CVE-2021-30263

Unspecified impact via concurrent logging-node opens

Published Nov 12, 2021 · Updated Aug 3, 2024

A use-after-free in Qualcomm Snapdragon modem firmware allows local users with high privileges to cause unspecified impact. The On-Device Logging node lacks synchronization when it is opened twice concurrently, creating a race that permits freed memory to be reused. Exploitation requires local high-privilege access; Qualcomm has not disclosed whether the fault permits code execution, data access, or a crash.

CVSS severity6.7
Medium
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

A use-after-free in Qualcomm Snapdragon modem firmware allows local users with high privileges to cause unspecified impact. The On-Device Logging node lacks synchronization when it is opened twice concurrently, creating a race that permits freed memory to be reused. Exploitation requires local high-privilege access; Qualcomm has not disclosed whether the fault permits code execution, data access, or a crash.

The record

CVE
CVE-2021-30263
Published
Nov 12, 2021
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-416
Attack vector
local
Privileges
admin

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, AR8031, AR8035, CSRA6620, CSRA6640, QCA6391, QCA6420, QCA6430, QCA8337, QCM6125, QCS405, QCS6125, SD 8C, SD 8CX, SD855, SDX55, SDX55M, WCD9335, WCD9340, WCD9341, WCD9370, WCN3950, WCN3980, WCN3998, WCN3999, WSA8810, WSA8815

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Qualcomm · Snapdragonversion=AQT1000, AR8031, AR8035, CSRA6620, CSRA6640, QCA6391, QCA6420, QCA6430, QCA8337, QCM6125, QCS405, QCS6125, SD 8C, SD 8CX, SD855, SDX55, SDX55M, WCD9335, WCD9340, WCD9341, WCD9370, WCN3950, WCN3980, WCN3998, WCN3999, WSA8810, WSA8815

Published CVSS scores

6.7Qualcomm, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4NIST NVDAV:L/AC:M/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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