# CVE-2021-3672: Node.js 14 and 2 others: A flaw was found in c-ares library, where a missing input validation check of host names returned by… CVE-2021-3672 is fixed in 13 products on 2 platforms, first by libc-ares2 1.14.0-1ubuntu0.1, released August 9, 2021. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2021-3672 - Priority: Routine - CVSS: 5.6 (Important) - EPSS: 0.0281 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 9, 2021 - Weakness: CWE-79 - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-3672 ## Description A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Node.js 12 | 12.22.5 | [Node.js 12 12.22.5](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.12-12.22.5.md) | Aug 11, 2021 | | Windows apps | Node.js 14 | 14.17.5 | [Node.js 14 14.17.5](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.14-14.17.5.md) | Aug 11, 2021 | | Windows apps | Node.js 16 | 16.6.2 | [Node.js 16 16.6.2](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.16-16.6.2.md) | Aug 11, 2021 | | Linux | c-ares Debian 12.15 (bookworm) | 1.17.1-1.1 | [DEBIAN-CVE-2021-3672](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3672.md) | Nov 23, 2021 | | Linux | c-ares Debian 13.5 (trixie) | 1.17.1-1.1 | [DEBIAN-CVE-2021-3672](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3672.md) | Nov 23, 2021 | | Linux | c-ares Debian 14 | 1.17.1-1.1 | [DEBIAN-CVE-2021-3672](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3672.md) | Nov 23, 2021 | | Linux | c-ares RHEL 8 | 0:1.13.0-6.el8 | [RHSA-2022:2043](https://patchblox.com/security/data/fix/linux/rhsa-2022-2043.md) | May 10, 2022 | | Linux | c-ares almalinux 8 | 1.13.0-6.el8 | [ALSA-2022:2043](https://patchblox.com/security/data/fix/linux/alsa-2022-2043.md) | May 10, 2022 | | Linux | c-ares ol 8 | 0:1.13.0-6.el8 | [ELSA-2022-2043](https://patchblox.com/security/data/fix/linux/elsa-2022-2043.md) | May 17, 2022 | | Linux | c-ares rocky 8 | 0:1.13.0-6.el8 | [RLSA-2022:2043](https://patchblox.com/security/data/fix/linux/rlsa-2022-2043.md) | May 10, 2022 | | Linux | c-ares-devel RHEL 8 | 0:1.13.0-6.el8 | [RHSA-2022:2043](https://patchblox.com/security/data/fix/linux/rhsa-2022-2043.md) | May 10, 2022 | | Linux | c-ares-devel almalinux 8 | 1.13.0-6.el8 | [ALSA-2022:2043](https://patchblox.com/security/data/fix/linux/alsa-2022-2043.md) | May 10, 2022 | | Linux | c-ares-devel ol 8 | 0:1.13.0-6.el8 | [ELSA-2022-2043](https://patchblox.com/security/data/fix/linux/elsa-2022-2043.md) | May 17, 2022 | | Linux | libc-ares2 Ubuntu 18.04.6 LTS (bionic) | 1.14.0-1ubuntu0.1 | [libc-ares2 1.14.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc-ares2-1.14.0-1ubuntu0.1.md) | Aug 9, 2021 | | Linux | libc-ares2 Ubuntu 20.04 LTS (focal) | 1.15.0-1ubuntu0.1 | [libc-ares2 1.15.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc-ares2-1.15.0-1ubuntu0.1.md) | Aug 9, 2021 | | Linux | libc-ares2 Ubuntu 22.04.1 LTS (jammy) | 1.17.1-1ubuntu1 | [libc-ares2 1.17.1-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libc-ares2-1.17.1-1ubuntu1.md) | Aug 9, 2021 | | Linux | nodejs RHEL 8 | 1:14.17.5-1.module+el8.4.0+12247+e2879e58 | [RHSA-2021:3666](https://patchblox.com/security/data/fix/linux/rhsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs ol 8 | 1:14.17.5-1.module+el8.4.0+20313+f90c2973 | [ELSA-2021-3666](https://patchblox.com/security/data/fix/linux/elsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-devel RHEL 8 | 1:14.17.5-1.module+el8.4.0+12247+e2879e58 | [RHSA-2021:3666](https://patchblox.com/security/data/fix/linux/rhsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-devel ol 8 | 1:14.17.5-1.module+el8.4.0+20313+f90c2973 | [ELSA-2021-3666](https://patchblox.com/security/data/fix/linux/elsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-docs RHEL 8 | 1:14.17.5-1.module+el8.4.0+12247+e2879e58 | [RHSA-2021:3666](https://patchblox.com/security/data/fix/linux/rhsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-docs ol 8 | 1:14.17.5-1.module+el8.4.0+20313+f90c2973 | [ELSA-2021-3666](https://patchblox.com/security/data/fix/linux/elsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-full-i18n RHEL 8 | 1:14.17.5-1.module+el8.4.0+12247+e2879e58 | [RHSA-2021:3666](https://patchblox.com/security/data/fix/linux/rhsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-full-i18n ol 8 | 1:14.17.5-1.module+el8.4.0+20313+f90c2973 | [ELSA-2021-3666](https://patchblox.com/security/data/fix/linux/elsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-nodemon RHEL 8 | 0:2.0.3-1.module+el8.3.0+6519+9f98ed83 | [RHSA-2021:3666](https://patchblox.com/security/data/fix/linux/rhsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-nodemon ol 8 | 0:2.0.3-1.module+el8.3.0+7818+6cd30d85 | [ELSA-2021-3666](https://patchblox.com/security/data/fix/linux/elsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-packaging RHEL 8 | 0:23-3.module+el8.3.0+6519+9f98ed83 | [RHSA-2021:3666](https://patchblox.com/security/data/fix/linux/rhsa-2021-3666.md) | Sep 27, 2021 | | Linux | nodejs-packaging ol 8 | 0:23-3.module+el8.3.0+7818+6cd30d85 | [ELSA-2021-3666](https://patchblox.com/security/data/fix/linux/elsa-2021-3666.md) | Sep 27, 2021 | | Linux | npm RHEL 8 | 1:6.14.14-1.14.17.5.1.module+el8.4.0+12247+e2879e58 | [RHSA-2021:3666](https://patchblox.com/security/data/fix/linux/rhsa-2021-3666.md) | Sep 27, 2021 | | Linux | npm ol 8 | 1:6.14.14-1.14.17.5.1.module+el8.4.0+20313+f90c2973 | [ELSA-2021-3666](https://patchblox.com/security/data/fix/linux/elsa-2021-3666.md) | Sep 27, 2021 | --- Data as of 2026-11-08T06:59:42Z UTC. 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