https://vulnerability.circl.lu Contains only the most 10 recent sightings. http://www.rssboard.org/rss-specification python-feedgen en Mon, 28 Sep 2026 23:14:21 +0000 https://vulnerability.circl.lu/sighting/38bdc425-251d-45bf-90d1-3b070472409b/export {"uuid": "38bdc425-251d-45bf-90d1-3b070472409b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://bsky.app/profile/r-blueteamsec.bsky.social/post/3mwl7byjmgm2r", "content": "Citrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778", "creation_timestamp": "2026-09-28T11:24:42.033020Z"} {"uuid": "38bdc425-251d-45bf-90d1-3b070472409b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://bsky.app/profile/r-blueteamsec.bsky.social/post/3mwl7byjmgm2r", "content": "Citrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778", "creation_timestamp": "2026-09-28T11:24:42.033020Z"} https://vulnerability.circl.lu/sighting/38bdc425-251d-45bf-90d1-3b070472409b/export Mon, 28 Sep 2026 11:24:42 +0000 https://vulnerability.circl.lu/sighting/66865788-739b-4c54-bbba-f72f727d825c/export {"uuid": "66865788-739b-4c54-bbba-f72f727d825c", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://bsky.app/profile/o2cloud.bsky.social/post/3mwkweluzbu2d", "content": "\ud83d\udd17 CVE : CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, CVE-2026-88778", "creation_timestamp": "2026-09-28T08:45:05.921307Z"} {"uuid": "66865788-739b-4c54-bbba-f72f727d825c", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://bsky.app/profile/o2cloud.bsky.social/post/3mwkweluzbu2d", "content": "\ud83d\udd17 CVE : CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, CVE-2026-88778", "creation_timestamp": "2026-09-28T08:45:05.921307Z"} https://vulnerability.circl.lu/sighting/66865788-739b-4c54-bbba-f72f727d825c/export Mon, 28 Sep 2026 08:45:05 +0000 https://vulnerability.circl.lu/sighting/d4b8d3af-fe1a-480d-ba36-86df92268f6b/export {"uuid": "d4b8d3af-fe1a-480d-ba36-86df92268f6b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://cyber.gc.ca/en/alerts-advisories/citrix-security-advisory-av26-965", "content": "", "creation_timestamp": "2026-09-28T05:16:20.000000Z"} {"uuid": "d4b8d3af-fe1a-480d-ba36-86df92268f6b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://cyber.gc.ca/en/alerts-advisories/citrix-security-advisory-av26-965", "content": "", "creation_timestamp": "2026-09-28T05:16:20.000000Z"} https://vulnerability.circl.lu/sighting/d4b8d3af-fe1a-480d-ba36-86df92268f6b/export Mon, 28 Sep 2026 05:16:20 +0000 https://vulnerability.circl.lu/sighting/26613100-51d8-47c9-a412-dfb02b97b873/export {"uuid": "26613100-51d8-47c9-a412-dfb02b97b873", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://www.ncsc.gov.uk/news/exploitation-of-vulnerabilities-affecting-citrix-netscaler-adc-and-citrix-netscaler-gateway", "content": "", "creation_timestamp": "2026-09-28T05:00:00.000000Z"} {"uuid": "26613100-51d8-47c9-a412-dfb02b97b873", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://www.ncsc.gov.uk/news/exploitation-of-vulnerabilities-affecting-citrix-netscaler-adc-and-citrix-netscaler-gateway", "content": "", "creation_timestamp": "2026-09-28T05:00:00.000000Z"} https://vulnerability.circl.lu/sighting/26613100-51d8-47c9-a412-dfb02b97b873/export Mon, 28 Sep 2026 05:00:00 +0000 https://vulnerability.circl.lu/sighting/6a26c1f6-f318-4e5e-ae11-06ce8520bb3d/export {"uuid": "6a26c1f6-f318-4e5e-ae11-06ce8520bb3d", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://www.cert.si/si-cert-2026-06-kriticne-ranljivosti-v-citrix-netscaler-adc-in-gateway", "content": "", "creation_timestamp": "2026-09-28T00:56:58.000000Z"} {"uuid": "6a26c1f6-f318-4e5e-ae11-06ce8520bb3d", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://www.cert.si/si-cert-2026-06-kriticne-ranljivosti-v-citrix-netscaler-adc-in-gateway", "content": "", "creation_timestamp": "2026-09-28T00:56:58.000000Z"} https://vulnerability.circl.lu/sighting/6a26c1f6-f318-4e5e-ae11-06ce8520bb3d/export Mon, 28 Sep 2026 00:56:58 +0000 https://vulnerability.circl.lu/sighting/3cfd9810-f1f8-41f2-9481-135f7d792ee4/export {"uuid": "3cfd9810-f1f8-41f2-9481-135f7d792ee4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://bsky.app/profile/cvemon.bsky.social/post/3mwk3weefug2f", "content": "CVE-2026-88774 is trending. Hype score 14, currently #7 on cvemon.