# CVE-2020-12403: nss: Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-... CVE-2020-12403 is fixed in 12 products on 1 platform, first by libnss3 2:3.35-2ubuntu2.12, released August 17, 2020. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2020-12403 - Priority: High - CVSS: 9.1 (Moderate) - EPSS: 0.0154 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 17, 2020 ## 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: Side channel attack on ECDSA signature generation (CVE-2020-6829) * nss: P-384 and P-521 implementation uses a side-channel vulnerable modular inversion function (CVE-2020-12400) * nss: CHACHA20-POLY1305 decryption with undersized tag leads to out-of-bounds read (CVE-2020-12403) 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. Bug Fix(es): * Support key wrap/unwrap with RSA-OAEP (BZ#1896431) * 1536bit group from RFC3526 is allowed in FIPS mode when in policy DH-MIN is set to be lower than 1536 (BZ#1896432) * when NSS_SDB_USE_CACHE not set, after curl access https, dentry increase but never released - consider alternative algorithm for benchmarking ACCESS call in sdb_measureAccess [rhel-8] (BZ#1896933) * Policy should allow overriding library defaults (BZ#1898702) * KDF-self-tests-induced changes for nss in RHEL 8.4 (BZ#1898953) * nss: non-blocksize requests to IKEv1 KDF returns bogus output (BZ#1904408) ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libnss3 Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.12 | [libnss3 2:3.35-2ubuntu2.12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-2-3.35-2ubuntu2.12.md) | Aug 17, 2020 | | Linux | libnss3 Ubuntu 20.04 LTS (focal) | 2:3.49.1-1ubuntu1.5 | [libnss3 2:3.49.1-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnss3-2-3.49.1-1ubuntu1.5.md) | Aug 17, 2020 | | Linux | libnss3-tools Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.12 | [libnss3-tools 2:3.35-2ubuntu2.12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-tools-2-3.35-2ubuntu2.12.md) | Aug 17, 2020 | | Linux | libnss3-tools Ubuntu 20.04 LTS (focal) | 2:3.49.1-1ubuntu1.5 | [libnss3-tools 2:3.49.1-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnss3-tools-2-3.49.1-1ubuntu1.5.md) | Aug 17, 2020 | | Linux | nss RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-devel RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-devel ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-softokn RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-softokn ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-softokn-devel RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-softokn-devel ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-softokn-freebl RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-softokn-freebl ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-softokn-freebl-devel RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-softokn-freebl-devel ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-sysinit RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-sysinit ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-tools RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-tools ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-util RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-util ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | | Linux | nss-util-devel RHEL 8 | 0:3.53.1-17.el8_3 | [RHSA-2021:0538](https://patchblox.com/security/data/fix/linux/rhsa-2021-0538.md) | Feb 16, 2021 | | Linux | nss-util-devel ol 8 | 0:3.53.1-17.el8_3 | [ELSA-2021-0538](https://patchblox.com/security/data/fix/linux/elsa-2021-0538.md) | Feb 17, 2021 | --- Data as of 2026-11-08T00:53:09Z UTC. 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