CVE-2021-40827

Code execution via MP3 parsing memory corruption

Published Dec 15, 2021 · Updated Aug 4, 2024

Memory corruption in Clementine Music Player 1.3.1 and earlier allows context-dependent attackers to execute code via crafted MP3 data. Malformed MP3 data reaches the parsing path's memcpy operation, where a block move accesses invalid memory. Exploitation requires a Windows build using the GLib 2.0.0 DLL and user interaction to open the file or stream; successful attacks run code as the logged-in user or crash clementine.exe.

CVSS severity7.8
High
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Clementine Music Player 1.3.1 and earlier allows context-dependent attackers to execute code via crafted MP3 data. Malformed MP3 data reaches the parsing path's memcpy operation, where a block move accesses invalid memory. Exploitation requires a Windows build using the GLib 2.0.0 DLL and user interaction to open the file or stream; successful attacks run code as the logged-in user or crash clementine.exe.

The record

CVE
CVE-2021-40827
Published
Dec 15, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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