# CVE-2020-14363: Use after free in libX11 > A local privileged attacker can exploit an integer overflow leading to a double-free in libX11 to crash applications or execute arbitrary code. - **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`) - **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:** 11 Sep 2020 - **Updated:** 4 Aug 2024 - **Also known as:** ALPINE-CVE-2020-14363, DEBIAN-CVE-2020-14363, DLA-2361-1, GHSA-qmwg-hw9q-xg39, JLSEC-2026-470, MGASA-2020-0349, RHSA-2020:4908, RHSA-2020:4946, SUSE-SU-2020:2474-1, SUSE-SU-2020:2474-2, SUSE-SU-2020:2475-1, SUSE-SU-2020:2475-2, UBUNTU-CVE-2020-14363, openSUSE-SU-2020:1368-1, openSUSE-SU-2020:1370-1 ## What is CVE-2020-14363? CVE-2020-14363 is a high-severity use after free vulnerability in Fedoraproject Fedora, published on 11 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability. Weakness: CWE-416 (Use After Free), CWE-190 (Integer Overflow or Wraparound) ## Which versions are affected by CVE-2020-14363? It affects 2 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libX11` | Red Hat:enterprise_linux:6::client | All versions | 0:1.6.4-4.el6_10 | | `libX11-common` | Red Hat:enterprise_linux:6::client | All versions | 0:1.6.4-4.el6_10 | | `libX11-debuginfo` | Red Hat:enterprise_linux:6::client | All versions | 0:1.6.4-4.el6_10 | | `libX11-devel` | Red Hat:enterprise_linux:6::client | All versions | 0:1.6.4-4.el6_10 | | `libX11` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.6.4-4.el6_10 | | `libX11-common` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.6.4-4.el6_10 | | `libX11-debuginfo` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.6.4-4.el6_10 | | `libX11-devel` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.6.4-4.el6_10 | | `libX11` | Red Hat:enterprise_linux:6::server | All versions | 0:1.6.4-4.el6_10 | | `libX11-common` | Red Hat:enterprise_linux:6::server | All versions | 0:1.6.4-4.el6_10 | | `libX11-debuginfo` | Red Hat:enterprise_linux:6::server | All versions | 0:1.6.4-4.el6_10 | | `libX11-devel` | Red Hat:enterprise_linux:6::server | All versions | 0:1.6.4-4.el6_10 | | `libX11` | Red Hat:enterprise_linux:6::workstation | All versions | 0:1.6.4-4.el6_10 | | `libX11-common` | Red Hat:enterprise_linux:6::workstation | All versions | 0:1.6.4-4.el6_10 | | `libX11-debuginfo` | Red Hat:enterprise_linux:6::workstation | All versions | 0:1.6.4-4.el6_10 | | `libX11-devel` | Red Hat:enterprise_linux:6::workstation | All versions | 0:1.6.4-4.el6_10 | | `libX11` | Red Hat:enterprise_linux:7::client | All versions | 0:1.6.7-3.el7_9 | | `libX11-common` | Red Hat:enterprise_linux:7::client | All versions | 0:1.6.7-3.el7_9 | | `libX11-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 0:1.6.7-3.el7_9 | | `libX11-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:1.6.7-3.el7_9 | | `libX11-debuginfo` | Red Hat:enterprise_linux:7::computenode | All versions | 0:1.6.7-3.el7_9 | | `libX11-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:1.6.7-3.el7_9 | | `libX11` | Red Hat:enterprise_linux:7::server | All versions | 0:1.6.7-3.el7_9 | | `libX11-common` | Red Hat:enterprise_linux:7::server | All versions | 0:1.6.7-3.el7_9 | | `libX11-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:1.6.7-3.el7_9 | | `libX11-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:1.6.7-3.el7_9 | | `libX11` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.6.7-3.el7_9 | | `libX11-common` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.6.7-3.el7_9 | | `libX11-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.6.7-3.el7_9 | | `libX11-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.6.7-3.el7_9 | | `libX11` | SUSE:Enterprise Storage 5 | All versions | 1.6.2-12.15.1 | | `libX11` | SUSE:HPE Helion OpenStack 8 | All versions | 1.6.2-12.15.1 | | `libX11` | SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 1.6.5-3.12.1 | | `libX11` | SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 1.6.5-3.12.1 | | `libX11` | SUSE:Linux Enterprise Module for Basesystem 15 SP1 | All versions | 1.6.5-3.12.1 | | `libX11` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 1.6.5-3.12.1 | | `libX11` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 1.6.2-12.15.1 | | `libX11` | SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 1.6.2-12.15.1 | | `libX11` | SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 1.6.2-12.15.1 | | `libX11` | SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 1.6.2-12.15.1 | Products: Fedoraproject Fedora, X.org Libx11. ## How do I fix CVE-2020-14363? Apply the vendor's patch. ## Is CVE-2020-14363 being exploited? There is no known exploitation of CVE-2020-14363 in the wild and no public exploit code. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2020-14363 and fix it if it is affected. What it is: CVE-2020-14363 is a high-severity use after free vulnerability in Fedoraproject Fedora, published on 11 Sep 2020. 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-2020-14363 in the wild and no public exploit code. Affected product: Fedoraproject Fedora. 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-2020-14363/ (Markdown: https://insights.sbomify.com/CVE-2020-14363/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-14363 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-14363 - OSV: https://osv.dev/vulnerability/CVE-2020-14363 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-14363/ Summaries are generated and may contain mistakes; the official description above is the record.