CVE-2021-1979

Buffer overflow via unchecked FTM command payload

Published Nov 12, 2021 · Updated Aug 3, 2024

Out-of-bounds write in Qualcomm Snapdragon firmware allows local users to corrupt memory by supplying a malformed FTM command payload. The FTM diagnostic handler improperly validates command-payload lengths before processing them, permitting a buffer overflow in affected firmware. Local low-privilege access to the device diagnostic interface is required; resulting memory corruption can compromise confidentiality, integrity, and availability.

CVSS severity7.8
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

Out-of-bounds write in Qualcomm Snapdragon firmware allows local users to corrupt memory by supplying a malformed FTM command payload. The FTM diagnostic handler improperly validates command-payload lengths before processing them, permitting a buffer overflow in affected firmware. Local low-privilege access to the device diagnostic interface is required; resulting memory corruption can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2021-1979
Published
Nov 12, 2021
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 2021CVE 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=AQT1000, AR8035, CSRB31024, FSM10055, FSM10056, MDM9150, MDM9250, MDM9650, QCA6174A, QCA6310, QCA6320, QCA6335, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564A, QCA6564AU, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCM6125, QCM6490, QCS410, QCS603, QCS605, QCS610, QCS6125, QCS6490, QCX315, QSM8350, SA415M, SA515M, SA8155, SA8155P, SC8180X+SDX55, SD 455, SD 636, SD 675, SD 8C, SD 8CX, SD480, SD660, SD665, SD670, SD675, SD678, SD690 5G, SD710, SD712, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD835, SD845, SD850, SD855, SD865 5G, SD870, SD888 5G, SDM630, SDX12, SDX20, SDX24, SDX50M, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM6250, SM6250P, SM6375, SM7250, SM7325, SM8450, SM8450P, WCD9326, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9371, WCD9375, WCD9380, WCD9385, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, WCN7850, WCN7851, WHS9 ...[truncated*]

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Qualcomm · Snapdragonversion=AQT1000, AR8035, CSRB31024, FSM10055, FSM10056, MDM9150, MDM9250, MDM9650, QCA6174A, QCA6310, QCA6320, QCA6335, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564A, QCA6564AU, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCM6125, QCM6490, QCS410, QCS603, QCS605, QCS610, QCS6125, QCS6490, QCX315, QSM8350, SA415M, SA515M, SA8155, SA8155P, SC8180X+SDX55, SD 455, SD 636, SD 675, SD 8C, SD 8CX, SD480, SD660, SD665, SD670, SD675, SD678, SD690 5G, SD710, SD712, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD835, SD845, SD850, SD855, SD865 5G, SD870, SD888 5G, SDM630, SDX12, SDX20, SDX24, SDX50M, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM6250, SM6250P, SM6375, SM7250, SM7325, SM8450, SM8450P, WCD9326, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9371, WCD9375, WCD9380, WCD9385, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, WCN7850, WCN7851, WHS9 ...[truncated*]

Published CVSS scores

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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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