CVE-2021-1912

TrustZone compromise via unchecked count and grace arithmetic

Published Nov 12, 2021 · Updated Aug 3, 2024

Integer overflow in Qualcomm Snapdragon TrustZone on listed chipsets allows local users to compromise confidentiality, integrity, and availability. TrustZone code calculates a count and grace period without properly validating an input length, allowing the arithmetic to wrap. Exploitation requires local access but no prior privileges or user interaction; Qualcomm has not disclosed a more specific trigger or resulting operation.

CVSS severity8.4
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Qualcomm Snapdragon TrustZone on listed chipsets allows local users to compromise confidentiality, integrity, and availability. TrustZone code calculates a count and grace period without properly validating an input length, allowing the arithmetic to wrap. Exploitation requires local access but no prior privileges or user interaction; Qualcomm has not disclosed a more specific trigger or resulting operation.

The record

CVE
CVE-2021-1912
Published
Nov 12, 2021
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-190
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 12, 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

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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, QCA6584AU, QCA6595AU, QCA6696, QCA8337, QCA9377, QCX315, SA415M, SA515M, SD 8C, SD 8CX, SD855, SD865 5G, SD870, SDX24, SDX55, SDX55M, SDXR2 5G, WCD9340, WCD9341, WCD9380, WCD9385, WCN3998, WCN6750, WCN6850, WCN6851, WSA8810, WSA8815

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=AQT1000, AR8035, CSRB31024, QCA6174A, QCA6390, QCA6391, QCA6420, QCA6421, QCA6426, QCA6430, QCA6431, QCA6436, QCA6564AU, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA8337, QCA9377, QCX315, SA415M, SA515M, SD 8C, SD 8CX, SD855, SD865 5G, SD870, SDX24, SDX55, SDX55M, SDXR2 5G, WCD9340, WCD9341, WCD9380, WCD9385, WCN3998, WCN6750, WCN6850, WCN6851, WSA8810, WSA8815

Published CVSS scores

8.4QualcommCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

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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