CVE-2020-27486

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: Buffer Overflow. 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 string length provided in the data section of the PRG file. It allocates memory for the string immediately, and then copies the string into the TVM object by using a function similar to strcpy. This copy can exceed the length of the allocated string data and overwrite heap data. A successful exploit would allow a ConnectIQ app store application to escape and perform activities outside the restricted application execution environment.

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-120

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