{
  "cveId": "CVE-2025-69209",
  "url": "https://patchblox.com/security/cve/CVE-2025-69209",
  "summary": "CVE-2025-69209 is fixed in arduino-core-avr on 1 platform, first by DEBIAN-CVE-2025-69209, released January 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "arduino-core-avr: ArduinoCore-avr contains the source code and configuration files of the Arduino AVR Boards platform",
  "description": "ArduinoCore-avr contains the source code and configuration files of the Arduino AVR Boards platform. A vulnerability in versions prior to 1.8.7 allows an attacker to trigger a stack-based buffer overflow when converting floating-point values to strings with high precision. By passing very large \u0060decimalPlaces\u0060 values to the affected String constructors or concat methods, the \u0060dtostrf\u0060 function writes beyond fixed-size stack buffers, causing memory corruption and denial of service. Under specific conditions, this could enable arbitrary code execution on AVR-based Arduino boards.  ### Patches  - The Fix is included starting from the \u00601.8.7\u0060 release available from the following link [ArduinoCore-avr v1.8.7](https://github.com/arduino/ArduinoCore-avr)  - The Fixing Commit is available at the following link [1a6a417f89c8901dad646efce74ae9d3ddebfd59](https://github.com/arduino/ArduinoCore-avr/pull/613/commits/1a6a417f89c8901dad646efce74ae9d3ddebfd59)  ### References  - [ASEC-26-001 ArduinoCore-avr vXXXX Resolves Buffer Overflow Vulnerability](https://support.arduino.cc/hc/en-us/articles/XXXXX)  ### Credits  - Maxime Rossi Bellom and Ramtine Tofighi Shirazi from SecMate (https://secmate.dev/)",
  "published": "2026-01-21T20:16:10Z",
  "severity": "",
  "epss": 0.00177,
  "epssPercentile": 0.07276,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "arduino-core-avr",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.8.7\u002Bdfsg-1~deb12u1",
      "fix": "DEBIAN-CVE-2025-69209",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-69209",
      "released": "2026-01-21T20:16:10Z"
    },
    {
      "platform": "linux",
      "product": "arduino-core-avr",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.8.7\u002Bdfsg-1~deb13u1",
      "fix": "DEBIAN-CVE-2025-69209",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-69209",
      "released": "2026-01-21T20:16:10Z"
    },
    {
      "platform": "linux",
      "product": "arduino-core-avr",
      "release": "Debian 14",
      "fixedVersion": "1.8.7\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2025-69209",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-69209",
      "released": "2026-01-21T20:16:10Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}