CVE-2021-30342Network attack vector

Unspecified impact via PDCP-RRC integrity race

Published Jun 14, 2022 · Updated Aug 3, 2024

A TOCTOU race in Qualcomm Snapdragon modem PDCP and RRC tasks allows remote attackers to cause unspecified impact after a valid RRC command. The modem performs an improper integrity check between the PDCP and RRC tasks immediately after accepting that command, permitting their state to diverge. Network access and a valid RRC command are required; Qualcomm has not disclosed which modem data or operations become exposed or altered by the race.

CVSS severity9.1
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A TOCTOU race in Qualcomm Snapdragon modem PDCP and RRC tasks allows remote attackers to cause unspecified impact after a valid RRC command. The modem performs an improper integrity check between the PDCP and RRC tasks immediately after accepting that command, permitting their state to diverge. Network access and a valid RRC command are required; Qualcomm has not disclosed which modem data or operations become exposed or altered by the race.

The record

CVE
CVE-2021-30342
Published
Jun 14, 2022
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-367
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 14, 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

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=APQ8009W, APQ8017, APQ8096AU, AQT1000, CSRB31024, FSM10055, FSM10056, MDM8207, MDM9150, MDM9205, MDM9206, MDM9207, MDM9250, MDM9607, MDM9628, MDM9640, MDM9650, MDM9655, MSM8909W, MSM8996AU, QCA4004, QCA6174A, QCA6420, QCA6430, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6584AU, QCA6595AU, QCA6696, QCA9367, QCA9377, QCM2290, QCM4290, QCM6125, QCS2290, QCS410, QCS4290, QCS610, QCS6125, QSW8573, SA415M, SA6145P, SA6150P, SA6155P, SA8145P, SA8150P, SA8155P, SA8195P, SD 675, SD 8cx Gen2, SD205, SD210, SD429, SD439, SD460, SD660, SD662, SD665, SD675, SD678, SD680, SD720G, SD730, SD7c, SD850, SD855, SDA429W, SDM429W, SDW2500, SDX12, SDX20, SDX24, SDXR1, SM6250, SM6250P, SW5100, SW5100P, WCD9306, WCD9330, WCD9370, WCD9375, WCD9380, WCN3610, WCN3620, WCN3910, WCN3950, WCN3988, WCN3991, WCN3998, WSA8830, WSA8835

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=APQ8009W, APQ8017, APQ8096AU, AQT1000, CSRB31024, FSM10055, FSM10056, MDM8207, MDM9150, MDM9205, MDM9206, MDM9207, MDM9250, MDM9607, MDM9628, MDM9640, MDM9650, MDM9655, MSM8909W, MSM8996AU, QCA4004, QCA6174A, QCA6420, QCA6430, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6584AU, QCA6595AU, QCA6696, QCA9367, QCA9377, QCM2290, QCM4290, QCM6125, QCS2290, QCS410, QCS4290, QCS610, QCS6125, QSW8573, SA415M, SA6145P, SA6150P, SA6155P, SA8145P, SA8150P, SA8155P, SA8195P, SD 675, SD 8cx Gen2, SD205, SD210, SD429, SD439, SD460, SD660, SD662, SD665, SD675, SD678, SD680, SD720G, SD730, SD7c, SD850, SD855, SDA429W, SDM429W, SDW2500, SDX12, SDX20, SDX24, SDXR1, SM6250, SM6250P, SW5100, SW5100P, WCD9306, WCD9330, WCD9370, WCD9375, WCD9380, WCN3610, WCN3620, WCN3910, WCN3950, WCN3988, WCN3991, WCN3998, WSA8830, WSA8835

Published CVSS scores

7.1NIST NVDAV:N/AC:M/Au:N/C:C/I:N/A:N
9.1Qualcomm, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition

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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