CVE-2023-21635

Local memory corruption via unchecked buffer copy

Published Jul 4, 2023 · Updated Aug 2, 2024

Memory corruption in Qualcomm Snapdragon Data Network Stack and Connectivity firmware allows local users to corrupt memory during SIM detection. The component copies telephony response data without checking the destination buffer size when processing SIM detection. Exploitation requires high local privileges and no user interaction; successful corruption can compromise data and interrupt the device.

CVSS severity6.7

Medium

EPSS probability0.11%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

Coverage for this vulnerability

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Summary

What happened

The record

CVE: CVE-2023-21635
Published: Jul 4, 2023
Updated: Aug 2, 2024

Vendor: Qualcomm
Product: SA8155P Firmware
Classifications: CWE-120

Attack vector: local
Privileges: admin

Timeline

How it unfolded

Jul 4, 2023CVE publishedPublication date reported by the CVE source.
Aug 2, 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.

Affected versionversion=-

What conditions does exploitation require?

Attack vectorlocal

Required privilegesadmin

What is affected?

Qualcomm · SA8155P Firmwareversion=-

Qualcomm · Qualcomm WCN3660B Firmwareversion=-

Qualcomm · SW5100 Firmwareversion=-

Qualcomm · SW5100P Firmwareversion=-

Qualcomm · Qualcomm QCA6595AU Firmwareversion=-

Qualcomm · Qualcomm QCA6564 Firmwareversion=-

Qualcomm · CSRB31024 Firmwareversion=-

Qualcomm · Snapdragon Auto 4G Modem Firmwareversion=-

Qualcomm · WSA8810 Firmwareversion=-

Qualcomm · Qualcomm QCA6426 Firmwareversion=-

Qualcomm · SA6150P Firmwareversion=-

Qualcomm · WCN3680B Firmwareversion=-

Qualcomm · SA8195P Firmwareversion=-

Qualcomm · Snapdragonversion=AQT1000; version=CSRB31024; version=FastConnect 6200; version=FastConnect 6800; version=FastConnect 6900; version=QCA6391; version=QCA6420; version=QCA6426; version=QCA6430; version=QCA6436; version=QCA6564; version=QCA6564AU; version=QCA6574A; version=QCA6574AU; version=QCA6595AU; version=QCA6696; version=SA6145P; version=SA6150P; version=SA6155P; version=SA8145P; version=SA8150P; version=SA8155P; version=SA8195P; version=SD855; version=SD865 5G; version=Snapdragon 855+/860 Mobile Platform (SM8150-AC); version=Snapdragon 855 Mobile Platform; version=Snapdragon 865 5G Mobile Platform; version=Snapdragon 865+ 5G Mobile Platform (SM8250-AB); version=Snapdragon 870 5G Mobile Platform (SM8250-AC); version=Snapdragon Auto 4G Modem; version=Snapdragon W5+ Gen 1 Wearable Platform; version=Snapdragon Wear 4100+ Platform; version=Snapdragon X55 5G Modem-RF System; version=Snapdragon XR2 5G Platform; version=SW5100; version=SW5100P; version=SXR2130; version=WCD9341; version=WCD9380; version=WCN3610; version=WCN3660B; version=WCN3680B; version=WCN3980; version=WCN3988; version=WSA8810; version=WSA8815; version=WSA8830; version=WSA8835

Qualcomm · SA6155P Firmwareversion=-

Qualcomm · Qualcomm Snapdragon 865 5G Mobile Platform Firmwareversion=-

Qualcomm · Qualcomm SD855 Firmwareversion=-

Qualcomm · SA8145P Firmwareversion=-

Qualcomm · FastConnect 6900 Firmwareversion=-

Qualcomm · SA8150P Firmwareversion=-

Qualcomm · QCA6420 Firmwareversion=-

Qualcomm · Qualcomm WCD9341 Firmwareversion=-

Qualcomm · Snapdragon X55 5G Modem-RF System Firmwareversion=-

Qualcomm · Qualcomm QCA6564AU Firmwareversion=-

Qualcomm · WCN3988 Firmwareversion=-

Qualcomm · Qualcomm Snapdragon 855 Mobile Platform Firmwareversion=-

Qualcomm · Qualcomm QCA6436 Firmwareversion=-

Qualcomm · QCA6574AU Firmwareversion=-

Qualcomm · WCD9380 Firmwareversion=-

Qualcomm · Qualcomm QCA6574A Firmwareversion=-

Qualcomm · Qualcomm QCA6430 Firmwareversion=-

Qualcomm · SA6145P Firmwareversion=-

Qualcomm · Qualcomm SD865 5G Firmwareversion=-

Qualcomm · Qualcomm WCN3610 Firmwareversion=-

Qualcomm · FastConnect 6200 Firmwareversion=-

Qualcomm · AQT1000 Firmwareversion=-

Qualcomm · WSA8830 Firmwareversion=-

Qualcomm · QCA6391 Firmwareversion=-

Qualcomm · Qualcomm Snapdragon XR2 5G Platform Firmwareversion=-

Qualcomm · WCN3980 Firmwareversion=-

Qualcomm · WSA8835 Firmwareversion=-

Qualcomm · FastConnect 6800 Firmwareversion=-

Qualcomm · SXR2130 Firmwareversion=-

Qualcomm · QCA6696 Firmwareversion=-

Qualcomm · WSA8815 Firmwareversion=-

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

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 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.

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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