CVE-2021-30271

Service interruption via unchecked thread identifier dereference

Published Jan 3, 2022 · Updated Aug 3, 2024

NULL pointer dereference in Qualcomm Snapdragon chipsets allows local users to interrupt service and disclose or alter limited data. The kernel trap handler dereferences a thread identifier without first validating that it resolves to a valid thread object. Exploitation requires local code execution on a device containing an affected chipset; Qualcomm has not disclosed the trap interface or resulting failure mode.

CVSS severity7.3
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Qualcomm Snapdragon chipsets allows local users to interrupt service and disclose or alter limited data. The kernel trap handler dereferences a thread identifier without first validating that it resolves to a valid thread object. Exploitation requires local code execution on a device containing an affected chipset; Qualcomm has not disclosed the trap interface or resulting failure mode.

The record

CVE
CVE-2021-30271
Published
Jan 3, 2022
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-476
Attack vector
local
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=APQ8009W, APQ8017, APQ8096AU, AR8031, AR8035, CSR8811, CSRA6620, CSRA6640, CSRB31024, FSM10055, FSM10056, IPQ5010, IPQ5018, IPQ5028, IPQ6010, IPQ6018, IPQ6028, IPQ8070A, IPQ8071A, IPQ8072A, IPQ8074A, IPQ8076, IPQ8076A, IPQ8078, IPQ8078A, IPQ8173, IPQ8174, MDM8207, MDM9150, MDM9205, MDM9206, MDM9207, MDM9250, MDM9607, MDM9628, MDM9635M, MDM9640, MDM9645, MDM9650, MDM9655, MSM8909W, MSM8996AU, QCA2062, QCA2064, QCA2065, QCA2066, QCA4004, QCA4024, QCA6174A, QCA6390, QCA6391, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6584AU, QCA6595AU, QCA6696, QCA8075, QCA8081, QCA8337, QCA9367, QCA9377, QCA9888, QCA9889, QCA9984, QCN5022, QCN5024, QCN5052, QCN5122, QCN5124, QCN5152, QCN5154, QCN5164, QCN6023, QCN6024, QCN6122, QCN6132, QCN7605, QCN7606, QCN9022, QCN9024, QCN9070, QCN9072, QCN9074, QCS405, QCS410, QCS603, QCS605, QCS610, QCX315, QSW8573, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SC8280XP, SD 675, SD 8CX, SD205, SD2 ...[truncated*]

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=APQ8009W, APQ8017, APQ8096AU, AR8031, AR8035, CSR8811, CSRA6620, CSRA6640, CSRB31024, FSM10055, FSM10056, IPQ5010, IPQ5018, IPQ5028, IPQ6010, IPQ6018, IPQ6028, IPQ8070A, IPQ8071A, IPQ8072A, IPQ8074A, IPQ8076, IPQ8076A, IPQ8078, IPQ8078A, IPQ8173, IPQ8174, MDM8207, MDM9150, MDM9205, MDM9206, MDM9207, MDM9250, MDM9607, MDM9628, MDM9635M, MDM9640, MDM9645, MDM9650, MDM9655, MSM8909W, MSM8996AU, QCA2062, QCA2064, QCA2065, QCA2066, QCA4004, QCA4024, QCA6174A, QCA6390, QCA6391, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6584AU, QCA6595AU, QCA6696, QCA8075, QCA8081, QCA8337, QCA9367, QCA9377, QCA9888, QCA9889, QCA9984, QCN5022, QCN5024, QCN5052, QCN5122, QCN5124, QCN5152, QCN5154, QCN5164, QCN6023, QCN6024, QCN6122, QCN6132, QCN7605, QCN7606, QCN9022, QCN9024, QCN9070, QCN9072, QCN9074, QCS405, QCS410, QCS603, QCS605, QCS610, QCX315, QSW8573, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SC8280XP, SD 675, SD 8CX, SD205, SD2 ...[truncated*]

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3Qualcomm, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

Public exploit references

No public exploit references are available in this record.

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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