What’s Vulnerable › Vulnerabilities

CVE-2020-27485

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% 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 fails to check the index provided when accessing the local variable in the LGETV and LPUTV instructions. This provides the ability to both read and write memory outside the bounds of the TVM context allocation. It can be leveraged to construct a use-after-free scenario, leading to a constrained read/write primitive across the entire MAX32630 address space. A successful exploit would allow a ConnectIQ app store application to escape and perform activities outside the restricted application execution environment.

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-2020-0005.md
• https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0005.md

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