CVE-2023-43622: vulnerability in Apache HTTP Server
Apache HTTP Server: DoS in HTTP/2 with initial windows size 0
Published · Updated
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15Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 69%
What the vendors declare (VEX)
Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.
Red HatVEX document ↗
Fixed
Not affected
2 products (3 components) — because the vulnerable code is not present in the product
Red Hat Enterprise Linux 8 · Red Hat JBoss Core Services
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.
Affected products
Apache Software Foundation · Apache HTTP ServerRelated CVEs — Apache HTTP Server
In the same product, most dangerous first.
CVE-2021-40438CRITICALmod_proxy SSRFEPSS 100.0%KEVCVE-2021-41773HIGHPath traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49EPSS 100.0%KEVCVE-2021-42013CRITICALPath Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)EPSS 100.0%KEVCVE-2024-38475CRITICALApache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.EPSS 100.0%KEVCVE-2021-44790—Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlierEPSS 96.8%CVE-2017-9798—CVE-2017-9798EPSS 94.7%