How severe is CVE-2023-23306?

CVE-2023-23306 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-23306 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-23306?

CVE-2023-23306 affects Garmin Connect-iq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-23306?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-23306 published?

CVE-2023-23306 was published on 2023-05-23 and last updated on 2026-06-17.

CVE-2023-23306

CVE-2023-23306 is a critical-severity vulnerability in Garmin Connect-iq with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Garmin Connect-iq
Published: 2023-05-23
Last modified: 2026-06-17

Description

The `Toybox.Ant.BurstPayload.add` API method in CIQ API version 2.2.0 through 4.1.7 suffers from a type confusion vulnreability, which can result in an out-of-bounds write operation. A malicious application could create a specially crafted `Toybox.Ant.BurstPayload` object, call its `add` method, override arbitrary memory and hijack the execution of the device's firmware.

Frequently asked questions

What is CVE-2023-23306?: The `Toybox.Ant.BurstPayload.add` API method in CIQ API version 2.2.0 through 4.1.7 suffers from a type confusion vulnreability, which can result in an out-of-bounds write operation. A malicious application could create a specially crafted `Toybox.Ant.BurstPayload` object, call its `add` method, override arbitrary memory and hijack the execution of the device's firmware.
How severe is CVE-2023-23306?: CVE-2023-23306 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-23306 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-23306?: CVE-2023-23306 affects Garmin Connect-iq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-23306?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-23306 published?: CVE-2023-23306 was published on 2023-05-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:garmin:connect-iq:*:*:*:*:*:*:*:*

More vulnerabilities in Garmin Connect-iq

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