{"id":"CVE-2020-25686","details":"A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.","modified":"2026-03-15T22:35:07.485306Z","published":"2021-01-20T17:15:13Z","related":["MGASA-2021-0059","SUSE-SU-2021:0162-1","SUSE-SU-2021:0163-1","SUSE-SU-2021:0166-1","SUSE-SU-2021:14603-1","SUSE-SU-2021:14604-1","openSUSE-SU-2021:0124-1","openSUSE-SU-2021:0129-1","openSUSE-SU-2024:10721-1"],"references":[{"type":"WEB","url":"https://www.kb.cert.org/vuls/id/434904"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202101-17"},{"type":"ADVISORY","url":"https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4844"},{"type":"ADVISORY","url":"https://www.jsof-tech.com/disclosures/dnspooq/"},{"type":"FIX","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1890125"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"2.83"}]},{"events":[{"introduced":"0"},{"last_affected":"32"}]},{"events":[{"introduced":"0"},{"last_affected":"33"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]},{"events":[{"introduced":"4.21"},{"fixed":"4.21.14m"}]},{"events":[{"introduced":"4.22"},{"fixed":"4.22.9m"}]},{"events":[{"introduced":"4.23"},{"fixed":"4.23.7m"}]},{"events":[{"introduced":"4.24"},{"fixed":"4.24.5m"}]},{"events":[{"introduced":"4.25"},{"fixed":"4.25.2f"}]},{"events":[{"introduced":"0"},{"fixed":"2.83"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-25686.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}