What’s Vulnerable › Vulnerabilities

CVE-2020-27483

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-16 · updated 2026-06-17
• Weakness: CWE-129

Description

Garmin Forerunner 235 before 8.20 is affected by: Array index error. The component is: ConnectIQ TVM. The attack vector is: To exploit the vulnerability, the attacker must upload a malicious ConnectIQ application to the ConnectIQ store. The ConnectIQ program interpreter trusts the offset provided for the stack value duplication instruction, DUP. The offset is unchecked and memory prior to the start of the execution stack can be read and treated as a TVM object. A successful exploit could use the vulnerability to leak runtime information such as the heap handle or pointer for a number of TVM context variables. Some reachable values may be controlled enough to forge a TVM object on the stack, leading to possible remote code execution.

Affected products

• Garmin Forerunner 235 Firmware: from 7.90 before 8.20 — fixed in 8.20

How to fix

Upgrade to a fixed version: Garmin Forerunner 235 Firmware 8.20. Check the vendor advisory for mitigations.

References

• https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0007.md
• https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0007.md

Get alerted when CVE-2020-27483 or the next vulnerability affects your stack