CVE-2021-35078Network attack vector

Remote service interruption via certificate-chain memory leak

Published Jun 14, 2022 · Updated Aug 4, 2024

Memory leak in Qualcomm Snapdragon firmware allows remote attackers to interrupt service via a crafted server certificate chain. The certificate-chain parser improperly validates the server-reported chain length, causing memory to remain allocated as it processes the chain. An unauthenticated network peer can trigger the availability-only condition without user interaction; repeated processing can exhaust memory and interrupt the affected device.

CVSS severity7.5
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in Qualcomm Snapdragon firmware allows remote attackers to interrupt service via a crafted server certificate chain. The certificate-chain parser improperly validates the server-reported chain length, causing memory to remain allocated as it processes the chain. An unauthenticated network peer can trigger the availability-only condition without user interaction; repeated processing can exhaust memory and interrupt the affected device.

The record

CVE
CVE-2021-35078
Published
Jun 14, 2022
Updated
Aug 4, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-401, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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, AR8035, CSRB31024, QCA6174A, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564AU, QCA6574A, QCA6574AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCM2290, QCM4290, QCM6125, QCM6490, QCS2290, QCS410, QCS4290, QCS603, QCS605, QCS610, QCS6125, QCS6490, SA415M, SA515M, SC8180X+SDX55, SD 675, SD 8 Gen1 5G, SD 8CX, SD 8cx Gen2, SD460, SD480, SD662, SD665, SD670, SD675, SD678, SD680, SD690 5G, SD695, SD710, SD712, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD855, SD865 5G, SD870, SD888, SD888 5G, SDX24, SDX50M, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM4125, SM6250, SM6250P, SM7250P, SM7315, SM7325P, SW5100, SW5100P, WCD9326, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9371, WCD9375, WCD9380, WCD9385, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, WSA8810, WSA8815, WSA8830, WSA8835

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=AQT1000, AR8035, CSRB31024, QCA6174A, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564AU, QCA6574A, QCA6574AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCM2290, QCM4290, QCM6125, QCM6490, QCS2290, QCS410, QCS4290, QCS603, QCS605, QCS610, QCS6125, QCS6490, SA415M, SA515M, SC8180X+SDX55, SD 675, SD 8 Gen1 5G, SD 8CX, SD 8cx Gen2, SD460, SD480, SD662, SD665, SD670, SD675, SD678, SD680, SD690 5G, SD695, SD710, SD712, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD855, SD865 5G, SD870, SD888, SD888 5G, SDX24, SDX50M, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM4125, SM6250, SM6250P, SM7250P, SM7315, SM7325P, SW5100, SW5100P, WCD9326, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9371, WCD9375, WCD9380, WCD9385, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, WSA8810, WSA8815, WSA8830, WSA8835

Published CVSS scores

7.8NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5Qualcomm, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

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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