PT-2026-3858 · Arduino · Arduinocore-Avr
CVE-2025-69209
·
Published
2025-01-01
·
Updated
2026-01-21
CVSS v4.0
6.9
Medium
| Vector | AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Name of the Vulnerable Software and Affected Versions
ArduinoCore-avr versions prior to 1.8.7
Description
ArduinoCore-avr, which contains the source code and configuration files of the Arduino AVR Boards platform, is affected by a stack-based buffer overflow. This occurs when converting floating-point values to strings with high precision. Passing large
decimalPlaces values to the affected String constructors or concat methods causes the dtostrf function to write beyond fixed-size stack buffers, leading to memory corruption and denial of service. Under certain conditions, this could potentially allow for arbitrary code execution on AVR-based Arduino boards.Recommendations
Versions prior to 1.8.7 should be updated to version 1.8.7 or later.
Exploit
Fix
Buffer Overflow
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Weakness Enumeration
Related Identifiers
Affected Products
Arduinocore-Avr