CVE-2021-30348Public exploit

Firmware reboot via invalid Bluetooth timing accuracy

Published Jan 3, 2022 · Updated Aug 3, 2024

Improper validation in Qualcomm Snapdragon Bluetooth firmware allows adjacent attackers to reboot affected device firmware via malformed LMP timing data. The Bluetooth link-manager path processes an invalid Timing Accuracy message without validating LLM utility-timer availability, causing the firmware to crash and reboot. Exploitation requires Bluetooth proximity and specialized LMP-injection hardware; the demonstrated consequence is a firmware reboot without confidentiality or integrity impact.

CVSS severity6.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper validation in Qualcomm Snapdragon Bluetooth firmware allows adjacent attackers to reboot affected device firmware via malformed LMP timing data. The Bluetooth link-manager path processes an invalid Timing Accuracy message without validating LLM utility-timer availability, causing the firmware to crash and reboot. Exploitation requires Bluetooth proximity and specialized LMP-injection hardware; the demonstrated consequence is a firmware reboot without confidentiality or integrity impact.

The record

CVE
CVE-2021-30348
Published
Jan 3, 2022
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-400, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=APQ8009, APQ8017, APQ8064AU, APQ8096AU, AQT1000, AR8031, AR8035, CSRA6620, CSRA6640, CSRB31024, MDM9250, MDM9607, MDM9628, MDM9640, MDM9650, MSM8996AU, QCA1062, QCA1064, QCA2062, QCA2064, QCA2065, QCA2066, QCA6174A, QCA6175A, QCA6390, QCA6391, QCA6420, QCA6426, QCA6430, QCA6436, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCA9379, QCA9886, QCM2290, QCM4290, QCM6490, QCN7605, QCN7606, QCS2290, QCS405, QCS410, QCS4290, QCS603, QCS605, QCS610, QCS6490, QCX315, QRB5165, QRB5165N, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SC8280XP, SD 675, SD 8CX, SD460, SD480, SD660, SD662, SD665, SD675, SD678, SD690 5G, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD845, SD850, SD855, SD865 5G, SD870, SD888, SD888 5G, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM6225, SM6250, SM6250P, SM6375, SM7250P, SM7315, SM7325P, SM8450, SM8450P, WCD9326, WCD9335, WCD9340, WCD9341, W ...[truncated*]

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=APQ8009, APQ8017, APQ8064AU, APQ8096AU, AQT1000, AR8031, AR8035, CSRA6620, CSRA6640, CSRB31024, MDM9250, MDM9607, MDM9628, MDM9640, MDM9650, MSM8996AU, QCA1062, QCA1064, QCA2062, QCA2064, QCA2065, QCA2066, QCA6174A, QCA6175A, QCA6390, QCA6391, QCA6420, QCA6426, QCA6430, QCA6436, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCA9379, QCA9886, QCM2290, QCM4290, QCM6490, QCN7605, QCN7606, QCS2290, QCS405, QCS410, QCS4290, QCS603, QCS605, QCS610, QCS6490, QCX315, QRB5165, QRB5165N, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SC8280XP, SD 675, SD 8CX, SD460, SD480, SD660, SD662, SD665, SD675, SD678, SD690 5G, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD845, SD850, SD855, SD865 5G, SD870, SD888, SD888 5G, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM6225, SM6250, SM6250P, SM6375, SM7250P, SM7315, SM7325P, SM8450, SM8450P, WCD9326, WCD9335, WCD9340, WCD9341, W ...[truncated*]

Published CVSS scores

6.5Qualcomm, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.3NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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