{ "document": { "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "nl", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." }, { "category": "description", "text": "Cisco heeft kwetsbaarheden verholpen in Cisco Nexus 9000 Series Switches met Silicon One technologie, Cisco IOS XR Software en Cisco Secure Email.", "title": "Feiten" }, { "category": "description", "text": "De ernstigste kwetsbaarheid betreft Nexus 9000-switches: als TCP 43210 of 43211 bereikbaar is, kan een aanvaller zonder authenticatie code met rootrechten uitvoeren en de switch laten herstarten. De IOS XR-kwetsbaarheden kunnen, afhankelijk van platform en configuratie, diverse beveiligingsfuncties ondermijnen. De Secure Email-kwetsbaarheden kunnen alleen bij een man-in-the-middlepositie en S/MIME-gebruik leiden tot het ontsleutelen van e-mail en het aanpassen van verkeer tussen e-mail gateways.", "title": "Interpretaties" }, { "category": "description", "text": "Cisco heeft updates uitgebracht voor Cisco Nexus 9000 Series Switches, IOS XR Software en Secure Email om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.", "title": "Oplossingen" }, { "category": "general", "text": "medium", "title": "Kans" }, { "category": "general", "text": "high", "title": "Schade" }, { "category": "general", "text": "Improper Validation of Integrity Check Value", "title": "CWE-354" }, { "category": "general", "text": "Binding to an Unrestricted IP Address", "title": "CWE-1327" } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "Nationaal Cyber Security Centrum", "namespace": "https://www.ncsc.nl/" }, "references": [ { "category": "external", "summary": "Reference", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-smime-disc-dzw4rEdY" }, { "category": "external", "summary": "Reference", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcM" }, { "category": "external", "summary": "Reference", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr" } ], "title": "Kwetsbaarheden verholpen in Cisco Nexus 9000 Series, IOS XR Software en Secure Email", "tracking": { "current_release_date": "2026-09-03T13:09:49.681702Z", "generator": { "date": "2025-08-04T16:30:00Z", "engine": { "name": "V.A.", "version": "1.3" } }, "id": "NCSC-2026-0338", "initial_release_date": "2026-09-03T13:09:49.681702Z", "revision_history": [ { "date": "2026-09-03T13:09:49.681702Z", "number": "1.0.0", "summary": "Initiele versie" } ], "status": "final", "version": "1.0.0" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-1" } } ], "category": "product_name", "name": "AsyncOS" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-2" } } ], "category": "product_name", "name": "Cisco IOS XR" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-3" } } ], "category": "product_name", "name": "Cisco IOS XR Software" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-4" } } ], "category": "product_name", "name": "Cisco NX-OS Software" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-5" } } ], "category": "product_name", "name": "Cisco Nexus 9000 Series Switches" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-6" } } ], "category": "product_name", "name": "Cisco Secure Email" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-7" } } ], "category": "product_name", "name": "Nexus" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-8" } } ], "category": "product_name", "name": "Secure Email Gateway" } ], "category": "vendor", "name": "Cisco" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-20212", "cwe": { "id": "CWE-1327", "name": "Binding to an Unrestricted IP Address" }, "notes": [ { "category": "other", "text": "Binding to an Unrestricted IP Address", "title": "CWE-1327" }, { "category": "description", "text": "A vulnerability in Cisco Nexus 9000 Series Switches' Silicon One integration allows unauthenticated remote attackers to execute root-level code via accessible TCP ports 43210 and 43211, potentially causing device crashes and reloads.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20212 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20212.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20212" }, { "cve": "CVE-2026-20274", "notes": [ { "category": "description", "text": "Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper resource control (CVE-2026-20274, CWE-664).", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20274 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20274.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20274" }, { "cve": "CVE-2026-20275", "notes": [ { "category": "description", "text": "Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities, including incorrect calculation issues classified under CWE-682 and tracked by CVE-2026-20275.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20275 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20275.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20275" }, { "cve": "CVE-2026-20276", "notes": [ { "category": "description", "text": "Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to insufficient control flow management (CVE-2026-20276, CWE-691).", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20276 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20276.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "baseScore": 8.6, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20276" }, { "cve": "CVE-2026-20277", "notes": [ { "category": "description", "text": "Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities related to protection mechanism failures, including those classified under CWE-693 and tracked by CVE-2026-20277.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20277 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20277.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 8.2, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20277" }, { "cve": "CVE-2026-20278", "notes": [ { "category": "description", "text": "Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to improper neutralization issues, including those classified under CWE-707 and tracked by CVE-2026-20278.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20278 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20278.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20278" }, { "cve": "CVE-2026-20279", "notes": [ { "category": "description", "text": "Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to improper access control (CVE-2026-20279, CWE-284).", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20279 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20279.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20279" }, { "cve": "CVE-2026-20280", "notes": [ { "category": "description", "text": "Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper handling of exceptional conditions (CVE-2026-20280, CWE-703).", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20280 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20280.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20280" }, { "cve": "CVE-2026-20354", "cwe": { "id": "CWE-354", "name": "Improper Validation of Integrity Check Value" }, "notes": [ { "category": "other", "text": "Improper Validation of Integrity Check Value", "title": "CWE-354" }, { "category": "description", "text": "Multiple vulnerabilities in Cisco Secure Email's S/MIME decryption allow unauthenticated remote attackers to recover plaintext from encrypted emails by exploiting insufficient message integrity validation via man-in-the-middle attacks.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20354 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20354.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.9, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20354" }, { "cve": "CVE-2026-20355", "cwe": { "id": "CWE-354", "name": "Improper Validation of Integrity Check Value" }, "notes": [ { "category": "other", "text": "Improper Validation of Integrity Check Value", "title": "CWE-354" }, { "category": "description", "text": "Multiple vulnerabilities in Cisco Secure Email's S/MIME decryption allow unauthenticated remote attackers to recover plaintext from encrypted emails by exploiting insufficient message integrity validation via man-in-the-middle attacks.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] }, "references": [ { "category": "self", "summary": "CVE-2026-20355 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20355.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.9, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8" ] } ], "title": "CVE-2026-20355" } ] }