CVE-2021-35083Network attack vector

Memory disclosure and service interruption via certificate-chain over-read

Published Jun 14, 2022 · Updated Aug 4, 2024

A buffer over-read in Qualcomm Snapdragon Data Modem firmware allows remote attackers to disclose memory or interrupt service. Data Modem SSL and Internet Key Exchange handling reads a certificate chain without adequately validating its bounds, causing an out-of-bounds access. No authentication or user interaction is required; the documented consequences are data disclosure and degraded availability, with no integrity impact.

CVSS severity8.2
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer over-read in Qualcomm Snapdragon Data Modem firmware allows remote attackers to disclose memory or interrupt service. Data Modem SSL and Internet Key Exchange handling reads a certificate chain without adequately validating its bounds, causing an out-of-bounds access. No authentication or user interaction is required; the documented consequences are data disclosure and degraded availability, with no integrity impact.

The record

CVE
CVE-2021-35083
Published
Jun 14, 2022
Updated
Aug 4, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-125
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=APQ8009, APQ8009W, APQ8017, APQ8037, APQ8053, APQ8096AU, AQT1000, AR8031, AR8035, CSRA6620, CSRA6640, CSRB31024, MDM9150, MDM9206, MDM9250, MDM9607, MDM9628, MDM9640, MDM9650, MSM8108, MSM8208, MSM8209, MSM8608, MSM8909W, MSM8917, MSM8920, MSM8937, MSM8940, MSM8953, MSM8996AU, QCA6174A, QCA6310, QCA6320, QCA6335, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9367, QCA9377, QCA9379, QCM2290, QCM4290, QCM6125, QCN7605, QCN7606, QCS2290, QCS405, QCS410, QCS4290, QCS603, QCS605, QCS610, QCS6125, Qualcomm215, SA415M, SA515M, SC8180X+SDX55, SD 636, SD 675, SD 8 Gen1 5G, SD 8CX, SD 8cx Gen2, SD210, SD429, SD439, SD450, SD460, SD480, SD632, SD660, SD662, SD665, SD670, SD675, SD678, SD680, SD690 5G, SD695, SD710, SD712, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD820, SD821, SD835, SD845, SD850, SD855, SD865 5G, SD870, SD888, SD888 5G, SDM429W, SDM630, ...[truncated*]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=APQ8009, APQ8009W, APQ8017, APQ8037, APQ8053, APQ8096AU, AQT1000, AR8031, AR8035, CSRA6620, CSRA6640, CSRB31024, MDM9150, MDM9206, MDM9250, MDM9607, MDM9628, MDM9640, MDM9650, MSM8108, MSM8208, MSM8209, MSM8608, MSM8909W, MSM8917, MSM8920, MSM8937, MSM8940, MSM8953, MSM8996AU, QCA6174A, QCA6310, QCA6320, QCA6335, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9367, QCA9377, QCA9379, QCM2290, QCM4290, QCM6125, QCN7605, QCN7606, QCS2290, QCS405, QCS410, QCS4290, QCS603, QCS605, QCS610, QCS6125, Qualcomm215, SA415M, SA515M, SC8180X+SDX55, SD 636, SD 675, SD 8 Gen1 5G, SD 8CX, SD 8cx Gen2, SD210, SD429, SD439, SD450, SD460, SD480, SD632, SD660, SD662, SD665, SD670, SD675, SD678, SD680, SD690 5G, SD695, SD710, SD712, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD7c, SD820, SD821, SD835, SD845, SD850, SD855, SD865 5G, SD870, SD888, SD888 5G, SDM429W, SDM630, ...[truncated*]

Published CVSS scores

9.4NIST NVDAV:N/AC:L/Au:N/C:C/I:N/A:C
8.2Qualcomm, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

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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-125Out-of-bounds Read

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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