CVE-2021-3643

Memory disclosure via libsox global-buffer over-read

Published May 2, 2022 · Updated Aug 3, 2024

Out-of-bounds read in libsox in Chris Bagwell SoX 14.4.1 allows context-dependent attackers to disclose memory via a malicious audio file. The lsx_adpcm_init function reads beyond a global buffer while initializing ADPCM state from crafted file data. The file must be processed by SoX; the published impact is memory disclosure, with no reported data modification.

CVSS severity9.1
Critical
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in libsox in Chris Bagwell SoX 14.4.1 allows context-dependent attackers to disclose memory via a malicious audio file. The lsx_adpcm_init function reads beyond a global buffer while initializing ADPCM state from crafted file data. The file must be processed by SoX; the published impact is memory disclosure, with no reported data modification.

The record

CVE
CVE-2021-3643
Published
May 2, 2022
Updated
Aug 3, 2024
Vendor
Chris Bagwell
Product
SoX
Classifications
CWE-120, CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 2, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=sox 14.4.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Chris Bagwell · SoXversion=sox 14.4.1

Published CVSS scores

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
5.1SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-125Out-of-bounds Read
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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