How severe is CVE-2021-31613?

CVE-2021-31613 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-31613 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31613?

CVE-2021-31613 primarily affects Zh-jieli Ac6901 Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-31613?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-31613 published?

CVE-2021-31613 was published on 2021-09-07 and last updated on 2026-06-17.

CVE-2021-31613

CVE-2021-31613 is a medium-severity vulnerability in Zh-jieli Ac6901 Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 3.3
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zh-jieli Ac6901 Firmware
Published: 2021-09-07
Last modified: 2026-06-17

Description

The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle the reception of a truncated LMP packet during the LMP auto rate procedure, allowing attackers in radio range to immediately crash (and restart) a device via a crafted LMP packet.

Frequently asked questions

What is CVE-2021-31613?: The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle the reception of a truncated LMP packet during the LMP auto rate procedure, allowing attackers in radio range to immediately crash (and restart) a device via a crafted LMP packet.
How severe is CVE-2021-31613?: CVE-2021-31613 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-31613 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31613?: CVE-2021-31613 primarily affects Zh-jieli Ac6901 Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-31613?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-31613 published?: CVE-2021-31613 was published on 2021-09-07 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:o:zh-jieli:ac6901_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zh-jieli:ac6925_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zh-jieli:ac6926_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zh-jieli:ac6928_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zh-jieli:ac6921_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Zh-jieli Ac6901 Firmware

CVE-2021-31612 — Medium (CVSS 6.5): The Bluetooth Classic implementation on Zhuhai Jieli AC690X devices does not properly handle the reception of an…
CVE-2021-31611 — Medium (CVSS 5.7): The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle an out-of-order…

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