# CVE-2021-43527: nss-sysinit: Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-... CVE-2021-43527 is fixed in 29 products on 1 platform, first by DSA-5016-1, released December 1, 2021. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2021-43527 - Priority: Urgent - CVSS: 9.8 (Critical) - EPSS: 0.1756 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Dec 1, 2021 ## Description Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-enabled client and server applications. Security Fix(es): * nss: Memory corruption in decodeECorDsaSignature with DSA signatures (and RSA-PSS) (CVE-2021-43527) 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libnss3 Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.13 | [libnss3 2:3.35-2ubuntu2.13](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-2-3.35-2ubuntu2.13.md) | Dec 1, 2021 | | Linux | libnss3 Ubuntu 20.04 LTS (focal) | 2:3.49.1-1ubuntu1.6 | [libnss3 2:3.49.1-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnss3-2-3.49.1-1ubuntu1.6.md) | Dec 1, 2021 | | Linux | libnss3 Ubuntu 22.04.1 LTS (jammy) | 2:3.68-1ubuntu2 | [libnss3 2:3.68-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libnss3-2-3.68-1ubuntu2.md) | Dec 1, 2021 | | Linux | libnss3-tools Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.13 | [libnss3-tools 2:3.35-2ubuntu2.13](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-tools-2-3.35-2ubuntu2.13.md) | Dec 1, 2021 | | Linux | libnss3-tools Ubuntu 20.04 LTS (focal) | 2:3.49.1-1ubuntu1.6 | [libnss3-tools 2:3.49.1-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnss3-tools-2-3.49.1-1ubuntu1.6.md) | Dec 1, 2021 | | Linux | libnss3-tools Ubuntu 22.04.1 LTS (jammy) | 2:3.68-1ubuntu2 | [libnss3-tools 2:3.68-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libnss3-tools-2-3.68-1ubuntu2.md) | Dec 1, 2021 | | Linux | nspr amzn 2023 | 4.35.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nspr-debuginfo amzn 2023 | 4.35.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nspr-devel amzn 2023 | 4.35.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss Debian 11.6 (bullseye) | 2:3.61-1+deb11u1 | [DSA-5016-1](https://patchblox.com/security/data/fix/linux/dsa-5016-1.md) | Dec 1, 2021 | | Linux | nss Debian 12.15 (bookworm) | 2:3.73-1 | [DEBIAN-CVE-2021-43527](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43527.md) | Dec 8, 2021 | | Linux | nss Debian 13.5 (trixie) | 2:3.73-1 | [DEBIAN-CVE-2021-43527](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43527.md) | Dec 8, 2021 | | Linux | nss Debian 14 | 2:3.73-1 | [DEBIAN-CVE-2021-43527](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43527.md) | Dec 8, 2021 | | Linux | nss RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss rocky 8 | 0:3.67.0-7.el8_5 | [RLSA-2021:4903](https://patchblox.com/security/data/fix/linux/rlsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-debuginfo amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-debugsource amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-devel RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-devel almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-devel amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-devel ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-pkcs11-devel amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-softokn RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-softokn ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-debuginfo amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-softokn-devel RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-devel almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-devel amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-softokn-devel ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-freebl RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-freebl almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-freebl amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-softokn-freebl ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-freebl-debuginfo amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-softokn-freebl-devel RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-freebl-devel almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-softokn-freebl-devel amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-softokn-freebl-devel ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-sysinit RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-sysinit almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-sysinit amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-sysinit ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-sysinit-debuginfo amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-tools RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-tools almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-tools amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-tools ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-tools-debuginfo amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-util RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-util almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-util amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-util ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-util-debuginfo amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-util-devel RHEL 8 | 0:3.67.0-7.el8_5 | [RHSA-2021:4903](https://patchblox.com/security/data/fix/linux/rhsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-util-devel almalinux 8 | 3.67.0-7.el8_5 | [ALSA-2021:4903](https://patchblox.com/security/data/fix/linux/alsa-2021-4903.md) | Dec 1, 2021 | | Linux | nss-util-devel amzn 2023 | 3.83.0-1.amzn2023.0.2 | [ALAS2023-2023-031](https://patchblox.com/security/data/fix/linux/alas2023-2023-031.md) | Feb 17, 2023 | | Linux | nss-util-devel ol 8 | 0:3.67.0-7.el8_5 | [ELSA-2021-4903](https://patchblox.com/security/data/fix/linux/elsa-2021-4903.md) | Dec 1, 2021 | | Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:78.14.0+build1-0ubuntu0.18.04.2 | [thunderbird 1:78.14.0+build1-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-78.14.0-build1-0ubuntu0.18.04.2.md) | Dec 1, 2021 | | Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:78.14.0+build1-0ubuntu0.20.04.2 | [thunderbird 1:78.14.0+build1-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-78.14.0-build1-0ubuntu0.20.04.2.md) | Dec 1, 2021 | | Linux | thunderbird Ubuntu 22.04.1 LTS (jammy) | 1:91.4.0+build1.1-0ubuntu1 | [thunderbird 1:91.4.0+build1.1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-1-91.4.0-build1.1-0ubuntu1.md) | Dec 1, 2021 | | Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:78.14.0+build1-0ubuntu0.18.04.2 | [thunderbird-gnome-support 1:78.14.0+build1-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-78.14.0-build1-0ubuntu0.18.04.2.md) | Dec 1, 2021 | | Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:78.14.0+build1-0ubuntu0.20.04.2 | [thunderbird-gnome-support 1:78.14.0+build1-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-78.14.0-build1-0ubuntu0.20.04.2.md) | Dec 1, 2021 | | Linux | thunderbird-gnome-support Ubuntu 22.04.1 LTS (jammy) | 1:91.4.0+build1.1-0ubuntu1 | [thunderbird-gnome-support 1:91.4.0+build1.1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-gnome-support-1-91.4.0-build1.1-0ubuntu1.md) | Dec 1, 2021 | | Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:78.14.0+build1-0ubuntu0.18.04.2 | [thunderbird-mozsymbols 1:78.14.0+build1-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-78.14.0-build1-0ubuntu0.18.04.2.md) | Dec 1, 2021 | | Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:78.14.0+build1-0ubuntu0.20.04.2 | [thunderbird-mozsymbols 1:78.14.0+build1-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-78.14.0-build1-0ubuntu0.20.04.2.md) | Dec 1, 2021 | | Linux | thunderbird-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 1:91.4.0+build1.1-0ubuntu1 | [thunderbird-mozsymbols 1:91.4.0+build1.1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-mozsymbols-1-91.4.0-build1.1-0ubuntu1.md) | Dec 1, 2021 | | Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:78.14.0+build1-0ubuntu0.18.04.2 | [xul-ext-calendar-timezones 1:78.14.0+build1-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-78.14.0-build1-0ubuntu0.18.04.2.md) | Dec 1, 2021 | | Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:78.14.0+build1-0ubuntu0.20.04.2 | [xul-ext-calendar-timezones 1:78.14.0+build1-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-78.14.0-build1-0ubuntu0.20.04.2.md) | Dec 1, 2021 | | Linux | xul-ext-calendar-timezones Ubuntu 22.04.1 LTS (jammy) | 1:91.4.0+build1.1-0ubuntu1 | [xul-ext-calendar-timezones 1:91.4.0+build1.1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-calendar-timezones-1-91.4.0-build1.1-0ubuntu1.md) | Dec 1, 2021 | | Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:78.14.0+build1-0ubuntu0.18.04.2 | [xul-ext-gdata-provider 1:78.14.0+build1-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-78.14.0-build1-0ubuntu0.18.04.2.md) | Dec 1, 2021 | | Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:78.14.0+build1-0ubuntu0.20.04.2 | [xul-ext-gdata-provider 1:78.14.0+build1-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-78.14.0-build1-0ubuntu0.20.04.2.md) | Dec 1, 2021 | | Linux | xul-ext-gdata-provider Ubuntu 22.04.1 LTS (jammy) | 1:91.4.0+build1.1-0ubuntu1 | [xul-ext-gdata-provider 1:91.4.0+build1.1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-gdata-provider-1-91.4.0-build1.1-0ubuntu1.md) | Dec 1, 2021 | | Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:78.14.0+build1-0ubuntu0.18.04.2 | [xul-ext-lightning 1:78.14.0+build1-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-78.14.0-build1-0ubuntu0.18.04.2.md) | Dec 1, 2021 | | Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:78.14.0+build1-0ubuntu0.20.04.2 | [xul-ext-lightning 1:78.14.0+build1-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-78.14.0-build1-0ubuntu0.20.04.2.md) | Dec 1, 2021 | | Linux | xul-ext-lightning Ubuntu 22.04.1 LTS (jammy) | 1:91.4.0+build1.1-0ubuntu1 | [xul-ext-lightning 1:91.4.0+build1.1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-lightning-1-91.4.0-build1.1-0ubuntu1.md) | Dec 1, 2021 | --- Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.