CVE-2021-3643

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.

Published: 2022-05-02 Last update: 2025-06-27 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3643 is rated Moderate Risk (61.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.40%). EPSS rose +1.32% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-3643

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.08% 1.40% +1.32%
2 2025-11-21 0.36% 0.08% -0.28%
3 2025-11-18 — 0.36% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3643

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2021-3643

OS Trackers for CVE-2021-3643

vendor priority summary link
alpine — CVE-2021-3643: 1 source package rows (sox); 6 state rows across 6 repos (3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 6, open 0. https://security.alpinelinux.org/vuln/CVE-2021-3643
debian not yet assigned CVE-2021-3643 not yet assigned priority: Debian including 1 source packages (sox), 3 status rows across 3 suites (bookworm, bullseye, trixie): resolved 3. https://security-tracker.debian.org/tracker/CVE-2021-3643
redhat medium — https://access.redhat.com/security/cve/CVE-2021-3643
suse medium CVE-2021-3643 severity moderate: SUSE including 9 source package names (libsox3-14.4.2-8.1, libsox3-14.4.2-bp154.2.3.1, …), 15 product×package rows across 5 product lines (SUSE Package Hub 15 SP4, SUSE Package Hub 15 SP5, … (5 product lines)): Fixed 15. https://www.suse.com/security/cve/CVE-2021-3643/
ubuntu medium CVE-2021-3643 medium priority: Ubuntu including 1 source packages (sox), 13 status rows across 13 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): released 6, ignored 4, not-affected 2, needs-triage 1. https://ubuntu.com/security/CVE-2021-3643

Affected software / configurations for CVE-2021-3643

Vendor Product Version Raw CPE
sound_exchange_project sound_exchange 14.4.1 cpe:2.3:a:sound_exchange_project:sound_exchange:14.4.1:*:*:*:*:*:*:*

References for CVE-2021-3643

URL Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1980626 Issue Tracking Third Party Advisory
cvelogic Threat Intelligence