CVE-2021-30308

Memory corruption via unchecked HARQ detail printing

Published Jan 13, 2022 · Updated Aug 3, 2024

Buffer overflow in Qualcomm Snapdragon modem RFA firmware allows local users to corrupt memory during HARQ detail printing. The diagnostic-printing path fails to validate the destination buffer size before copying HARQ memory-partition details, permitting a write beyond the buffer. Exploitation requires low-privileged local access and no user interaction; Qualcomm does not disclose whether the overflow causes a crash, code execution, or another concrete outcome.

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

Buffer overflow in Qualcomm Snapdragon modem RFA firmware allows local users to corrupt memory during HARQ detail printing. The diagnostic-printing path fails to validate the destination buffer size before copying HARQ memory-partition details, permitting a write beyond the buffer. Exploitation requires low-privileged local access and no user interaction; Qualcomm does not disclose whether the overflow causes a crash, code execution, or another concrete outcome.

The record

CVE
CVE-2021-30308
Published
Jan 13, 2022
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-120
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 13, 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=AQT1000, AR8035, CSRB31024, FSM10056, MDM9150, MDM9250, MDM9650, QCA6174A, QCA6390, QCA6391, QCA6420, QCA6426, QCA6430, QCA6436, QCA6564A, QCA6564AU, QCA6574A, QCA6574AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCS410, QCS603, QCS605, QCS610, QCX315, SA415M, SA515M, SD 675, SD 8 Gen1 5G, SD 8cx Gen2, SD480, SD660, SD665, SD675, SD678, SD690 5G, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD7c, SD845, SD850, SD855, SD865 5G, SD870, SDX12, SDX20, SDX24, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM6250, SM6250P, SM6375, SM7250P, WCD9326, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6850, WCN6851, WCN6855, WCN6856, WSA8810, WSA8815, WSA8830, WSA8835

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Qualcomm · Snapdragonversion=AQT1000, AR8035, CSRB31024, FSM10056, MDM9150, MDM9250, MDM9650, QCA6174A, QCA6390, QCA6391, QCA6420, QCA6426, QCA6430, QCA6436, QCA6564A, QCA6564AU, QCA6574A, QCA6574AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCS410, QCS603, QCS605, QCS610, QCX315, SA415M, SA515M, SD 675, SD 8 Gen1 5G, SD 8cx Gen2, SD480, SD660, SD665, SD675, SD678, SD690 5G, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD7c, SD845, SD850, SD855, SD865 5G, SD870, SDX12, SDX20, SDX24, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM6250, SM6250P, SM6375, SM7250P, WCD9326, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6850, WCN6851, WCN6855, WCN6856, WSA8810, WSA8815, WSA8830, WSA8835

Published CVSS scores

7.8QualcommCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NVDAV: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

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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.

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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