{"id":"CVE-2020-25684","state":"PUBLISHED","title":"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","description":"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.","publishedAt":"2021-01-20T15:22:21.000Z","updatedAt":"2025-11-04T19:12:12.109Z","severity":null,"assigner":"redhat","products":["n/a dnsmasq"],"affected":[{"vendor":"n/a","product":"dnsmasq","versions":[{"version":"dnsmasq 2.83","status":"affected"}]}],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1889686","https://www.jsof-tech.com/disclosures/dnspooq/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/","https://security.gentoo.org/glsa/202101-17","https://www.debian.org/security/2021/dsa-4844","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/","https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html","https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61","https://www.kb.cert.org/vuls/id/434904"],"weaknesses":["CWE-358"],"ingestedAt":"2026-10-29T19:47:05.429Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/25xxx/CVE-2020-25684.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2020-25684","state":"PUBLISHED","datePublished":"2021-01-20T15:22:21.000Z","dateUpdated":"2025-11-04T19:12:12.109Z","assignerShortName":"redhat","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateReserved":"2020-09-16T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"dnsmasq","versions":[{"version":"dnsmasq 2.83","status":"affected"}]}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1889686","tags":["x_refsource_MISC"]},{"url":"https://www.jsof-tech.com/disclosures/dnspooq/","tags":["x_refsource_MISC"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/","name":"FEDORA-2021-84440e87ba","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://security.gentoo.org/glsa/202101-17","name":"GLSA-202101-17","tags":["vendor-advisory","x_refsource_GENTOO"]},{"url":"https://www.debian.org/security/2021/dsa-4844","name":"DSA-4844","tags":["vendor-advisory","x_refsource_DEBIAN"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/","name":"FEDORA-2021-2e4c3d5a9d","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html","name":"[debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-358","description":"CWE-358","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat","dateUpdated":"2022-01-25T13:52:07.000Z","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"secalert@redhat.com","ID":"CVE-2020-25684","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"dnsmasq","version":{"version_data":[{"version_value":"dnsmasq 2.83"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-358"}]}]},"references":{"reference_data":[{"name":"https://bugzilla.redhat.com/show_bug.cgi?id=1889686","refsource":"MISC","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1889686"},{"name":"https://www.jsof-tech.com/disclosures/dnspooq/","refsource":"MISC","url":"https://www.jsof-tech.com/disclosures/dnspooq/"},{"name":"FEDORA-2021-84440e87ba","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/"},{"name":"GLSA-202101-17","refsource":"GENTOO","url":"https://security.gentoo.org/glsa/202101-17"},{"name":"DSA-4844","refsource":"DEBIAN","url":"https://www.debian.org/security/2021/dsa-4844"},{"name":"FEDORA-2021-2e4c3d5a9d","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"},{"name":"[debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update","refsource":"MLIST","url":"https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html"},{"name":"https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61","refsource":"MISC","url":"https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1889686","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://www.jsof-tech.com/disclosures/dnspooq/","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/","name":"FEDORA-2021-84440e87ba","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"url":"https://security.gentoo.org/glsa/202101-17","name":"GLSA-202101-17","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]},{"url":"https://www.debian.org/security/2021/dsa-4844","name":"DSA-4844","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/","name":"FEDORA-2021-2e4c3d5a9d","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html","name":"[debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://www.kb.cert.org/vuls/id/434904"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-04T19:12:12.109Z"}}]}}}