CVE-2021-30323

Local memory corruption via oversized EFS write

Published Feb 11, 2022 · Updated Aug 3, 2024

Buffer overflow in the modem EFS component of Qualcomm Snapdragon chipsets allows local users to corrupt memory through an oversized file write. The modem EFS write path accepts a requested data length without properly enforcing the maximum write size before operating on the file data. Low-privileged local access is required, and successful corruption can expose or alter data or interrupt the affected device.

CVSS severity7.8
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

Buffer overflow in the modem EFS component of Qualcomm Snapdragon chipsets allows local users to corrupt memory through an oversized file write. The modem EFS write path accepts a requested data length without properly enforcing the maximum write size before operating on the file data. Low-privileged local access is required, and successful corruption can expose or alter data or interrupt the affected device.

The record

CVE
CVE-2021-30323
Published
Feb 11, 2022
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-120
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 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

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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=APQ8009W, APQ8017, APQ8053, APQ8096AU, AQT1000, CSRB31024, MDM8207, MDM9150, MDM9205, MDM9206, MDM9207, MDM9250, MDM9607, MDM9628, MDM9640, MDM9650, MDM9655, MSM8909W, MSM8953, MSM8996AU, QCA4004, QCA6174A, QCA6420, QCA6430, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA9367, QCA9377, QCM2290, QCM4290, QCM6125, QCS2290, QCS410, QCS4290, QCS610, QCS6125, QET4101, QSW8573, Qualcomm215, SA415M, SA6145P, SA6150P, SA6155P, SA8145P, SA8150P, SA8155P, SA8195P, SD 675, SD 8cx Gen2, SD205, SD210, SD429, SD439, SD660, SD665, SD675, SD678, SD720G, SD730, SD7c, SD845, SD850, SD855, SDA429W, SDM429W, SDW2500, SDX12, SDX20, SDX24, SDXR1, SM6250, SM6250P, WCD9306, WCD9326, WCD9330, WCD9335, WCD9340, WCD9341, WCD9370, WCD9375, WCD9380, WCN3610, WCN3615, WCN3620, WCN3660B, WCN3680B, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WSA8810, WSA8815

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Qualcomm · Snapdragonversion=APQ8009W, APQ8017, APQ8053, APQ8096AU, AQT1000, CSRB31024, MDM8207, MDM9150, MDM9205, MDM9206, MDM9207, MDM9250, MDM9607, MDM9628, MDM9640, MDM9650, MDM9655, MSM8909W, MSM8953, MSM8996AU, QCA4004, QCA6174A, QCA6420, QCA6430, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA9367, QCA9377, QCM2290, QCM4290, QCM6125, QCS2290, QCS410, QCS4290, QCS610, QCS6125, QET4101, QSW8573, Qualcomm215, SA415M, SA6145P, SA6150P, SA6155P, SA8145P, SA8150P, SA8155P, SA8195P, SD 675, SD 8cx Gen2, SD205, SD210, SD429, SD439, SD660, SD665, SD675, SD678, SD720G, SD730, SD7c, SD845, SD850, SD855, SDA429W, SDM429W, SDW2500, SDX12, SDX20, SDX24, SDXR1, SM6250, SM6250P, WCD9306, WCD9326, WCD9330, WCD9335, WCD9340, WCD9341, WCD9370, WCD9375, WCD9380, WCN3610, WCN3615, WCN3620, WCN3660B, WCN3680B, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WSA8810, WSA8815

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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