{"api_version":"1","generated_at":"2026-04-22T21:37:54+00:00","cve":"CVE-2021-25663","urls":{"html":"https://cve.report/CVE-2021-25663","api":"https://cve.report/api/cve/CVE-2021-25663.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-25663","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-25663"},"summary":{"title":"CVE-2021-25663","description":"A vulnerability has been identified in Capital VSTAR (Versions including affected IPv6 stack), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.","state":"PUBLIC","assigner":"productcert@siemens.com","published_at":"2021-04-22 21:15:00","updated_at":"2021-12-10 19:55:00"},"problem_types":["CWE-835"],"metrics":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf","name":"https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf","refsource":"MISC","tags":[],"title":"","mime":"application/pdf","httpstatus":"200","archivestatus":"404"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05","name":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05","refsource":"CONFIRM","tags":[],"title":"Siemens Nucleus Products IPv6 Stack | CISA","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-25663","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25663","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"25663","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"siemens","cpe5":"capital_vstar","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"25663","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"siemens","cpe5":"nucleus_4","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"25663","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"siemens","cpe5":"nucleus_net","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"25663","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"siemens","cpe5":"nucleus_readystart","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"25663","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"siemens","cpe5":"nucleus_source_code","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"25663","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"siemens","cpe5":"vstar","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"productcert@siemens.com","ID":"CVE-2021-25663","STATE":"PUBLIC"},"data_format":"MITRE","data_version":"4.0","data_type":"CVE","affects":{"vendor":{"vendor_data":[{"vendor_name":"Siemens","product":{"product_data":[{"product_name":"Capital VSTAR","version":{"version_data":[{"version_value":"Versions including affected IPv6 stack"}]}},{"product_name":"Nucleus NET","version":{"version_data":[{"version_value":"All versions"}]}},{"product_name":"Nucleus ReadyStart V3","version":{"version_data":[{"version_value":"All versions < V2017.02.4"}]}},{"product_name":"Nucleus ReadyStart V4","version":{"version_data":[{"version_value":"All versions < V4.1.0"}]}},{"product_name":"Nucleus Source Code","version":{"version_data":[{"version_value":"Versions including affected IPv6 stack"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')"}]}]},"description":{"description_data":[{"lang":"eng","value":"A vulnerability has been identified in Capital VSTAR (Versions including affected IPv6 stack), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values."}]},"references":{"reference_data":[{"refsource":"MISC","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf","name":"https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf"},{"refsource":"CONFIRM","name":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05","url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05"}]}},"nvd":{"publishedDate":"2021-04-22 21:15:00","lastModifiedDate":"2021-12-10 19:55:00","problem_types":["CWE-835"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":5},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:siemens:nucleus_source_code:-:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:siemens:capital_vstar:-:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:siemens:nucleus_readystart:*:*:*:*:*:*:*:*","versionEndExcluding":"4.1.0","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:siemens:nucleus_readystart:*:*:*:*:*:*:*:*","versionEndExcluding":"2017.02.4","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"25663","Ordinal":"200486","Title":"CVE-2021-25663","CVE":"CVE-2021-25663","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"25663","Ordinal":"1","NoteData":"A vulnerability has been identified in Capital VSTAR (Versions including affected IPv6 stack), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"25663","Ordinal":"2","NoteData":"2021-04-22","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"25663","Ordinal":"3","NoteData":"2021-11-09","Type":"Other","Title":"Modified"}]}}}