CVE-2021-1955Network attack vector

Service interruption via rejected WLAN association

Published Jul 13, 2021 · Updated Aug 3, 2024

Reachable assertion in Qualcomm Snapdragon WLAN firmware allows remote attackers to interrupt service by causing an association rejection. The WLAN SAP connection-handling path improperly processes a connection after its association is rejected and reaches an assertion that terminates service. No authentication or user interaction is required; exposure is limited to devices using an affected Snapdragon platform with the vulnerable WLAN firmware.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in Qualcomm Snapdragon WLAN firmware allows remote attackers to interrupt service by causing an association rejection. The WLAN SAP connection-handling path improperly processes a connection after its association is rejected and reaches an assertion that terminates service. No authentication or user interaction is required; exposure is limited to devices using an affected Snapdragon platform with the vulnerable WLAN firmware.

The record

CVE
CVE-2021-1955
Published
Jul 13, 2021
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 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=APQ8009, APQ8009W, APQ8017, APQ8053, APQ8064AU, APQ8096AU, AQT1000, AR6003, AR8031, AR8035, CSR6030, CSRA6620, CSRA6640, CSRB31024, MDM8215, MDM8215M, MDM8615M, MDM9150, MDM9206, MDM9215, MDM9230, MDM9250, MDM9310, MDM9330, MDM9607, MDM9615, MDM9615M, MDM9626, MDM9628, MDM9630, MDM9640, MDM9650, MSM8909W, MSM8917, MSM8953, MSM8996AU, QCA4020, QCA6174, QCA6174A, QCA6175A, QCA6310, QCA6335, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6584AU, QCA6595, QCA6595AU, QCA6696, QCA8337, QCA9367, QCA9377, QCA9379, QCM2290, QCM4290, QCM6125, QCS2290, QCS405, QCS4290, QCS603, QCS605, QCS6125, QET4101, QSW8573, Qualcomm215, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SD 455, SD 636, SD 675, SD 8C, SD 8CX, SD205, SD210, SD429, SD439, SD450, SD460, SD480, SD632, SD660, SD662, SD665, SD670, SD675, SD678, SD690 5G, SD710, SD720G, SD730, SD750G, SD765, SD765G, SD7 ...[truncated*]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=APQ8009, APQ8009W, APQ8017, APQ8053, APQ8064AU, APQ8096AU, AQT1000, AR6003, AR8031, AR8035, CSR6030, CSRA6620, CSRA6640, CSRB31024, MDM8215, MDM8215M, MDM8615M, MDM9150, MDM9206, MDM9215, MDM9230, MDM9250, MDM9310, MDM9330, MDM9607, MDM9615, MDM9615M, MDM9626, MDM9628, MDM9630, MDM9640, MDM9650, MSM8909W, MSM8917, MSM8953, MSM8996AU, QCA4020, QCA6174, QCA6174A, QCA6175A, QCA6310, QCA6335, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6584AU, QCA6595, QCA6595AU, QCA6696, QCA8337, QCA9367, QCA9377, QCA9379, QCM2290, QCM4290, QCM6125, QCS2290, QCS405, QCS4290, QCS603, QCS605, QCS6125, QET4101, QSW8573, Qualcomm215, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SD 455, SD 636, SD 675, SD 8C, SD 8CX, SD205, SD210, SD429, SD439, SD450, SD460, SD480, SD632, SD660, SD662, SD665, SD670, SD675, SD678, SD690 5G, SD710, SD720G, SD730, SD750G, SD765, SD765G, SD7 ...[truncated*]

Published CVSS scores

7.5Qualcomm, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/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 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-617Reachable Assertion
T1499.004Application or System Exploitation

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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