVE-2023-43622
CVE-2023-43622
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
6cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*range: >=2.4.55,<2.4.58
- (no CPE)range: 2.4.55 - 2.4.57
- (no CPE)range: 2.4.55
- osv-coords3 versions
>= 2.4.55, < 2.4.58+ 2 more
- (no CPE)range: >= 2.4.55, < 2.4.58
- (no CPE)range: < 2.0.26-1.el9
- (no CPE)range: < 2.4.58-1.1
Patches
Vulnerability mechanics
References
2- httpd.apache.org/security/vulnerabilities_24.htmlnvdVendor Advisory
- security.netapp.com/advisory/ntap-20231027-0011/nvdThird Party Advisory
News mentions
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