# CVE-2021-33657: Memory corruption in SDL2 > A heap overflow in SDL2 allows attackers to execute arbitrary code or cause denial of service via malicious BMP files. - **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 1 Apr 2022 - **Updated:** 3 Aug 2024 - **Also known as:** DEBIAN-CVE-2021-33657, GHSA-9276-2w6v-wx4c, JLSEC-2026-364, MGASA-2022-0326, OESA-2022-1592, SUSE-SU-2022:1218-1, SUSE-SU-2022:1313-1, UBUNTU-CVE-2021-33657, USN-5398-1, openSUSE-SU-2024:11984-1 ## What is CVE-2021-33657? CVE-2021-33657 is a high-severity memory corruption vulnerability in SDL2, published on 1 Apr 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description There is a heap overflow problem in video/SDL_pixels.c in SDL (Simple DirectMedia Layer) 2.x to 2.0.18 versions. By crafting a malicious .BMP file, an attacker can cause the application using this library to crash, denial of service or Code execution. Weakness: CWE-787 (Out-of-bounds Write) ## Which versions are affected by CVE-2021-33657? It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `SDL2` | SUSE:Enterprise Storage 6 | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Enterprise Storage 7 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise High Performance Computing 15 SP2-ESPOS | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise Module for Desktop Applications 15 SP3 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise Module for Package Hub 15 SP3 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise Module for Package Hub 15 SP4 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise Real Time 15 SP2 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise Server 15 SP1-BCL | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise Server 15 SP1-LTSS | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise Server 15 SP2-BCL | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise Server 15 SP2-LTSS | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Linux Enterprise Server 15-LTSS | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise Server for SAP Applications 15 | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise Server for SAP Applications 15 SP1 | All versions | 2.0.8-150000.3.21.1 | | `SDL2` | SUSE:Linux Enterprise Server for SAP Applications 15 SP2 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Manager Proxy 4.1 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Manager Retail Branch Server 4.1 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | SUSE:Manager Server 4.1 | All versions | 2.0.8-150200.11.6.1 | | `SDL2` | openSUSE:Leap 15.3 | All versions | 2.0.8-150200.11.6.1 | Products: Libsdl Simple Directmedia Layer. ## How do I fix CVE-2021-33657? Upgrade to a fixed version. ## Is CVE-2021-33657 being exploited? There is no known exploitation of CVE-2021-33657 in the wild and no public exploit code. ## Other vulnerabilities in SDL2 - [CVE-2019-14906](https://insights.sbomify.com/CVE-2019-14906/): Memory corruption in SDL (high 8.1) - [CVE-2022-4743](https://insights.sbomify.com/CVE-2022-4743/): Denial of service in SDL2 (high 7.5) - [CVE-2022-34568](https://insights.sbomify.com/CVE-2022-34568/): Use after free in n/a (high 7.5) - [CVE-2019-12222](https://insights.sbomify.com/CVE-2019-12222/): Memory corruption in n/a (medium 6.5) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-33657 and fix it if it is affected. What it is: CVE-2021-33657 is a high-severity memory corruption vulnerability in SDL2, published on 1 Apr 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2021-33657 in the wild and no public exploit code. Affected product: SDL2. 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-2021-33657/ (Markdown: https://insights.sbomify.com/CVE-2021-33657/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33657 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33657 - OSV: https://osv.dev/vulnerability/CVE-2021-33657 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-33657/ Summaries are generated and may contain mistakes; the official description above is the record.