CVE-2021-23210Public exploit

Application crash via zero VOC sample size

Published Aug 25, 2022 · Updated Aug 3, 2024

Divide-by-zero in SoX's VOC parser allows attackers to crash the application by processing a crafted Creative Voice file. In read_samples() in voc.c, a zero sample-size value taken from VOC block metadata becomes the divisor in 9 / v->size when samples per byte are calculated. The file must be opened or passed to SoX for local processing; the demonstrated consequence is an application crash, not code execution or data access.

CVSS severity5.5
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in SoX's VOC parser allows attackers to crash the application by processing a crafted Creative Voice file. In read_samples() in voc.c, a zero sample-size value taken from VOC block metadata becomes the divisor in 9 / v->size when samples per byte are calculated. The file must be opened or passed to SoX for local processing; the demonstrated consequence is an application crash, not code execution or data access.

The record

CVE
CVE-2021-23210
Published
Aug 25, 2022
Updated
Aug 3, 2024
Vendor
Chris Bagwell
Product
SoX
Classifications
CWE-369
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2022CVE 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?

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  1. Affected versionversion=Not Known

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Chris Bagwell · SoXversion=Not Known

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.3SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-369Divide By Zero

Public exploit references

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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