CVE-2021-30298

Out-of-bounds access via unchecked DIAG item size

Published Jan 3, 2022 · Updated Aug 3, 2024

Buffer overflow in Qualcomm Snapdragon DIAG Services allows local users with high privileges to access memory outside allocated bounds. The DIAG path fails to validate an item's size and memory-pool data while switching between USB and PCIe, permitting out-of-bounds access. High local privileges and no user interaction are required; Qualcomm has not disclosed whether the access reads, writes, or both.

CVSS severity6.7
Medium
EPSS probability0.14%
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 Qualcomm Snapdragon DIAG Services allows local users with high privileges to access memory outside allocated bounds. The DIAG path fails to validate an item's size and memory-pool data while switching between USB and PCIe, permitting out-of-bounds access. High local privileges and no user interaction are required; Qualcomm has not disclosed whether the access reads, writes, or both.

The record

CVE
CVE-2021-30298
Published
Jan 3, 2022
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-120
Attack vector
local
Privileges
admin

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

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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=AR8031, AR8035, CSRA6620, CSRA6640, FSM10055, FSM10056, IPQ8072A, IPQ8074A, IPQ8076A, MDM9150, QCA6390, QCA6391, QCA6574AU, QCA6595AU, QCA6696, QCA8337, QCN9000, QCN9074, QCS405, QCS410, QCS610, QRB5165, QRB5165N, Qualcomm215, SA8155P, SD205, SD210, SD460, SD662, SD665, SD765, SD765G, SD768G, SD865 5G, SD870, SDA429W, SDX55, SDX55M, SM7250P, WCD9335, WCD9340, WCD9341, WCD9370, WCD9375, WCD9380, WCD9385, WCN3610, WCN3620, WCN3660B, WCN3950, WCN3980, WCN3988, WCN3991, WCN3998, WCN3999, WCN6850, WCN6851, WSA8810, WSA8815, WSA8830, WSA8835

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Qualcomm · Snapdragonversion=AR8031, AR8035, CSRA6620, CSRA6640, FSM10055, FSM10056, IPQ8072A, IPQ8074A, IPQ8076A, MDM9150, QCA6390, QCA6391, QCA6574AU, QCA6595AU, QCA6696, QCA8337, QCN9000, QCN9074, QCS405, QCS410, QCS610, QRB5165, QRB5165N, Qualcomm215, SA8155P, SD205, SD210, SD460, SD662, SD665, SD765, SD765G, SD768G, SD865 5G, SD870, SDA429W, SDX55, SDX55M, SM7250P, WCD9335, WCD9340, WCD9341, WCD9370, WCD9375, WCD9380, WCD9385, WCN3610, WCN3620, WCN3660B, WCN3950, WCN3980, WCN3988, WCN3991, WCN3998, WCN3999, WCN6850, WCN6851, WSA8810, WSA8815, WSA8830, WSA8835

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.7Qualcomm, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/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)
Vectorlocal
Privilegesadmin
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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