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Fencer Vulns
medium 5.5

CVE-2021-0561 json

In append_to_verify_fifo_interleaved_ of stream_encoder.c, there is a possible out of bounds write due to a missing bounds check.

published 2021-06-22 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-3180

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

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

Patch / fix

  • flac Debian 14, Debian 13, Debian 12 1.3.4-1

debian advisories DEBIAN-CVE-2021-0561

  • flac Ubuntu 18.04 LTS 1.3.2-1ubuntu0.1
  • flac Ubuntu 20.04 LTS 1.3.3-1ubuntu0.1
  • flac Ubuntu 22.04 LTS 1.3.3-2ubuntu0.1
  • flac Ubuntu Pro 14.04 LTS 1.3.0-2ubuntu0.14.04.1+esm1
  • flac Ubuntu Pro 16.04 LTS 1.3.1-4ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-0561

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • flac RHEL 9 1.3.3-10.el9
  • flac-libs RHEL 9 1.3.3-10.el9

red hat advisories RHSA-2022:8078

  • flac SLE Real Time 15 SP2, SLE Module for Package Hub 15 SP3, SLE Module for Basesystem 15 SP3 1.3.2-3.9.1
  • flac SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +1 more 1.3.0-18.5.1

suse advisories SUSE-SU-2022:0815-1SUSE-SU-2022:0814-1

  • flac openSUSE Tumbleweed 1.3.4-1.1
  • vlc Package Hub 15 SP3, openSUSE Leap 15.3 3.0.18-bp153.2.6.1
  • flac openSUSE Leap 15.3 1.3.2-3.9.1

opensuse advisories openSUSE-SU-2024:11885-1openSUSE-SU-2022:10252-1openSUSE-SU-2022:0815-1

  • flac AlmaLinux 9 1.3.3-10.el9
  • flac-libs AlmaLinux 9 1.3.3-10.el9

almalinux advisories ALSA-2022:8078

  • flac Rocky Linux 9 1.3.3-10.el9

rocky linux advisories RLSA-2022:8078

  • flac Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 1.3.4-r0

alpine advisories ALPINE-CVE-2021-0561

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • flac Arch Linux 1.3.4-1

arch linux advisories AVG-2092

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-0561 updated cvss 5.5

flac: out of bound write in append_to_verify_fifo_interleaved_ of stream_encoder.c

  • Red Hat Enterprise Linux 6 flac Red Hat Enterprise Linux 7 flac, flac-libs
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 flac, flac-libs
    affected: no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 9) flac 1.3.3-10.el9 Red Hat Enterprise Linux AppStream (v. 9) flac 1.3.3-10.el9, flac-libs 1.3.3-10.el9
    fixed: vendor fix RHSA-2022:8078

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a Android

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.