CVE-2023-50387 (GCVE-0-2023-50387)
Vulnerability from cvelistv5 – Published: 2024-02-14 00:00 – Updated: 2025-11-04 18:20
VLAI
EPSS
VEX
Summary
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-08 17:27 UTC
CWE
- n/a
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
36 references
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"descriptions": "[{\"lang\": \"en\", \"value\": \"Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the \\\"KeyTrap\\\" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.\"}, {\"lang\": \"es\", \"value\": \"Ciertos aspectos DNSSEC del protocolo DNS (en RFC 4035 y RFC relacionados) permiten a atacantes remotos provocar una denegaci\\u00f3n de servicio (consumo de CPU) a trav\\u00e9s de una o m\\u00e1s respuestas DNSSEC cuando hay una zona con muchos registros DNSKEY y RRSIG, tambi\\u00e9n conocido como \\\"KeyTrap\\\". \\\" asunto. La especificaci\\u00f3n del protocolo implica que un algoritmo debe evaluar todas las combinaciones de registros DNSKEY y RRSIG.\"}]",
"id": "CVE-2023-50387",
"lastModified": "2024-11-21T08:36:56.937",
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"published": "2024-02-14T16:15:45.300",
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"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-770\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2023-50387\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2024-02-14T16:15:45.300\",\"lastModified\":\"2026-06-17T06:39:35.510\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the \\\"KeyTrap\\\" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.\"},{\"lang\":\"es\",\"value\":\"Ciertos aspectos DNSSEC del protocolo DNS (en RFC 4035 y RFC relacionados) permiten a atacantes remotos provocar una denegaci\u00f3n de servicio (consumo de CPU) a trav\u00e9s de una o m\u00e1s respuestas DNSSEC cuando hay una zona con muchos registros DNSKEY y RRSIG, tambi\u00e9n conocido como \\\"KeyTrap\\\". \\\" asunto. 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"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-04-22T16:35:42+00:00",
"cve": "CVE-2023-50387",
"id": "CVE-2023-50387",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:fixed": "4008",
"product_status:known_not_affected": "115",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-50387.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-08-29T02:12:48Z",
"cve": "CVE-2023-50387",
"id": "CVE-2023-50387",
"initial_release_date": "2024-02-14T03:57:18Z",
"product_status:known_affected": "535",
"product_status:known_not_affected": "94",
"product_status:recommended": "755",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2023-50387",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-50387.json",
"version": "83"
},
"vulnrichment": {
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20240221 [SECURITY] [DLA 3736-1] unbound security update\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/\", \"name\": \"FEDORA-2024-b0f9656a76\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/\", \"name\": \"FEDORA-2024-4e36df9dfd\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/\", \"name\": \"FEDORA-2024-499b9be35f\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/\", \"name\": \"FEDORA-2024-c36c448396\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/\", \"name\": \"FEDORA-2024-c967c7d287\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/\", \"name\": \"FEDORA-2024-e00eceb11c\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/\", \"name\": \"FEDORA-2024-fae88b73eb\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240307-0007/\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html\", \"name\": \"[debian-lts-announce] 20240517 [SECURITY] [DLA 3816-1] bind9 security update\", \"tags\": [\"mailing-list\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the \\\"KeyTrap\\\" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"n/a\"}]}], \"providerMetadata\": {\"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\", \"dateUpdated\": \"2024-06-10T16:14:16.780Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2023-50387\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T18:20:34.949Z\", \"dateReserved\": \"2023-12-07T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2024-02-14T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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