{"id":"USN-5168-4","summary":"nss regression","details":"USN-5168-3 fixed a vulnerability in NSS. Unfortunately that update introduced\na regression that could break SSL connections. This update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Tavis Ormandy discovered that NSS incorrectly handled verifying DSA/RSA-PSS\n signatures. A remote attacker could use this issue to cause NSS to crash,\n resulting in a denial of service, or possibly execute arbitrary code.\n \n","modified":"2026-05-20T16:03:10.548950816Z","published":"2021-12-07T19:35:28Z","related":["UBUNTU-CVE-2021-43527"],"upstream":["CVE-2021-43527","UBUNTU-CVE-2021-43527"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5168-4"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-43527"}],"affected":[{"package":{"name":"nss","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/nss?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.28.4-0ubuntu0.14.04.5+esm10"}]}],"versions":["2:3.15.1-1ubuntu1","2:3.15.2-1","2:3.15.3-1","2:3.15.3.1-1","2:3.15.3.1-1.1","2:3.15.3.1-1.1ubuntu1","2:3.15.4-1ubuntu3","2:3.15.4-1ubuntu4","2:3.15.4-1ubuntu5","2:3.15.4-1ubuntu6","2:3.15.4-1ubuntu7","2:3.15.4-1ubuntu7.1","2:3.17-0ubuntu0.14.04.1","2:3.17.1-0ubuntu0.14.04.1","2:3.17.1-0ubuntu0.14.04.2","2:3.17.4-0ubuntu0.14.04.1","2:3.19.2-0ubuntu0.14.04.1","2:3.19.2.1-0ubuntu0.14.04.1","2:3.19.2.1-0ubuntu0.14.04.2","2:3.21-0ubuntu0.14.04.1","2:3.21-0ubuntu0.14.04.2","2:3.23-0ubuntu0.14.04.1","2:3.26.2-0ubuntu0.14.04.3","2:3.28.4-0ubuntu0.14.04.1","2:3.28.4-0ubuntu0.14.04.2","2:3.28.4-0ubuntu0.14.04.3","2:3.28.4-0ubuntu0.14.04.4","2:3.28.4-0ubuntu0.14.04.5","2:3.28.4-0ubuntu0.14.04.5+esm1","2:3.28.4-0ubuntu0.14.04.5+esm2","2:3.28.4-0ubuntu0.14.04.5+esm3","2:3.28.4-0ubuntu0.14.04.5+esm4","2:3.28.4-0ubuntu0.14.04.5+esm5","2:3.28.4-0ubuntu0.14.04.5+esm6","2:3.28.4-0ubuntu0.14.04.5+esm7","2:3.28.4-0ubuntu0.14.04.5+esm8","2:3.28.4-0ubuntu0.14.04.5+esm9"],"ecosystem_specific":{"binaries":[{"binary_version":"2:3.28.4-0ubuntu0.14.04.5+esm10","binary_name":"libnss3"},{"binary_version":"2:3.28.4-0ubuntu0.14.04.5+esm10","binary_name":"libnss3-1d"},{"binary_version":"2:3.28.4-0ubuntu0.14.04.5+esm10","binary_name":"libnss3-nssdb"},{"binary_version":"2:3.28.4-0ubuntu0.14.04.5+esm10","binary_name":"libnss3-tools"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5168-4.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2021-43527"}]}}},{"package":{"name":"nss","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/nss?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.28.4-0ubuntu0.16.04.14+esm2"}]}],"versions":["2:3.19.2-1ubuntu1","2:3.19.2.1-0ubuntu1","2:3.21-1ubuntu2","2:3.21-1ubuntu3","2:3.21-1ubuntu4","2:3.23-0ubuntu0.16.04.1","2:3.26.2-0ubuntu0.16.04.2","2:3.28.4-0ubuntu0.16.04.1","2:3.28.4-0ubuntu0.16.04.2","2:3.28.4-0ubuntu0.16.04.3","2:3.28.4-0ubuntu0.16.04.4","2:3.28.4-0ubuntu0.16.04.5","2:3.28.4-0ubuntu0.16.04.6","2:3.28.4-0ubuntu0.16.04.8","2:3.28.4-0ubuntu0.16.04.9","2:3.28.4-0ubuntu0.16.04.10","2:3.28.4-0ubuntu0.16.04.11","2:3.28.4-0ubuntu0.16.04.12","2:3.28.4-0ubuntu0.16.04.13","2:3.28.4-0ubuntu0.16.04.14","2:3.28.4-0ubuntu0.16.04.14+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"2:3.28.4-0ubuntu0.16.04.14+esm2","binary_name":"libnss3-nssdb"},{"binary_version":"2:3.28.4-0ubuntu0.16.04.14+esm2","binary_name":"libnss3"},{"binary_version":"2:3.28.4-0ubuntu0.16.04.14+esm2","binary_name":"libnss3-1d"},{"binary_name":"libnss3-tools","binary_version":"2:3.28.4-0ubuntu0.16.04.14+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5168-4.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2021-43527"}]}}}],"schema_version":"1.7.5"}