CVE-2020-27483

CRITICAL
9.9
CVSS Score
Published: November 16, 2020 at 08:59 PM UTC
Updated: June 17, 2026 at 03:09 AM UTC
2 products affected across 1 vendorForerunner 235 FirmwareForerunner 235

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Severity
CRITICAL9.9
Exploit prediction
EPSS 2%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

7.90 ≤ v < 8.20
Affected range stops below 8.20, so it looks safe — our inference, not a vendor statement
garmin-forerunner-235 (same device)
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-129

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