CVE-2023-43622

    Dashboard / Vulnerabilities / CVE-2023-43622

    CVE-2023-43622

    Published: 23 Oct 2023Last Modified: 28 Oct 2026

    Summary: Apache HTTP Server: DoS in HTTP/2 with initial windows size 0

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43622.json, https://httpd.apache.org/security/vulnerabilities_24.html, https://nvd.nist.gov/vuln/detail/CVE-2023-43622, https://security.netapp.com/advisory/ntap-20231027-0011/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 8201e867f1d4cdf61840625c6c4be901e3f1b6ba
    Fixed -c3ad18b7ee32da93eabaae7b94541d3c32264340

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High