CVE-2021-35097

Authentication bypass via out-of-order signature verification

Published Sep 2, 2022 · Updated Aug 4, 2024

Authentication bypass in Qualcomm Snapdragon content protection allows physically proximate attackers to read or alter protected content. The signature-verification call performs signature verification and hashing in the wrong order, allowing content to pass an improperly sequenced authenticity check. Physical access is required; successful exploitation defeats content confidentiality and integrity without interrupting service.

CVSS severity7.3
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Qualcomm Snapdragon content protection allows physically proximate attackers to read or alter protected content. The signature-verification call performs signature verification and hashing in the wrong order, allowing content to pass an improperly sequenced authenticity check. Physical access is required; successful exploitation defeats content confidentiality and integrity without interrupting service.

The record

CVE
CVE-2021-35097
Published
Sep 2, 2022
Updated
Aug 4, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-347
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 2, 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, AR8031, AR8035, CSRA6620, CSRA6640, CSRB31024, MDM9150, QCA6174A, QCA6175A, QCA6310, QCA6335, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6595, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCM2290, QCM4290, QCM6125, QCM6490, QCS2290, QCS405, QCS410, QCS4290, QCS610, QCS6125, QCS6490, QRB5165, QRB5165M, QRB5165N, QSM8350, SA415M, SA515M, SA6145P, SA6155, SA6155P, SA8155, SA8155P, SA8195P, SA8540P, SA9000P, SC8180X+SDX55, SD 675, SD 8CX, SD 8cx Gen2, SD 8cx Gen3, SD460, SD480, SD662, SD665, SD675, SD678, SD680, SD690 5G, SD695, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD845, SD850, SD855, SD865 5G, SD870, SD888, SD888 5G, SDX24, SDX50M, SDX55, SDX55M, SDX65, SDXR2 5G, SM4125, SM6250, SM6250P, SM7250P, SM7315, SM7325P, SW5100, SW5100P, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9371, WCD9375, WCD9380, WCD9385, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, W ...[truncated*]

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=AQT1000, AR8031, AR8035, CSRA6620, CSRA6640, CSRB31024, MDM9150, QCA6174A, QCA6175A, QCA6310, QCA6335, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6595, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCM2290, QCM4290, QCM6125, QCM6490, QCS2290, QCS405, QCS410, QCS4290, QCS610, QCS6125, QCS6490, QRB5165, QRB5165M, QRB5165N, QSM8350, SA415M, SA515M, SA6145P, SA6155, SA6155P, SA8155, SA8155P, SA8195P, SA8540P, SA9000P, SC8180X+SDX55, SD 675, SD 8CX, SD 8cx Gen2, SD 8cx Gen3, SD460, SD480, SD662, SD665, SD675, SD678, SD680, SD690 5G, SD695, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD845, SD850, SD855, SD865 5G, SD870, SD888, SD888 5G, SDX24, SDX50M, SDX55, SDX55M, SDX65, SDXR2 5G, SM4125, SM6250, SM6250P, SM7250P, SM7315, SM7325P, SW5100, SW5100P, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9371, WCD9375, WCD9380, WCD9385, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, W ...[truncated*]

Published CVSS scores

7.3QualcommCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature

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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