\n\nVulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS\u2026\n\nhttps://cvemon.intruder.io/cves/CVE-2026-88774", "creation_timestamp": "2026-09-28T00:52:20.914845Z"} {"uuid": "3cfd9810-f1f8-41f2-9481-135f7d792ee4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://bsky.app/profile/cvemon.bsky.social/post/3mwk3weefug2f", "content": "CVE-2026-88774 is trending. Hype score 14, currently #7 on cvemon.\n\nVulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS\u2026\n\nhttps://cvemon.intruder.io/cves/CVE-2026-88774", "creation_timestamp": "2026-09-28T00:52:20.914845Z"} https://vulnerability.circl.lu/sighting/3cfd9810-f1f8-41f2-9481-135f7d792ee4/export Mon, 28 Sep 2026 00:52:20 +0000 https://vulnerability.circl.lu/sighting/093aaba4-9334-4ecb-943b-b92be4d25eb0/export {"uuid": "093aaba4-9334-4ecb-943b-b92be4d25eb0", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "exploited", "source": "https://t.me/VulnerabilityNews/44636", "content": "Critical Zero-Day Vulnerabilities Exploited in Citrix NetScaler ADC, Gateway\n\nCISA is amplifying Citrix\u2019s disclosure of eight new vulnerabilities affecting Citrix NetScaler ADC and Citrix NetScaler Gateway products: CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778.\u00a0\nCISA has added CVE-2026-88771 and CVE-2026-88772 to its Known Exploited Vulnerabilities (KEV) Catalog. Both are critical, zero-day vulnerabilities that can independently enable remote code execution. CISA has received reports and partner threat intelligence confirming that threat actors are actively exploiting these vulnerabilities globally.\nBecause updating Citrix NetScaler appliances can be complex and may require downtime, CISA is issuing this Alert to help organizations assess exposure, prioritize mitigation, and account for these vulnerabilities into their risk-management activities.\u00a0\nGiven the potential consequences of successful exploitation and the fact that malicious actors are exploiting at least some of these vulnerabilities, CISA urges users and administrators to review Citrix\u2019s advisories. If possible, users are encouraged to check for indication of compromise prior to patching. Citrix has made indicators of compromise available through NetScaler Console and published additional guidance in their recent publication, Security Bulletin for CVE-2026-88771 through CVE-2026-88778, to support organizations in assessing potential compromise. Should your organization suspect compromise, it is important to preserve forensic evidence prior to applying updates, as updates may result in loss of forensic visibility.\u00a0\nCitrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771 through CVE-2026-88778 - Security Updates - Citrix Community\nCitrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778\nSteps to Take if NetScaler ADC is Suspected to be Compromised\nDisclaimer\nThe information in this report is being provided \u201cas is\u201d for informational purposes only. CISA does not endorse any commercial entity, product, company, or service, including any entities, products, or services linked within this document. Any reference to specific commercial entities, products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply endorsement, recommendation, or favoring by CISA.\nhttps://www.cisa.gov/news-events/alerts/2026/09/27/critical-zero-day-vulnerabilities-exploited-citrix-netscaler-adc-gateway", "creation_timestamp": "2026-09-27T23:00:40.000000Z"} {"uuid": "093aaba4-9334-4ecb-943b-b92be4d25eb0", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "exploited", "source": "https://t.me/VulnerabilityNews/44636", "content": "Critical Zero-Day Vulnerabilities Exploited in Citrix NetScaler ADC, Gateway\n\nCISA is amplifying Citrix\u2019s disclosure of eight new vulnerabilities affecting Citrix NetScaler ADC and Citrix NetScaler Gateway products: CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778.