{"containers":{"cna":{"affected":[{"product":"dnsmasq","vendor":"n/a","versions":[{"status":"affected","version":"dnsmasq 2.83"}]}],"descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-358","description":"CWE-358","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2022-01-25T13:52:14.000Z","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat"},"references":[{"tags":["x_refsource_MISC"],"url":"https://www.jsof-tech.com/disclosures/dnspooq/"},{"tags":["x_refsource_MISC"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1890125"},{"name":"FEDORA-2021-84440e87ba","tags":["vendor-advisory","x_refsource_FEDORA"],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/"},{"name":"GLSA-202101-17","tags":["vendor-advisory","x_refsource_GENTOO"],"url":"https://security.gentoo.org/glsa/202101-17"},{"name":"DSA-4844","tags":["vendor-advisory","x_refsource_DEBIAN"],"url":"https://www.debian.org/security/2021/dsa-4844"},{"name":"FEDORA-2021-2e4c3d5a9d","tags":["vendor-advisory","x_refsource_FEDORA"],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"},{"tags":["x_refsource_MISC"],"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"secalert@redhat.com","ID":"CVE-2020-25686","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 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."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-358"}]}]},"references":{"reference_data":[{"name":"https://www.jsof-tech.com/disclosures/dnspooq/","refsource":"MISC","url":"https://www.jsof-tech.com/disclosures/dnspooq/"},{"name":"https://bugzilla.redhat.com/show_bug.cgi?id=1890125","refsource":"MISC","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1890125"},{"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":"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":[{"tags":["x_refsource_MISC","x_transferred"],"url":"https://www.jsof-tech.com/disclosures/dnspooq/"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1890125"},{"name":"FEDORA-2021-84440e87ba","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/"},{"name":"GLSA-202101-17","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"],"url":"https://security.gentoo.org/glsa/202101-17"},{"name":"DSA-4844","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred"],"url":"https://www.debian.org/security/2021/dsa-4844"},{"name":"FEDORA-2021-2e4c3d5a9d","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61"},{"url":"https://www.kb.cert.org/vuls/id/434904"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-04T19:12:14.331Z"}}]},"cveMetadata":{"assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","assignerShortName":"redhat","cveId":"CVE-2020-25686","datePublished":"2021-01-20T16:47:17.000Z","dateReserved":"2020-09-16T00:00:00.000Z","dateUpdated":"2025-11-04T19:12:14.331Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"}