{
  "cveId": "CVE-2023-43622",
  "url": "https://patchblox.com/security/cve/CVE-2023-43622",
  "summary": "CVE-2023-43622 is fixed in 22 products on 1 platform, first by DEBIAN-CVE-2023-43622, released October 23, 2023. It is not reported as exploited. Patch Radar priority: High.",
  "title": "apache2: An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connect...",
  "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 \u0022slow loris\u0022 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.",
  "published": "2023-10-23T07:15:11Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.68818,
  "epssPercentile": 0.9935,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "apache2",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.4.59-1~deb12u1",
      "fix": "DEBIAN-CVE-2023-43622",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-43622",
      "released": "2023-10-23T07:15:11Z"
    },
    {
      "platform": "linux",
      "product": "apache2",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.4.58-1",
      "fix": "DEBIAN-CVE-2023-43622",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-43622",
      "released": "2023-10-23T07:15:11Z"
    },
    {
      "platform": "linux",
      "product": "apache2",
      "release": "Debian 14",
      "fixedVersion": "2.4.58-1",
      "fix": "DEBIAN-CVE-2023-43622",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-43622",
      "released": "2023-10-23T07:15:11Z"
    },
    {
      "platform": "linux",
      "product": "httpd",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-core",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-core-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-devel",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-filesystem",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-manual",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-tools",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "httpd-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_http2",
      "release": "RHEL 9",
      "fixedVersion": "0:2.0.26-1.el9",
      "fix": "RHSA-2024:2368",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2024-2368",
      "released": "2024-04-30T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_http2",
      "release": "almalinux 9",
      "fixedVersion": "2.0.26-1.el9",
      "fix": "ALSA-2024:2368",
      "url": "https://patchblox.com/security/fix/linux/alsa-2024-2368",
      "released": "2024-04-30T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_http2",
      "release": "ol 9",
      "fixedVersion": "0:2.0.26-1.el9",
      "fix": "ELSA-2024-2368",
      "url": "https://patchblox.com/security/fix/linux/elsa-2024-2368",
      "released": "2024-05-02T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_ldap",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_ldap-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_lua",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_lua-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_proxy_html",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_proxy_html-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_session",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_session-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_ssl",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_ssl-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.58-1.amzn2023",
      "fix": "ALAS2023-2023-433",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-433",
      "released": "2023-11-09T21:29:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}