CVE-2021-32419Public exploitNetwork attack vector

Heap data exposure via out-of-bounds MTM read

Published Feb 17, 2023 · Updated Mar 18, 2025

Out-of-bounds read in Schism Tracker 20200412 allows context-dependent attackers to expose heap data through a crafted MTM file. In fmt/mtm.c, fmt_mtm_load_song accesses trackdata[n] after n reaches the allocated track-data boundary, and the patch removes this unused access. The public reproducer requires opening an attacker-supplied MTM module; the observed consequence is an eight-byte heap read that remains silent without memory instrumentation.

CVSS severity5.3
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Schism Tracker 20200412 allows context-dependent attackers to expose heap data through a crafted MTM file. In fmt/mtm.c, fmt_mtm_load_song accesses trackdata[n] after n reaches the allocated track-data boundary, and the patch removes this unused access. The public reproducer requires opening an attacker-supplied MTM module; the observed consequence is an eight-byte heap read that remains silent without memory instrumentation.

The record

CVE
CVE-2021-32419
Published
Feb 17, 2023
Updated
Mar 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2025Record 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File

Public exploit references

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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