# CVE-2021-0561: Memory corruption in Android > A missing bounds check in the Android audio encoder allows local attackers to perform an out-of-bounds write, leading to information disclosure without user interaction. - **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 22 Jun 2021 - **Updated:** 3 Aug 2024 - **Also known as:** A-174302683, ALPINE-CVE-2021-0561, ALSA-2022:8078, DEBIAN-CVE-2021-0561, DLA-2951-1, DLA-3094-1, GHSA-crfc-rr25-6wf2, MGASA-2022-0085, OESA-2022-1611, PUB-A-174302683, RHSA-2022:8078, RLSA-2022:8078, SUSE-SU-2022:0814-1, SUSE-SU-2022:0815-1, UBUNTU-CVE-2021-0561, openSUSE-SU-2022:0815-1 ## What is CVE-2021-0561? CVE-2021-0561 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 22 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description 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 Weakness: CWE-787 (Out-of-bounds Write) ## Which versions are affected by CVE-2021-0561? It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `flac` | AlmaLinux:9 | All versions | 1.3.3-10.el9 | | `flac-devel` | AlmaLinux:9 | All versions | 1.3.3-10.el9 | | `flac-libs` | AlmaLinux:9 | All versions | 1.3.3-10.el9 | | `flac` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.3.3-10.el9 | | `flac-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.3.3-10.el9 | | `flac-debugsource` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.3.3-10.el9 | | `flac-libs` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.3.3-10.el9 | | `flac-libs-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.3.3-10.el9 | | `flac` | Red Hat:enterprise_linux:9::crb | All versions | 0:1.3.3-10.el9 | | `flac-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 0:1.3.3-10.el9 | | `flac-debugsource` | Red Hat:enterprise_linux:9::crb | All versions | 0:1.3.3-10.el9 | | `flac-devel` | Red Hat:enterprise_linux:9::crb | All versions | 0:1.3.3-10.el9 | | `flac-libs-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 0:1.3.3-10.el9 | | `flac` | Rocky Linux:9 | All versions | 0:1.3.3-10.el9 | | `flac` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 1.3.2-3.9.1 | | `flac` | SUSE:Linux Enterprise Module for Package Hub 15 SP3 | All versions | 1.3.2-3.9.1 | | `flac` | SUSE:Linux Enterprise Real Time 15 SP2 | All versions | 1.3.2-3.9.1 | | `flac` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 1.3.0-18.5.1 | | `flac` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 1.3.0-18.5.1 | | `flac` | SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 1.3.0-18.5.1 | | `flac` | SUSE:Linux Enterprise Workstation Extension 12 SP5 | All versions | 1.3.0-18.5.1 | | `flac` | openSUSE:Leap 15.3 | All versions | 1.3.2-3.9.1 | Products: Debian Debian Linux, Fedoraproject Fedora, Google Android. ## How do I fix CVE-2021-0561? Apply the vendor's patch. ## Is CVE-2021-0561 being exploited? There is no known exploitation of CVE-2021-0561 in the wild and no public exploit code. ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-0561 and fix it if it is affected. What it is: CVE-2021-0561 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 22 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2021-0561 in the wild and no public exploit code. Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2021-0561/ (Markdown: https://insights.sbomify.com/CVE-2021-0561/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-0561 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-0561 - OSV: https://osv.dev/vulnerability/CVE-2021-0561 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-0561/ Summaries are generated and may contain mistakes; the official description above is the record.