CVE-2021-1914Network attack vector

Availability loss via infinite loop on unsupported input

Published Sep 8, 2021 · Updated Aug 3, 2024

Snapdragon products contain a loop-handling vulnerability that allows remote attackers to cause service interruption via unsupported input. Modem processing accepts an unsupported input value and enters a loop whose exit condition cannot be reached, preventing normal processing. The published CVSS vector requires no authentication or user interaction and limits the stated impact to availability; Qualcomm has not publicly identified a more specific affected component or exploit path.

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

Snapdragon products contain a loop-handling vulnerability that allows remote attackers to cause service interruption via unsupported input. Modem processing accepts an unsupported input value and enters a loop whose exit condition cannot be reached, preventing normal processing. The published CVSS vector requires no authentication or user interaction and limits the stated impact to availability; Qualcomm has not publicly identified a more specific affected component or exploit path.

The record

CVE
CVE-2021-1914
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-835, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5QualcommCVSS: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-835Loop with Unreachable Exit Condition ('Infinite Loop')
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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