{
  "cveId": "CVE-2022-2053",
  "url": "https://patchblox.com/security/cve/CVE-2022-2053",
  "summary": "CVE-2022-2053 is fixed in undertow on 1 platform by DEBIAN-CVE-2022-2053 (version 2.2.18-1), released August 5, 2022. It is not reported as exploited. Patch Radar priority: High.",
  "title": "undertow: When a POST request comes through AJP and the request exceeds the max-post-size limit (maxEntitySize), Undertow\u0027s Ajp...",
  "description": "When a POST request comes through AJP and the request exceeds the max-post-size limit (maxEntitySize), Undertow\u0027s AjpServerRequestConduit implementation closes a connection without sending any response to the client/proxy. This behavior results in that a front-end proxy marking the backend worker (application server) as an error state and not forward requests to the worker for a while. In mod_cluster, this continues until the next STATUS request (10 seconds intervals) from the application server updates the server state. So, in the worst case, it can result in \u0022All workers are in error state\u0022 and mod_cluster responds \u0022503 Service Unavailable\u0022 for a while (up to 10 seconds). In mod_proxy_balancer, it does not forward requests to the worker until the \u0022retry\u0022 timeout passes. However, luckily, mod_proxy_balancer has \u0022forcerecovery\u0022 setting (On by default; this parameter can force the immediate recovery of all workers without considering the retry parameter of the workers if all workers of a balancer are in error state.). So, unlike mod_cluster, mod_proxy_balancer does not result in responding \u0022503 Service Unavailable\u0022. An attacker could use this behavior to send a malicious request and trigger server errors, resulting in DoS (denial of service). This flaw was fixed in Undertow 2.2.19.Final, Undertow 2.3.0.Alpha2.",
  "published": "2022-08-05T16:15:11Z",
  "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": 0.01093,
  "epssPercentile": 0.65643,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "undertow",
      "release": "Debian 14",
      "fixedVersion": "2.2.18-1",
      "fix": "DEBIAN-CVE-2022-2053",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-2053",
      "released": "2022-08-05T16:15:11Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}