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CVE-2021-40426

29
FAUCET Score

CVE-2021-40426 is a heap-based buffer overflow vulnerability in the libsox Sound Exchange library (versions 14.4.2 and master commit 42b3557e). This high-severity vulnerability (CVSS 8.8) can be triggered by a specially-crafted file, leading to potential high impact on confidentiality, integrity, and availability if a user opens a malicious file. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the potential for a complete compromise remains significant.

Impacted Technologies

VendorProductVersion(s)CPE
14.4.2CPE matchmatch criteria
cpe:2.3:a:sound_exchange_project:sound_exchange:14.4.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

10.0CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.21%
Probability of exploitation in next 30 days
EPSS Percentile
80.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0221 is in the 80th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2021-40426Moderate

sox: heap-based buffer overflow vulnerability exists in the sphere.c start_read() function

Apr 14, 2022

References

lists.debian.org / debian-lts-announce/2023/02/msg00009.html
talosintelligence.com / vulnerability_reports/TALOS-2021-1434
ExploitThird Party Advisory
debian.org / security/2023/dsa-5356
openwall.com / lists/oss-security/2023/02/03/3