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    2 vulnerabilities found for ArduinoCore-avr by arduino

    CVE-2025-69209 (GCVE-0-2025-69209)

    Vulnerability from cvelistv5 – Published: 2026-01-21 20:00 – Updated: 2026-01-21 21:28
    VLAI
    Title
    ArduinoCore-avr has Stack-Based Buffer Overflow in WString Float/Double Constructors
    Summary
    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 `decimalPlaces` values to the affected String constructors or concat methods, the `dtostrf` 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 `1.8.7` 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/)
    Severity
    6.9 (Medium)
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
    Assigner
    References
    Impacted products
    Vendor Product Version
    arduino ArduinoCore-avr Affected: < 1.8.7
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2025-69209 (GCVE-0-2025-69209)

    Vulnerability from nvd – Published: 2026-01-21 20:00 – Updated: 2026-01-21 21:28
    VLAI
    Title
    ArduinoCore-avr has Stack-Based Buffer Overflow in WString Float/Double Constructors
    Summary
    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 `decimalPlaces` values to the affected String constructors or concat methods, the `dtostrf` 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 `1.8.7` 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/)
    Severity
    6.9 (Medium)
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
    Assigner
    References
    Impacted products
    Vendor Product Version
    arduino ArduinoCore-avr Affected: < 1.8.7
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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