# CVE-2021-45444: zsh: The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor CVE-2021-45444 is fixed in 6 products on 1 platform, first by zsh 5.4.2-3ubuntu3.2, released February 14, 2022. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2021-45444 - Priority: High - CVSS: 7.8 (Moderate) - EPSS: 0.0198 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Feb 14, 2022 ## Description The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more. Security Fix(es): * zsh: Prompt expansion vulnerability (CVE-2021-45444) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.6 Release Notes linked from the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | zsh Debian 11.6 (bullseye) | 5.8-6+deb11u1 | [DSA-5078-1](https://patchblox.com/security/data/fix/linux/dsa-5078-1.md) | Feb 16, 2022 | | Linux | zsh Debian 12.15 (bookworm) | 5.8.1-1 | [DEBIAN-CVE-2021-45444](https://patchblox.com/security/data/fix/linux/debian-cve-2021-45444.md) | Feb 14, 2022 | | Linux | zsh Debian 13.5 (trixie) | 5.8.1-1 | [DEBIAN-CVE-2021-45444](https://patchblox.com/security/data/fix/linux/debian-cve-2021-45444.md) | Feb 14, 2022 | | Linux | zsh Debian 14 | 5.8.1-1 | [DEBIAN-CVE-2021-45444](https://patchblox.com/security/data/fix/linux/debian-cve-2021-45444.md) | Feb 14, 2022 | | Linux | zsh RHEL 8 | 0:5.5.1-9.el8 | [RHSA-2022:2120](https://patchblox.com/security/data/fix/linux/rhsa-2022-2120.md) | May 10, 2022 | | Linux | zsh Ubuntu 18.04.6 LTS (bionic) | 5.4.2-3ubuntu3.2 | [zsh 5.4.2-3ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zsh-5.4.2-3ubuntu3.2.md) | Feb 14, 2022 | | Linux | zsh Ubuntu 20.04 LTS (focal) | 5.8-3ubuntu1.1 | [zsh 5.8-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zsh-5.8-3ubuntu1.1.md) | Feb 14, 2022 | | Linux | zsh almalinux 8 | 5.5.1-9.el8 | [ALSA-2022:2120](https://patchblox.com/security/data/fix/linux/alsa-2022-2120.md) | May 10, 2022 | | Linux | zsh amzn 2023 | 5.8.1-1.amzn2023.0.3 | [ALAS2023-2023-035](https://patchblox.com/security/data/fix/linux/alas2023-2023-035.md) | Feb 17, 2023 | | Linux | zsh ol 8 | 0:5.5.1-9.el8 | [ELSA-2022-2120](https://patchblox.com/security/data/fix/linux/elsa-2022-2120.md) | May 17, 2022 | | Linux | zsh rocky 8 | 0:5.5.1-9.el8 | [RLSA-2022:2120](https://patchblox.com/security/data/fix/linux/rlsa-2022-2120.md) | May 10, 2022 | | Linux | zsh-common Ubuntu 18.04.6 LTS (bionic) | 5.4.2-3ubuntu3.2 | [zsh-common 5.4.2-3ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zsh-common-5.4.2-3ubuntu3.2.md) | Feb 14, 2022 | | Linux | zsh-common Ubuntu 20.04 LTS (focal) | 5.8-3ubuntu1.1 | [zsh-common 5.8-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zsh-common-5.8-3ubuntu1.1.md) | Feb 14, 2022 | | Linux | zsh-debuginfo amzn 2023 | 5.8.1-1.amzn2023.0.3 | [ALAS2023-2023-035](https://patchblox.com/security/data/fix/linux/alas2023-2023-035.md) | Feb 17, 2023 | | Linux | zsh-debugsource amzn 2023 | 5.8.1-1.amzn2023.0.3 | [ALAS2023-2023-035](https://patchblox.com/security/data/fix/linux/alas2023-2023-035.md) | Feb 17, 2023 | | Linux | zsh-html RHEL 8 | 0:5.5.1-9.el8 | [RHSA-2022:2120](https://patchblox.com/security/data/fix/linux/rhsa-2022-2120.md) | May 10, 2022 | | Linux | zsh-html almalinux 8 | 5.5.1-9.el8 | [ALSA-2022:2120](https://patchblox.com/security/data/fix/linux/alsa-2022-2120.md) | May 10, 2022 | | Linux | zsh-html amzn 2023 | 5.8.1-1.amzn2023.0.3 | [ALAS2023-2023-035](https://patchblox.com/security/data/fix/linux/alas2023-2023-035.md) | Feb 17, 2023 | | Linux | zsh-html ol 8 | 0:5.5.1-9.el8 | [ELSA-2022-2120](https://patchblox.com/security/data/fix/linux/elsa-2022-2120.md) | May 17, 2022 | | Linux | zsh-static Ubuntu 18.04.6 LTS (bionic) | 5.4.2-3ubuntu3.2 | [zsh-static 5.4.2-3ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zsh-static-5.4.2-3ubuntu3.2.md) | Feb 14, 2022 | | Linux | zsh-static Ubuntu 20.04 LTS (focal) | 5.8-3ubuntu1.1 | [zsh-static 5.8-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zsh-static-5.8-3ubuntu1.1.md) | Feb 14, 2022 | --- Data as of 2026-11-09T01:18:40Z UTC. 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