{"id":"UBUNTU-CVE-2020-5243","details":"uap-core before 0.7.3 is vulnerable to a denial of service attack when processing crafted User-Agent strings. Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This has been patched in uap-core 0.7.3.","modified":"2026-05-20T16:04:34.926977534Z","published":"2020-02-21T00:15:00Z","upstream":["CVE-2020-5243"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-5243"},{"type":"REPORT","url":"https://github.com/ua-parser/uap-core/commit/0afd61ed85396a3b5316f18bfd1edfaadf8e88e1"},{"type":"REPORT","url":"https://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9p"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-5243"}],"affected":[{"package":{"name":"uap-core","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/uap-core?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20190213-2"],"ecosystem_specific":{"binaries":[{"binary_name":"uap-core","binary_version":"20190213-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-5243.json"}},{"package":{"name":"uap-core","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/uap-core?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.12.0-1","1:0.13.0-1","1:0.14.0-1","1:0.15.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"uap-core","binary_version":"1:0.15.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-5243.json"}},{"package":{"name":"uap-core","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/uap-core?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.18.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"uap-core","binary_version":"1:0.18.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-5243.json"}},{"package":{"name":"uap-core","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/uap-core?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.18.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:0.18.0-1","binary_name":"uap-core"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-5243.json"}},{"package":{"name":"uap-core","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/uap-core?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.18.0-1","1:0.18.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:0.18.0-1build1","binary_name":"uap-core"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-5243.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H"},{"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":"medium"}]}