{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "state": "PUBLISHED",
        "cveId": "CVE-2020-25685",
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "dateUpdated": "2025-11-04T19:12:13.209Z",
        "dateReserved": "2020-09-16T00:00:00.000Z",
        "datePublished": "2021-01-20T00:00:00.000Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
                "shortName": "redhat",
                "dateUpdated": "2022-10-07T00:00:00.000Z"
            },
            "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 forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. 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."
                }
            ],
            "affected": [
                {
                    "vendor": "n/a",
                    "product": "dnsmasq",
                    "versions": [
                        {
                            "version": "dnsmasq 2.83",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://www.jsof-tech.com/disclosures/dnspooq/"
                },
                {
                    "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1889688"
                },
                {
                    "name": "FEDORA-2021-84440e87ba",
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/"
                },
                {
                    "name": "GLSA-202101-17",
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://security.gentoo.org/glsa/202101-17"
                },
                {
                    "name": "DSA-4844",
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://www.debian.org/security/2021/dsa-4844"
                },
                {
                    "name": "FEDORA-2021-2e4c3d5a9d",
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"
                },
                {
                    "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61"
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "type": "CWE",
                            "lang": "en",
                            "description": "CWE-326",
                            "cweId": "CWE-326"
                        }
                    ]
                }
            ]
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "https://www.jsof-tech.com/disclosures/dnspooq/",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1889688",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "name": "FEDORA-2021-84440e87ba",
                        "tags": [
                            "vendor-advisory",
                            "x_transferred"
                        ],
                        "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/"
                    },
                    {
                        "name": "GLSA-202101-17",
                        "tags": [
                            "vendor-advisory",
                            "x_transferred"
                        ],
                        "url": "https://security.gentoo.org/glsa/202101-17"
                    },
                    {
                        "name": "DSA-4844",
                        "tags": [
                            "vendor-advisory",
                            "x_transferred"
                        ],
                        "url": "https://www.debian.org/security/2021/dsa-4844"
                    },
                    {
                        "name": "FEDORA-2021-2e4c3d5a9d",
                        "tags": [
                            "vendor-advisory",
                            "x_transferred"
                        ],
                        "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"
                    },
                    {
                        "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://www.kb.cert.org/vuls/id/434904"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2025-11-04T19:12:13.209Z"
                }
            }
        ]
    }
}