CVE-2020-11284

Boot-chain compromise via improper locked-memory handling

Published May 7, 2021 · Updated Aug 4, 2024

Improper locking in Qualcomm Snapdragon QTEE allows local attackers to corrupt protected memory through a non-secure boot loader. An improper system-call sequence lets the non-secure boot loader unlock and alter memory that the secure boot loader had locked, causing trusted boot code to consume attacker-controlled data. Access to the local boot chain is required, and successful exploitation can compromise confidentiality, integrity, and device availability.

CVSS severity8.4
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Qualcomm Snapdragon QTEE allows local attackers to corrupt protected memory through a non-secure boot loader. An improper system-call sequence lets the non-secure boot loader unlock and alter memory that the secure boot loader had locked, causing trusted boot code to consume attacker-controlled data. Access to the local boot chain is required, and successful exploitation can compromise confidentiality, integrity, and device availability.

The record

CVE
CVE-2020-11284
Published
May 7, 2021
Updated
Aug 4, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-667
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=AQT1000, AR8035, PM3003A, PM4125, PM4250, PM6125, PM6150, PM6150A, PM6150L, PM6350, PM640A, PM640L, PM640P, PM7250B, PM8004, PM8005, PM8008, PM8009, PM8150A, PM8150B, PM8150C, PM8150L, PM8250, PM8350, PM855, PM855B, PM855L, PM855P, PM8998, PMD9655, PMI632, PMI8998, PMK8002, PMK8003, PMM8195AU, PMM855AU, PMR525, PMX24, PMX55, QAT3522, QAT3550, QBT1500, QBT2000, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6574AU, QCA6595, QCA9984, QCM2290, QCM4290, QCS2290, QCS405, QCS4290, QET4101, QET5100, QET6100, QET6105, QFS2530, QFS2580, QPA4360, QPA5460, QPA6560, QSW8574, QTC410S, QTC800H, QTC800S, QTC801S, QTM525, SA6155P, SA8195P, SD 8C, SD 8CX, SD460, SD480, SD662, SD675, SD855, SD865 5G, SD870, SD888 5G, SDM830, SDR425, SDR660, SDR660G, SDR735, SDR735G, SDR8150, SDR8250, SDR865, SDX24, SDX55, SDX55M, SDXR2 5G, SM4125, SMB1351, SMB1354, SMB1355, SMB1390, SMB1396, SMR525, SMR526, SMR545, SMR546, WCD9340, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3910, WCN395 ...[truncated*]

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=AQT1000, AR8035, PM3003A, PM4125, PM4250, PM6125, PM6150, PM6150A, PM6150L, PM6350, PM640A, PM640L, PM640P, PM7250B, PM8004, PM8005, PM8008, PM8009, PM8150A, PM8150B, PM8150C, PM8150L, PM8250, PM8350, PM855, PM855B, PM855L, PM855P, PM8998, PMD9655, PMI632, PMI8998, PMK8002, PMK8003, PMM8195AU, PMM855AU, PMR525, PMX24, PMX55, QAT3522, QAT3550, QBT1500, QBT2000, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6574AU, QCA6595, QCA9984, QCM2290, QCM4290, QCS2290, QCS405, QCS4290, QET4101, QET5100, QET6100, QET6105, QFS2530, QFS2580, QPA4360, QPA5460, QPA6560, QSW8574, QTC410S, QTC800H, QTC800S, QTC801S, QTM525, SA6155P, SA8195P, SD 8C, SD 8CX, SD460, SD480, SD662, SD675, SD855, SD865 5G, SD870, SD888 5G, SDM830, SDR425, SDR660, SDR660G, SDR735, SDR735G, SDR8150, SDR8250, SDR865, SDX24, SDX55, SDX55M, SDXR2 5G, SM4125, SMB1351, SMB1354, SMB1355, SMB1390, SMB1396, SMR525, SMR526, SMR545, SMR546, WCD9340, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3910, WCN395 ...[truncated*]

Published CVSS scores

7.2NISTAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4Qualcomm, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking

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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