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CVE-2021-0561: In append_to_verify_fifo_interleaved_ of stream_encoder.c, there is a possible out of bounds write due to a...

In append_to_verify_fifo_interleaved_ of stream_encoder.c, there is a possible out of bounds write due to a missing bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-174302683

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-0561 is an Android 11 flaw in audio encoding code where missing bounds checking could write outside an expected buffer. The stated impact is local information disclosure without extra privileges and without user interaction. The source bundle does not provide CVSS, a vendor severity, or evidence of active exploitation.

Executive priority

Treat this as a patch management issue with moderate urgency. It is not documented here as remotely exploitable or actively exploited, but affected Android 11 and FLAC-related packages should be verified because the flaw can disclose local information without user interaction.

Technical view

The issue is in append_to_verify_fifo_interleaved_ in stream_encoder.c. The CVE describes an out-of-bounds write caused by a missing bounds check, with Android ID A-174302683 and Android 11 listed as affected. Debian and Fedora references are FLAC security updates, but exact affected package versions are not provided here.

Likely exposure

Primary exposure is Android 11 systems containing the vulnerable encoder code. The Debian and Fedora advisories indicate FLAC-related downstream updates, so vulnerability managers should also check Linux FLAC packages against their distribution advisories.

Exploitation context

The bundle says exploitation does not require user interaction or additional execution privileges, but frames the impact as local information disclosure. It does not cite public exploitation, proof-of-concept availability, or KEV listing; kev is false.

Researcher notes

Evidence is limited to the CVE description and vendor advisory references. The Android record names stream_encoder.c and Android ID A-174302683. Debian and Fedora references are FLAC security updates, suggesting shared upstream code, but this bundle does not include CVSS, CWE, exploit status, or exact fixed versions.

Mitigation direction

  • Apply relevant Android or Pixel security updates for June 2021 or later.
  • Check Debian and Fedora FLAC package advisories for fixed package versions.
  • Inventory Android 11 devices and prioritize unsupported or unpatched endpoints.
  • For other platforms, follow vendor FLAC package guidance rather than assuming Android-only exposure.

Validation and detection

  • Confirm Android 11 devices have received the applicable June 2021 security bulletin updates.
  • Review package managers for FLAC updates matching Debian or Fedora advisories.
  • Check vulnerability scanners for CVE-2021-0561 findings across mobile and Linux assets.
  • Document any assets where vendor fix status cannot be determined.
Prepared
Confidence
medium
Sources
7

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-2021-0561 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
6Source 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/aAndroidAndroid-11Listed
Weakness

CWE details

No CWE listed

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