{"id":"UBUNTU-CVE-2020-25648","details":"A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58.","modified":"2026-04-22T12:35:24.591476Z","published":"2020-10-20T22:15:00Z","related":["USN-5410-1"],"upstream":["CVE-2020-25648"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-25648"},{"type":"REPORT","url":"https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.58_release_notes"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5410-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-25648"}],"affected":[{"package":{"name":"nss","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/nss@2:3.35-2ubuntu2.14?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.35-2ubuntu2.14"}]}],"versions":["2:3.32-1ubuntu3","2:3.34-1ubuntu1","2:3.35-2ubuntu2","2:3.35-2ubuntu2.1","2:3.35-2ubuntu2.2","2:3.35-2ubuntu2.3","2:3.35-2ubuntu2.5","2:3.35-2ubuntu2.6","2:3.35-2ubuntu2.7","2:3.35-2ubuntu2.8","2:3.35-2ubuntu2.9","2:3.35-2ubuntu2.11","2:3.35-2ubuntu2.12","2:3.35-2ubuntu2.13"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2:3.35-2ubuntu2.14","binary_name":"libnss3"},{"binary_name":"libnss3-tools","binary_version":"2:3.35-2ubuntu2.14"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-25648.json"}},{"package":{"name":"nss","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/nss@2:3.49.1-1ubuntu1.7?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.49.1-1ubuntu1.7"}]}],"versions":["2:3.45-1ubuntu2","2:3.47-1ubuntu1","2:3.47-1ubuntu2","2:3.48-1ubuntu1","2:3.49.1-1ubuntu1","2:3.49.1-1ubuntu1.1","2:3.49.1-1ubuntu1.2","2:3.49.1-1ubuntu1.4","2:3.49.1-1ubuntu1.5","2:3.49.1-1ubuntu1.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2:3.49.1-1ubuntu1.7","binary_name":"libnss3"},{"binary_name":"libnss3-tools","binary_version":"2:3.49.1-1ubuntu1.7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-25648.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}