Is CVE-2021-3643 in the CISA KEV catalog?

No. CVE-2021-3643 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3643?

CVE-2021-3643 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2021-3643?

CVE-2021-3643 has an EPSS score of 1.49% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3643?

Upgrade sox on debian 11 to 14.4.2+git20190427-2+deb11u1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3643

CRITICALEPSS 71th pctl

9.1

CVSS v3

NVD

Description

A flaw was found in sox 14.4.1. The lsx_adpcm_init function within libsox leads to a global-buffer-overflow. This flaw allows an attacker to input a malicious file, leading to the disclosure of sensitive information.

CWE-125Out-of-bounds Read CWE-120Classic Buffer Overflow

How to fix

Remediation Available

soxDebian

Fixed in:14.4.2+git20190427-2+deb11u1CVE-2021-3643

Fixed in:14.4.2+git20190427-3.2CVE-2021-3643

libsox2Ubuntu

Fixed in:14.4.1-3ubuntu1.1+esm2USN-5904-1

Fixed in:14.4.1-5+deb8u4ubuntu0.1+esm1USN-5904-1

libsox3Ubuntu

Fixed in:14.4.2-3ubuntu0.18.04.2USN-5904-1

Fixed in:14.4.2+git20190427-2+deb11u1build0.20.04.1USN-5904-1

Fixed in:14.4.2+git20190427-2+deb11u1build0.22.04.1USN-5904-1

Fixed in:14.4.2+git20190427-3ubuntu0.1USN-5904-1

soxUbuntu

Fixed in:14.4.1-3ubuntu1.1+esm2USN-5904-1

Fixed in:14.4.1-5+deb8u4ubuntu0.1+esm1USN-5904-1

Fixed in:14.4.2-3ubuntu0.18.04.2USN-5904-1

Fixed in:14.4.2+git20190427-2+deb11u1build0.20.04.1USN-5904-1

Fixed in:14.4.2+git20190427-2+deb11u1build0.22.04.1USN-5904-1

Fixed in:14.4.2+git20190427-3ubuntu0.1USN-5904-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploit Intelligence

1.49%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Third-Party Advisory1

bugzilla.redhat.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-06-27.