How severe is CVE-2021-40826?

CVE-2021-40826 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40826 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40826?

CVE-2021-40826 affects Clementine-player Clementine. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40826?

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-2021-40826 published?

CVE-2021-40826 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-40826

CVE-2021-40826 is a high-severity vulnerability in Clementine-player Clementine with a CVSS 3.x base score of 7.8. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Clementine-player Clementine
Published: 2021-12-15
Last modified: 2026-06-17

Description

Clementine Music Player through 1.3.1 is vulnerable to a User Mode Write Access Violation, affecting the MP3 file parsing functionality at clementine+0x3aa207. The vulnerability is triggered when the user opens a crafted MP3 file or loads a remote stream URL that is mishandled by Clementine. Attackers could exploit this issue to cause a crash (DoS) of the clementine.exe process or achieve arbitrary code execution in the context of the current logged-in Windows user.

Frequently asked questions

What is CVE-2021-40826?: Clementine Music Player through 1.3.1 is vulnerable to a User Mode Write Access Violation, affecting the MP3 file parsing functionality at clementine+0x3aa207. The vulnerability is triggered when the user opens a crafted MP3 file or loads a remote stream URL that is mishandled by Clementine. Attackers could exploit this issue to cause a crash (DoS) of the clementine.exe process or achieve arbitrary code execution in the context of the current logged-in Windows user.
How severe is CVE-2021-40826?: CVE-2021-40826 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40826 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40826?: CVE-2021-40826 affects Clementine-player Clementine. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40826?: 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-2021-40826 published?: CVE-2021-40826 was published on 2021-12-15 and last updated on 2026-06-17.

References

https://voidsec.com/advisories/cve-2021-40826/

Affected products (1)

cpe:2.3:a:clementine-player:clementine:*:*:*:*:*:*:*:*

More vulnerabilities in Clementine-player Clementine

CVE-2021-40827 — High (CVSS 7.8): Clementine Music Player through 1.3.1 (when a GLib 2.0.0 DLL is used) is vulnerable to a Read Access Violation on Block…
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CVE-2018-14332 — Medium (CVSS 5.5): An issue was discovered in Clementine Music Player 1.3.1. Clementine.exe is vulnerable to a user mode write access…

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