How severe is CVE-2021-40426?

CVE-2021-40426 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40426 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40426?

CVE-2021-40426 affects Sound Exchange Project Sound Exchange. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40426?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-40426 published?

CVE-2021-40426 was published on 2022-04-14 and last updated on 2026-06-17.

CVE-2021-40426

CVE-2021-40426 is a high-severity vulnerability in Sound Exchange Project Sound Exchange with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-122
Affected product: Sound Exchange Project Sound Exchange
Published: 2022-04-14
Last modified: 2026-06-17

Description

A heap-based buffer overflow vulnerability exists in the sphere.c start_read() functionality of Sound Exchange libsox 14.4.2 and master commit 42b3557e. A specially-crafted file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.

Frequently asked questions

What is CVE-2021-40426?: A heap-based buffer overflow vulnerability exists in the sphere.c start_read() functionality of Sound Exchange libsox 14.4.2 and master commit 42b3557e. A specially-crafted file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.
How severe is CVE-2021-40426?: CVE-2021-40426 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40426 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40426?: CVE-2021-40426 affects Sound Exchange Project Sound Exchange. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40426?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-40426 published?: CVE-2021-40426 was published on 2022-04-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sound_exchange_project:sound_exchange:14.4.2:*:*:*:*:*:*:*

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CVE-2023-34318 — High (CVSS 7.8): A heap buffer overflow vulnerability was found in sox, in the startread function at sox/src/hcom.c:160:41. This flaw…
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CVE-2023-32627 — Medium (CVSS 6.2): A floating point exception vulnerability was found in sox, in the read_samples function at sox/src/voc.c:334:18. This…

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