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CVE Record

CVE-2020-27484: Garmin Forerunner 235 before 8.20 is affected by: Integer Overflow.

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.

UnknownCVSS not scoredNot KEV-listedUpdated
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-27484 affects Garmin Forerunner 235 watches before firmware 8.20. A malicious ConnectIQ app could break out of the intended app sandbox. Business urgency is mainly for organizations that issue or manage these devices, especially where wearable data sensitivity matters.

Executive priority

Treat this as a targeted wearable risk, not a broad enterprise emergency. Prioritize if the organization manages Garmin Forerunner 235 devices or permits wearable apps in sensitive environments.

Technical view

The issue is an integer overflow in the ConnectIQ TVM interpreter. The NEWA instruction allocation path fails to check overflow, creating a constrained read/write primitive across the MAX32630 address space and enabling ConnectIQ sandbox escape.

Likely exposure

Exposure appears limited to Garmin Forerunner 235 devices running firmware before 8.20 with ConnectIQ app capability. The provided sources do not identify broader affected products or enterprise platforms.

Exploitation context

The stated attack path requires a malicious ConnectIQ application to be uploaded to the ConnectIQ store. CISA KEV status is false in the bundle, and no cited source confirms active exploitation.

Researcher notes

The public bundle lacks CVSS, CWE mapping, and detailed vendor remediation text. Analysis should stay scoped to Forerunner 235 before 8.20 and the ConnectIQ TVM NEWA overflow described by the advisory.

Mitigation direction

  • Inventory Garmin Forerunner 235 devices and firmware versions.
  • Update affected devices to firmware 8.20 or later where available.
  • Remove unnecessary or untrusted ConnectIQ applications from managed devices.
  • Check Garmin guidance for any device-specific remediation details.
  • Limit use of ConnectIQ apps on sensitive or managed wearables.

Validation and detection

  • Confirm each Forerunner 235 reports firmware 8.20 or later.
  • Review managed devices for installed ConnectIQ applications.
  • Verify procurement or MDM records for remaining Forerunner 235 use.
  • Monitor vendor advisories for any expanded affected-product information.
Prepared
Confidence
medium
Sources
3

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2020-27484 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.