{
  "cveId": "CVE-2021-42553",
  "url": "https://patchblox.com/security/cve/CVE-2021-42553",
  "summary": "CVE-2021-42553 is fixed in micropython on 1 platform, first by micropython 1.12-1ubuntu0.1~esm1, released September 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "micropython: A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronicsin versions before 3.5.1 allows an attacker...",
  "description": "A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronicsin versions before 3.5.1 allows an attacker to execute arbitrary code whenthe descriptor contains more endpoints than USBH_MAX_NUM_ENDPOINTS. Thelibrary is typically integrated when using a RTOS such as FreeRTOS on STM32MCUs.",
  "published": "2022-10-21T03:15:00Z",
  "severity": "Medium",
  "epss": 0.01304,
  "epssPercentile": 0.70684,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "micropython",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.12-1ubuntu0.1~esm1",
      "fix": "micropython 1.12-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-micropython-1.12-1ubuntu0.1-esm1",
      "released": "2024-09-17T12:15:00Z"
    },
    {
      "platform": "linux",
      "product": "micropython",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.17\u002Bds-1.1ubuntu2\u002Besm1",
      "fix": "micropython 1.17\u002Bds-1.1ubuntu2\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-micropython-1.17-ds-1.1ubuntu2-esm1",
      "released": "2024-09-17T12:15:00Z"
    },
    {
      "platform": "linux",
      "product": "micropython",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.22.1\u002Bds-1ubuntu0.24.04.1~esm1",
      "fix": "micropython 1.22.1\u002Bds-1ubuntu0.24.04.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-micropython-1.22.1-ds-1ubuntu0.24.04.1-esm1",
      "released": "2024-09-17T12:15:00Z"
    },
    {
      "platform": "linux",
      "product": "micropython",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "1.22.1\u002Bds-1ubuntu0.24.10.1",
      "fix": "micropython 1.22.1\u002Bds-1ubuntu0.24.10.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-micropython-1.22.1-ds-1ubuntu0.24.10.1",
      "released": "2026-01-16T01:42:22Z"
    }
  ],
  "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"
  }
}