High
Security advisory
An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5. A remote attacker can cause the cached records for a given name to be updated to the Bogus DNSSEC validation state, instead of their actual DNSSEC Secure state, via a DNS ANY query. This results in a denial of service for installation that always validate (dnssec=validate), and for clients requesting validation when on-demand validation is enabled (dnssec=process).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-25829
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:29 UTC · Revision 1
Source evidence
An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5. A remote attacker can cause the cached records for a given name to be updated to the Bogus DNSSEC validation state, instead of their actual DNSSEC Secure state, via a DNS ANY query. This results in a denial of service for installation that always validate (dnssec=validate), and for clients requesting validation when on-demand validation is enabled (dnssec=process).
osv:CVE-2020-25829
Complete source record
{
"id": "6c5d4742d3cd117821edb903e04b6d73ffc54c1f8023ef330b9035160635e495",
"url": "https://osv.dev/vulnerability/CVE-2020-25829",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-25829",
"summary": "An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5. A remote attacker can cause the cached records for a given name to be updated to the Bogus DNSSEC validation state, instead of their actual DNSSEC Secure state, via a DNS ANY query. This results in a denial of service for installation that always validate (dnssec=validate), and for clients requesting validation when on-demand validation is enabled (dnssec=process).",
"evidence": "osv:CVE-2020-25829",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-25829",
"aliases": [
"CVE-2020-25829"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/powerdns/pdns",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "77409aab0be43071b365760213894d6388c3df30"
},
{
"introduced": "2e63a37703ddea61f037c312341d364224130e16"
},
{
"fixed": "70b6d0d36de2489f68772da4ea59df5343a1dfd1"
},
{
"introduced": "f8e019026f5a1eff4b56a90a39c4acac95ae9dc4"
},
{
"fixed": "d37778a458510dd137916d752f6341c8063d09ea"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.1.18"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.2.0"
},
{
"fixed": "4.2.5"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.3.0"
},
{
"fixed": "4.3.5"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"rec-4.1.17",
"rec-4.3.4",
"rec-4.2.4",
"rec-4.3.3",
"rec-4.2.3",
"rec-4.3.2",
"rec-4.1.16",
"rec-4.2.2",
"rec-4.3.1",
"rec-4.3.0",
"rec-4.1.15",
"rec-4.2.1",
"rec-4.1.14",
"rec-4.2.0",
"rec-4.1.13",
"rec-4.1.12",
"rec-4.1.11",
"rec-4.1.10",
"rec-4.1.9",
"rec-4.1.8",
"rec-4.1.7",
"rec-4.1.6",
"rec-4.1.5",
"rec-4.1.4",
"rec-4.1.3",
"rec-4.1.2",
"rec-4.1.1",
"dnsdist-1.2.0",
"auth-4.1.0",
"rec-4.1.0",
"rec-4.1.0-rc3",
"auth-4.1.0-rc3",
"auth-4.1.0-rc2",
"rec-4.1.0-rc2",
"rec-4.1.0-rc1",
"auth-4.1.0-rc1",
"rec-4.1.0-alpha1",
"dnsdist-1.1.0",
"dnsdist-1.1.0-beta2",
"dnsdist-1.1.0-beta1",
"rec-4.0.2",
"rec-4.0.1",
"auth-4.0.1",
"rec-4.0.0",
"auth-4.0.0",
"auth-4.0.0-rc1",
"auth-4.0.0-rc2",
"rec-4.0.0-rc1",
"rec-4.0.0-beta1",
"auth-4.0.0-beta1",
"auth-4.0.0-alpha3",
"rec-4.0.0-alpha3",
"dnsdist-1.0.0",
"dnsdist-1.0.0-beta1",
"rec-4.0.0-alpha2",
"auth-4.0.0-alpha2",
"dnsdist-1.0.0-alpha2",
"auth-4.0.0-alpha1",
"rec-4.0.0-alpha1",
"dnsdist-1.0.0-alpha1",
"auth-3.4.0",
"auth-3.4.0-rc2",
"rec-3.6.0",
"auth-3.4.0-rc1",
"rec-3.5",
"rec-3.5-rc5",
"rec-3.5-rc4",
"rec-3.5-rc3",
"rec-3.5-rc1",
"auth-3.2-rc4",
"auth-3.2-rc3",
"auth-3.2-rc2",
"auth-3.2-rc1",
"auth-3.1-rc3",
"auth-3.1-rc2",
"auth-3.1-rc1",
"rec-3.3.1",
"rec-3.1.4",
"rec-3.0.1",
"rec-3-0-1",
"rec-3.0",
"rec-3-0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-25829.json",
"vanir_signatures": [
{
"id": "CVE-2020-25829-ac387b1a",
"digest": {
"length": 729,
"function_hash": "77679631441445527983920042920211549080"
},
"source": "https://github.com/powerdns/pdns/commit/77409aab0be43071b365760213894d6388c3df30",
"target": {
"file": "pdns/recursor_cache.cc",
"function": "MemRecursorCache::updateValidationStatus"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-25829-e5cd83e1",
"digest": {
"threshold": 0.9,
"line_hashes": [
"47417538831777855470350430050715081350",
"148055263521903558314326114750883219758",
"35080228024880871007699290772856527215",
"67316773013314591480806366431856137347",
"117026657073042240224421905896698093643",
"323213353731232169172399806756170124246",
"155500896485175737294500301755246166961",
"224196667708172987418133306458664934984",
"144653575526639387313445865962482611461",
"103108929300239247840240085865274340062",
"32309045751000532166148983162358670769",
"252546257047801208426498952786257063949"
]
},
"source": "https://github.com/powerdns/pdns/commit/77409aab0be43071b365760213894d6388c3df30",
"target": {
"file": "pdns/recursor_cache.cc"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-24T14:50:58Z"
}
}
],
"modified": "2026-10-24T14:50:58.042462882Z",
"provider": "osv",
"references": [
"https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-07.html",
"https://security.gentoo.org/glsa/202012-19"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*",
"cpe:2.3:a:opensuse:backports_sle:15.0:sp2:*:*:*:*:*:*"
],
"vendor_product": "opensuse:backports_sle",
"extracted_events": [
{
"range": [
{
"introduced": "15.0-sp1"
},
{
"last_affected": "15.0-sp1"
},
{
"introduced": "15.0-sp2"
},
{
"last_affected": "15.0-sp2"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*",
"cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
},
{
"introduced": "15.2"
},
{
"last_affected": "15.2"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-25829",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 443840,
"published_at": "2020-10-16T06:15:12.357+00:00"
}