{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45557", "assignerOrgId": "9119a7d8-5eab-497f-8521-727c672e3725", "state": "PUBLISHED", "assignerShortName": "cisa-cg", "dateReserved": "2026-05-12T18:08:43.759Z", "datePublished": "2026-05-19T13:47:47.291Z", "dateUpdated": "2026-05-19T14:57:56.327Z"}, "containers": {"cna": {"descriptions": [{"lang": "en", "value": "Technitium DNS Server aggressively tries to fetch missing RRSIG records or mismatched DNSKEY records. An attacker in control of a domain can cause a vulnerable system to generate excessive network traffic. Fixed in 15.0."}], "affected": [{"vendor": "Technitium", "product": "DNS Server", "defaultStatus": "unknown", "versions": [{"version": "0", "status": "affected", "lessThan": "15.0", "versionType": "custom"}, {"version": "15.0", "status": "unaffected"}]}], "problemTypes": [{"descriptions": [{"description": "CWE-405 Asymmetric Resource Consumption (Amplification)", "lang": "en", "type": "CWE", "cweId": "CWE-405"}]}, {"descriptions": [{"description": "CWE-406 Insufficient Control of Network Message Volume (Network Amplification)", "lang": "en", "type": "CWE", "cweId": "CWE-406"}]}, {"descriptions": [{"description": "CWE-770 Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE", "cweId": "CWE-770"}]}], "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"cvssV4_0": {"version": "4.0", "baseScore": 6.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-05-18T22:28:44.941438Z", "id": "CVE-2026-45557", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "Technitium DNS Server excessive DNSSEC requests", "references": [{"name": "url", "url": "https://github.com/TechnitiumSoftware/DnsServer/blo/master/CHANGELOG.md#version-150", "tags": ["patch"]}, {"name": "url", "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-138-02.json"}, {"name": "url", "url": "https://www.cve.org/CVERecord?id=CVE-2026-45557"}], "credits": [{"value": "Shuhan Zhang, Tsinghua University", "lang": "en"}, {"value": "Dan Li, Tsinghua University", "lang": "en"}, {"value": "Baojun Liu, Tsinghua University", "lang": "en"}], "datePublic": "2026-05-19T00:00:00.000Z", "providerMetadata": {"orgId": "9119a7d8-5eab-497f-8521-727c672e3725", "shortName": "cisa-cg", "dateUpdated": "2026-05-19T13:47:47.291Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-19T14:53:37.637177Z", "id": "CVE-2026-45557", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-19T14:57:56.327Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-45557", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-19T14:53:37.637177Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-19T14:57:51.499Z"}}], "cna": {"title": "Technitium DNS Server excessive DNSSEC requests", "credits": [{"lang": "en", "value": "Shuhan Zhang, Tsinghua University"}, {"lang": "en", "value": "Dan Li, Tsinghua University"}, {"lang": "en", "value": "Baojun Liu, Tsinghua University"}], "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"cvssV4_0": {"version": "4.0", "baseScore": 6.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-45557", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-18T22:28:44.941438Z"}}}], "affected": [{"vendor": "Technitium", "product": "DNS Server", "versions": [{"status": "affected", "version": "0", "lessThan": "15.0", "versionType": "custom"}, {"status": "unaffected", "version": "15.0"}], "defaultStatus": "unknown"}], "datePublic": "2026-05-19T00:00:00.000Z", "references": [{"url": "https://github.com/TechnitiumSoftware/DnsServer/blo/master/CHANGELOG.md#version-150", "name": "url", "tags": ["patch"]}, {"url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-138-02.json", "name": "url"}, {"url": "https://www.cve.org/CVERecord?id=CVE-2026-45557", "name": "url"}], "descriptions": [{"lang": "en", "value": "Technitium DNS Server aggressively tries to fetch missing RRSIG records or mismatched DNSKEY records. An attacker in control of a domain can cause a vulnerable system to generate excessive network traffic. Fixed in 15.0."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-405", "description": "CWE-405 Asymmetric Resource Consumption (Amplification)"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-406", "description": "CWE-406 Insufficient Control of Network Message Volume (Network Amplification)"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "9119a7d8-5eab-497f-8521-727c672e3725", "shortName": "cisa-cg", "dateUpdated": "2026-05-19T13:47:47.291Z"}}}, "cveMetadata": {"cveId": "CVE-2026-45557", "state": "PUBLISHED", "dateUpdated": "2026-05-19T14:57:56.327Z", "dateReserved": "2026-05-12T18:08:43.759Z", "assignerOrgId": "9119a7d8-5eab-497f-8521-727c672e3725", "datePublished": "2026-05-19T13:47:47.291Z", "assignerShortName": "cisa-cg"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Technitium DNS Server aggressively tries to fetch missing RRSIG records or mismatched DNSKEY records. An attacker in control of a domain can cause a vulnerable system to generate excessive network traffic. Fixed in 15.0."}], "id": "CVE-2026-45557", "lastModified": "2026-05-19T17:57:25.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "9119a7d8-5eab-497f-8521-727c672e3725", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "9119a7d8-5eab-497f-8521-727c672e3725", "type": "Secondary"}]}, "published": "2026-05-19T15:16:31.640", "references": [{"source": "9119a7d8-5eab-497f-8521-727c672e3725", "url": "https://github.com/TechnitiumSoftware/DnsServer/blo/master/CHANGELOG.md#version-150"}, {"source": "9119a7d8-5eab-497f-8521-727c672e3725", "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-138-02.json"}, {"source": "9119a7d8-5eab-497f-8521-727c672e3725", "url": "https://www.cve.org/CVERecord?id=CVE-2026-45557"}], "sourceIdentifier": "9119a7d8-5eab-497f-8521-727c672e3725", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-405"}, {"lang": "en", "value": "CWE-406"}, {"lang": "en", "value": "CWE-770"}], "source": "9119a7d8-5eab-497f-8521-727c672e3725", "type": "Secondary"}]}

{}