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CVE Record

CVE-2021-39552: An issue was discovered in sela through 20200412.

An issue was discovered in sela through 20200412. file::WavFile::readFromFile() in wav_file.c has a heap-based buffer overflow.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-39552 is a reported heap-based buffer overflow in sela through 20200412 when reading WAV files. Business risk depends on whether sela is used to process audio, especially files supplied by users, partners, or automated ingestion systems. The public record does not provide severity scoring or a confirmed fix.

Executive priority

Prioritize an exposure check, not an emergency response, unless the organization processes untrusted WAV files with sela. If that condition exists, reduce ingestion risk quickly and confirm an update or compensating control path with the project maintainer guidance.

Technical view

The CVE identifies file::WavFile::readFromFile() in wav_file.c as containing a heap-based buffer overflow. The source bundle names sela through 20200412, but lacks CVSS, CWE, CPE, vendor metadata, and remediation details. Treat crafted WAV parsing as the likely trigger context, based on the affected function.

Likely exposure

Exposure is likely limited to systems using sela through 20200412 or code derived from it to parse WAV files. Risk is higher where WAV files come from untrusted sources or batch-processing pipelines. The provided sources do not identify packaged distributions, downstream products, or affected CPEs.

Exploitation context

The provided sources do not show active exploitation, and the CVE is not listed as KEV in the bundle. Public evidence confirms a vulnerability report, not operational exploitation. Avoid assuming internet-scale exploitation without additional vendor, threat intelligence, or incident evidence.

Researcher notes

Evidence is incomplete. The public CVE record gives the vulnerable function and version boundary, but no CVSS vector, CWE mapping, patch commit, exploit status, or affected CPEs. Further analysis should focus on source review, reachable parsing paths, and upstream issue history.

Mitigation direction

  • Inventory systems and codebases that use sela or derived WAV parsing code.
  • Check the upstream project issue and CVE record for fixed versions or maintainer guidance.
  • Avoid processing untrusted WAV files until remediation status is confirmed.
  • Sandbox or isolate audio parsing workloads that must handle external files.
  • Add file handling limits and monitoring around WAV ingestion paths.

Validation and detection

  • Confirm whether sela is present in source, dependencies, containers, or build artifacts.
  • Identify any deployments processing user-supplied or partner-supplied WAV files.
  • Verify the deployed sela code is newer than 20200412 or patched by maintainers.
  • Review crash logs for WAV parsing failures in affected services.
  • Track the referenced GitHub issue for remediation or maintainer clarification.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-39552 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.