# CVE-2019-17023: Firefox ESR: After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting… CVE-2019-17023 is fixed in 18 products on 2 platforms, first by firefox 72.0.1+build1-0ubuntu0.18.04.1, released January 8, 2020. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2019-17023 - Priority: Routine - CVSS: 6.5 (Moderate) - EPSS: 0.0134 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 8, 2020 - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-17023 ## Description After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox < 72. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Firefox ESR (en-US) | 78.0esr | [Mozilla Firefox ESR (en-US) 78.0esr](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-78.0esr.md) | Jun 25, 2020 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 72.0.1+build1-0ubuntu0.18.04.1 | [firefox 72.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-72.0.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 72.0.1+build1-0ubuntu1 | [firefox 72.0.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-72.0.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 72.0.1+build1-0ubuntu0.18.04.1 | [firefox-geckodriver 72.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-72.0.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 72.0.1+build1-0ubuntu1 | [firefox-geckodriver 72.0.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-72.0.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 72.0.1+build1-0ubuntu0.18.04.1 | [firefox-mozsymbols 72.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-72.0.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 72.0.1+build1-0ubuntu1 | [firefox-mozsymbols 72.0.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-72.0.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | libnss3 Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.8 | [libnss3 2:3.35-2ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-2-3.35-2ubuntu2.8.md) | May 25, 2020 | | Linux | libnss3-tools Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.8 | [libnss3-tools 2:3.35-2ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-tools-2-3.35-2ubuntu2.8.md) | May 25, 2020 | | Linux | nspr RHEL 8 | 0:4.25.0-2.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nspr ol 8 | 0:4.25.0-2.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nspr-devel RHEL 8 | 0:4.25.0-2.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nspr-devel ol 8 | 0:4.25.0-2.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-devel RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-devel ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-softokn RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-softokn ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-softokn-devel RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-softokn-devel ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-softokn-freebl RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-softokn-freebl ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-softokn-freebl-devel RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-softokn-freebl-devel ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-sysinit RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-sysinit ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-tools RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-tools ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-util RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-util ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | | Linux | nss-util-devel RHEL 8 | 0:3.53.1-11.el8_2 | [RHSA-2020:3280](https://patchblox.com/security/data/fix/linux/rhsa-2020-3280.md) | Aug 3, 2020 | | Linux | nss-util-devel ol 8 | 0:3.53.1-11.el8_2 | [ELSA-2020-3280](https://patchblox.com/security/data/fix/linux/elsa-2020-3280.md) | Aug 4, 2020 | --- Data as of 2026-11-07T12:40:37Z UTC. 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