{"id":"ALPINE-CVE-2020-25684","details":"A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.","modified":"2026-03-09T01:17:20.722324Z","published":"2021-01-20T16:15:14.163Z","upstream":["CVE-2020-25684"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2020-25684"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.10","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.11","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4","2.80-r5"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4","2.80-r5","2.81-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4","2.80-r5","2.81-r0","2.81-r1","2.82-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4","2.80-r5","2.81-r0","2.81-r1","2.82-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2020-25684.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}