CVE-2020-25829

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).

References

Affected packages

Git / github.com/powerdns/pdns

Affected ranges

Type

GIT

Repo

https://github.com/powerdns/pdns

Events

Introduced

Fixed

77409aab0be43071b365760213894d6388c3df30

Introduced

2e63a37703ddea61f037c312341d364224130e16

Fixed

70b6d0d36de2489f68772da4ea59df5343a1dfd1

Introduced

f8e019026f5a1eff4b56a90a39c4acac95ae9dc4

Fixed

d37778a458510dd137916d752f6341c8063d09ea

Database specific

{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.1.18"
        },
        {
            "introduced": "4.2.0"
        },
        {
            "fixed": "4.2.5"
        },
        {
            "introduced": "4.3.0"
        },
        {
            "fixed": "4.3.5"
        }
    ]
}

Affected versions

auth-3.*

auth-3.1-rc1

auth-3.1-rc2

auth-3.1-rc3

auth-3.2-rc1

auth-3.2-rc2

auth-3.2-rc3

auth-3.2-rc4

auth-3.4.0

auth-3.4.0-rc1

auth-3.4.0-rc2

auth-4.*

auth-4.0.0

auth-4.0.0-alpha1

auth-4.0.0-alpha2

auth-4.0.0-alpha3

auth-4.0.0-beta1

auth-4.0.0-rc1

auth-4.0.0-rc2

auth-4.0.1

auth-4.1.0

auth-4.1.0-rc1

auth-4.1.0-rc2

auth-4.1.0-rc3

dnsdist-1.*

dnsdist-1.0.0

dnsdist-1.0.0-alpha1

dnsdist-1.0.0-alpha2

dnsdist-1.0.0-beta1

dnsdist-1.1.0

dnsdist-1.1.0-beta1

dnsdist-1.1.0-beta2

dnsdist-1.2.0

Other

rec-3-0

rec-3-0-1

rec-3.*

rec-3.0

rec-3.0.1

rec-3.1.4

rec-3.3.1

rec-3.5

rec-3.5-rc1

rec-3.5-rc3

rec-3.5-rc4

rec-3.5-rc5

rec-3.6.0

rec-4.*

rec-4.0.0

rec-4.0.0-alpha1

rec-4.0.0-alpha2

rec-4.0.0-alpha3

rec-4.0.0-beta1

rec-4.0.0-rc1

rec-4.0.1

rec-4.0.2

rec-4.1.0

rec-4.1.0-alpha1

rec-4.1.0-rc1

rec-4.1.0-rc2

rec-4.1.0-rc3

rec-4.1.1

rec-4.1.10

rec-4.1.11

rec-4.1.12

rec-4.1.13

rec-4.1.14

rec-4.1.15

rec-4.1.16

rec-4.1.17

rec-4.1.2

rec-4.1.3

rec-4.1.4

rec-4.1.5

rec-4.1.6

rec-4.1.7

rec-4.1.8

rec-4.1.9

rec-4.2.0

rec-4.2.1

rec-4.2.2

rec-4.2.3

rec-4.2.4

rec-4.3.0

rec-4.3.1

rec-4.3.2

rec-4.3.3

rec-4.3.4

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-25829.json"

vanir_signatures

[
    {
        "digest": {
            "length": 729.0,
            "function_hash": "77679631441445527983920042920211549080"
        },
        "id": "CVE-2020-25829-ac387b1a",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Function",
        "source": "https://github.com/powerdns/pdns/commit/77409aab0be43071b365760213894d6388c3df30",
        "target": {
            "function": "MemRecursorCache::updateValidationStatus",
            "file": "pdns/recursor_cache.cc"
        }
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "47417538831777855470350430050715081350",
                "148055263521903558314326114750883219758",
                "35080228024880871007699290772856527215",
                "67316773013314591480806366431856137347",
                "117026657073042240224421905896698093643",
                "323213353731232169172399806756170124246",
                "155500896485175737294500301755246166961",
                "224196667708172987418133306458664934984",
                "144653575526639387313445865962482611461",
                "103108929300239247840240085865274340062",
                "32309045751000532166148983162358670769",
                "252546257047801208426498952786257063949"
            ]
        },
        "id": "CVE-2020-25829-e5cd83e1",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Line",
        "source": "https://github.com/powerdns/pdns/commit/77409aab0be43071b365760213894d6388c3df30",
        "target": {
            "file": "pdns/recursor_cache.cc"
        }
    }
]

vanir_signatures_modified

"2026-04-11T11:23:25Z"

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "15.0-sp1"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "15.0-sp2"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "15.1"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "15.2"
            }
        ]
    }
]