\u00a0\nCISA has added CVE-2026-88771 and CVE-2026-88772 to its Known Exploited Vulnerabilities (KEV) Catalog. Both are critical, zero-day vulnerabilities that can independently enable remote code execution. CISA has received reports and partner threat intelligence confirming that threat actors are actively exploiting these vulnerabilities globally.\nBecause updating Citrix NetScaler appliances can be complex and may require downtime, CISA is issuing this Alert to help organizations assess exposure, prioritize mitigation, and account for these vulnerabilities into their risk-management activities.\u00a0\nGiven the potential consequences of successful exploitation and the fact that malicious actors are exploiting at least some of these vulnerabilities, CISA urges users and administrators to review Citrix\u2019s advisories. If possible, users are encouraged to check for indication of compromise prior to patching. Citrix has made indicators of compromise available through NetScaler Console and published additional guidance in their recent publication, Security Bulletin for CVE-2026-88771 through CVE-2026-88778, to support organizations in assessing potential compromise. Should your organization suspect compromise, it is important to preserve forensic evidence prior to applying updates, as updates may result in loss of forensic visibility.\u00a0\nCitrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771 through CVE-2026-88778 - Security Updates - Citrix Community\nCitrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778\nSteps to Take if NetScaler ADC is Suspected to be Compromised\nDisclaimer\nThe information in this report is being provided \u201cas is\u201d for informational purposes only. CISA does not endorse any commercial entity, product, company, or service, including any entities, products, or services linked within this document. Any reference to specific commercial entities, products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply endorsement, recommendation, or favoring by CISA.\nhttps://www.cisa.gov/news-events/alerts/2026/09/27/critical-zero-day-vulnerabilities-exploited-citrix-netscaler-adc-gateway", "creation_timestamp": "2026-09-27T23:00:40.000000Z"} https://vulnerability.circl.lu/sighting/093aaba4-9334-4ecb-943b-b92be4d25eb0/export Sun, 27 Sep 2026 23:00:40 +0000 https://vulnerability.circl.lu/sighting/a839fc7e-08e6-45a4-8cc6-d9bc466dc637/export {"uuid": "a839fc7e-08e6-45a4-8cc6-d9bc466dc637", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://www.hkcert.org/security-bulletin/citrix-products-multiple-vulnerabilities_20260928", "content": "", "creation_timestamp": "2026-09-27T18:00:00.000000Z"} {"uuid": "a839fc7e-08e6-45a4-8cc6-d9bc466dc637", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://www.hkcert.org/security-bulletin/citrix-products-multiple-vulnerabilities_20260928", "content": "", "creation_timestamp": "2026-09-27T18:00:00.000000Z"} https://vulnerability.circl.lu/sighting/a839fc7e-08e6-45a4-8cc6-d9bc466dc637/export Sun, 27 Sep 2026 18:00:00 +0000 https://vulnerability.circl.lu/sighting/2c8613fc-549f-48f2-97a1-b1dab1f14b09/export {"uuid": "2c8613fc-549f-48f2-97a1-b1dab1f14b09", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://infosec.exchange/users/DarkWebInformer/statuses/117344168526853624", "content": "\u203c\ufe0f Citrix has released a security bulletin regarding zero-day attacks targeting Citrix NetScaler ADC and Citrix NetScaler Gateway.\nMore info: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096\nCVEs: CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778", "creation_timestamp": "2026-09-27T17:25:16.219130Z"} {"uuid": "2c8613fc-549f-48f2-97a1-b1dab1f14b09", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://infosec.exchange/users/DarkWebInformer/statuses/117344168526853624", "content": "\u203c\ufe0f Citrix has released a security bulletin regarding zero-day attacks targeting Citrix NetScaler ADC and Citrix NetScaler Gateway.