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TI-2020-16677 Aliases CVE-2020-27484GHSA-q449-r33x-v693

Garmin Forerunner 235 before 8.20 is affected by: Integer Overflow.

Priority MEDIUM 46CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

Summary

Garmin Forerunner 235 before 8.20 is affected by: Integer 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 fails to check for overflow when allocating the array for the NEWA instruction. This 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.

Why it matters now

EPSS 0.01767 78th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:garmin:forerunner_235_firmware:*:*:*:*:*:*:*:*7.90 to before 8.20VulnerableGarmin
cpe:2.3:h:garmin:forerunner_235:-:*:*:*:*:*:*:*not specified by NVDRunning onGarmin
  • cpe:2.3:o:garmin:forerunner_235_firmware:*:*:*:*:*:*:*:* Versions 7.90 to before 8.20 Vulnerable ·Garmin
  • cpe:2.3:h:garmin:forerunner_235:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Garmin

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27484
  2. 2026-10-03 Alias added: GHSA-q449-r33x-v693

References

Exploit 1

  • TI-2020-16676 Garmin Forerunner 235 before 8.20 is affected by: Array index error. CVSS 3.1CRITICAL 9.9
  • TI-2020-16679 Garmin Forerunner 235 before 8.20 is affected by: Buffer Overflow. CVSS 3.1CRITICAL 9.9
  • TI-2020-16678 Garmin Forerunner 235 before 8.20 is affected by: Array index error. CVSS 3.1CRITICAL 9.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences