What’s Vulnerable › Vulnerabilities

CVE-2023-23300

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-05-23 · updated 2026-06-17
• Weakness: CWE-120

Description

The `Toybox.Cryptography.Cipher.initialize` API method in CIQ API version 3.0.0 through 4.1.7 does not validate its parameters, which can result in buffer overflows when copying data. A malicious application could call the API method with specially crafted parameters and hijack the execution of the device's firmware.

Affected products

• Garmin Connect-Iq: from 3.0.0 through 4.1.7

References

• https://developer.garmin.com/connect-iq/api-docs/Toybox/Cryptography/Cipher.html#initialize-instance_function
• https://github.com/anvilsecure/garmin-ciq-app-research/blob/main/advisories/CVE-2023-23300.md
• https://developer.garmin.com/connect-iq/api-docs/Toybox/Cryptography/Cipher.html#initialize-instance_function
• https://github.com/anvilsecure/garmin-ciq-app-research/blob/main/advisories/CVE-2023-23300.md

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