{ "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": "Citrix heeft kwetsbaarheden verholpen in NetScaler ADC en NetScaler Gateway.", "title": "Feiten" }, { "category": "description", "text": "De kwetsbaarheid met kenmerk CVE-2026-19489 betreft een memory overflow in NetScaler ADC en NetScaler Gateway, wanneer de producten zijn geconfigureerd als SIP ALG binnen een Large Scale NAT (LSN) groep. Deze fout in de geheugenallocatie kan leiden tot onvoorspelbaar gedrag of een denial of service, waardoor de normale werking van het systeem verstoord kan worden.\n\nDe kwetsbaarheid met kenmerk CVE-2026-19490 maakt het voor een aanvaller mogelijk om via een alternatieve route de normale authenticatiemechanismen te omzeilen, om zodoende ongeautoriseerde toegang tot het systeem te verkrijgen. Om kwetsbaar te zijn moeten de producten in combinatie met specifieke versies geconfigureerd zijn als Gateway (VPN-virtuele server, ICA Proxy, CVPN, RDP Proxy), AAA virtual server of configureerd zijn als SAML Identity Provider. Dit laatste is geen gebruikelijke configuratie.", "title": "Interpretaties" }, { "category": "description", "text": "Citrix heeft updates uitgebracht om deze kwetsbaarheden in NetScaler ADC en NetScaler Gateway te verhelpen. Zie bijgevoegde referenties voor meer informatie.", "title": "Oplossingen" }, { "category": "general", "text": "medium", "title": "Kans" }, { "category": "general", "text": "medium", "title": "Schade" }, { "category": "general", "text": "Improper Restriction of Operations within the Bounds of a Memory Buffer", "title": "CWE-119" }, { "category": "general", "text": "Authentication Bypass Using an Alternate Path or Channel", "title": "CWE-288" } ], "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://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939" } ], "title": "Kwetsbaarheden verholpen in Citrix NetScaler ADC en NetScaler Gateway", "tracking": { "current_release_date": "2026-08-20T06:56:47.875131Z", "generator": { "date": "2025-08-04T16:30:00Z", "engine": { "name": "V.A.", "version": "1.3" } }, "id": "NCSC-2026-0318", "initial_release_date": "2026-08-20T06:56:47.875131Z", "revision_history": [ { "date": "2026-08-20T06:56:47.875131Z", "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": "NetScaler ADC and NetScaler Gateway" } ], "category": "vendor", "name": "Citrix" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-2" } } ], "category": "product_name", "name": "ADC" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-3" } } ], "category": "product_name", "name": "Gateway" } ], "category": "vendor", "name": "NetScaler" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-19489", "notes": [ { "category": "description", "text": "A memory overflow vulnerability in NetScaler ADC and NetScaler Gateway versions 13.1 through 63.21 and 14.1 through 73.32 can cause unpredictable behavior or Denial of Service.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:L", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3" ] }, "references": [ { "category": "self", "summary": "CVE-2026-19489 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-19489.json" } ], "title": "CVE-2026-19489" }, { "cve": "CVE-2026-19490", "cwe": { "id": "CWE-288", "name": "Authentication Bypass Using an Alternate Path or Channel" }, "notes": [ { "category": "other", "text": "Authentication Bypass Using an Alternate Path or Channel", "title": "CWE-288" }, { "category": "description", "text": "An authentication bypass vulnerability exists in NetScaler ADC and NetScaler Gateway versions 13.1 through 73.32 due to the use of an alternate path, potentially leading to security issues.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3" ] }, "references": [ { "category": "self", "summary": "CVE-2026-19490 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-19490.json" } ], "title": "CVE-2026-19490" } ] }