\nMore info: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096\nCVEs: CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778", "creation_timestamp": "2026-09-27T17:25:16.219130Z"} https://vulnerability.circl.lu/sighting/2c8613fc-549f-48f2-97a1-b1dab1f14b09/export Sun, 27 Sep 2026 17:25:16 +0000 https://vulnerability.circl.lu/sighting/be2aa831-4f0c-49df-b2cd-35ac80be71b4/export {"uuid": "be2aa831-4f0c-49df-b2cd-35ac80be71b4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://www.cert.at/de/warnungen/2026/9/kritische-sicherheitslucken-in-citrix-netscaler-adc-und-netscaler-gateway-aktiv-ausgenutzt-updates-verfugbar", "content": "27. September 2026\n\nBeschreibung\n\nIn Citrix NetScaler ADC und Citrix NetScaler Gateway existieren mehrere Sicherheitslücken, darunter zwei kritische Schwachstellen, die die Ausführung von beliebigem Code ermöglichen. Laut Hersteller werden CVE-2026-88771 und CVE-2026-88772 bereits aktiv ausgenutzt.\n\nCVE-Nummer(n): CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, CVE-2026-88778\n\nCVSS v4.0 Base Scores: bis zu 9.5 (kritisch)\n\nAuswirkungen\n\nCVE-2026-88771 ermöglicht es nicht authentifizierten Angreifer:innen aus der Ferne, aufgrund unzureichender Eingabevalidierung beliebige Befehle auszuführen. Laut Hersteller sind alle Installationen von NetScaler ADC und NetScaler Gateway betroffen, auch in der Standardkonfiguration.\n\nCVE-2026-88772 ist ein Speicherüberlauf, der zur Ausführung von beliebigem Code oder zu Denial-of-Service führen kann. Voraussetzung ist eine aktivierte DTLS-Konfiguration; auf VPN-Virtual-Servern ist DTLS standardmäßig aktiviert.\n\nDie weiteren Schwachstellen ermöglichen HTTP Request Smuggling (CVE-2026-88773), die Umgehung von Richtlinien mit HTTP-URL-basierten Ausdrücken (CVE-2026-88774), Denial-of-Service oder fehlerhaftes Verhalten durch Speicherüberläufe (CVE-2026-88775, CVE-2026-88776, CVE-2026-88777) sowie die Vorhersage von TCP Initial Sequence Numbers (CVE-2026-88778). Sie setzen jeweils bestimmte Konfigurationen voraus, u. a. den Betrieb als Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) oder AAA-Virtual-Server, Load-Balancing-Virtual-Server vom Typ Oracle oder aktivierte Nicht-HTTP-Layer-7-Protokollfunktionen (z. B. FTP, RTSP, DNS64, NAT64). Die genauen Voraussetzungen sowie Anleitungen zur Überprüfung der eigenen Konfiguration finden sich im Advisory des Herstellers.\n\nBetroffene Systeme\n\n\n\nCitrix NetScaler ADC und Citrix NetScaler Gateway 14.1 vor 14.1-73.37\n\nCitrix NetScaler ADC und Citrix NetScaler Gateway 13.1 vor 13.1-64.23\n\nCitrix NetScaler ADC 14.1-FIPS vor 14.1-73.37 FIPS\n\nCitrix NetScaler ADC 13.1-FIPS und 13.1-NDcPP vor 13.1-37.279\n\n\nEbenfalls betroffen sind Secure-Private-Access-Hybrid-Installationen, die NetScaler-Instanzen verwenden. Das Advisory gilt nur für kundenseitig verwaltete Installationen; von Citrix verwaltete Cloud-Dienste sowie Adaptive Authentication werden vom Hersteller aktualisiert.\n\nAbhilfe\n\nCitrix stellt Updates bereit, welche die Schwachstellen beheben: Version 14.1-73.37 bzw. 13.1-64.23 für NetScaler ADC und NetScaler Gateway sowie 14.1-73.37 FIPS bzw. 13.1-37.279 für die FIPS- und NDcPP-Varianten. Aufgrund der aktiven Ausnutzung wird dringend empfohlen, die Updates umgehend einzuspielen. Dies gilt auch für NetScaler-Instanzen in Secure-Private-Access-Hybrid-Installationen.\n\nFür von CVE-2026-88778 betroffene Systeme empfiehlt der Hersteller zusätzlich, die Option „Enhanced ISN Generation“ zu aktivieren (set ns tcpparam -enhancedISNgeneration ENABLED). Details finden sich in der Dokumentation des Herstellers.\n\nAufgrund der aktiven Ausnutzung empfiehlt CERT.at zudem, betroffene Systeme auf Anzeichen einer Kompromittierung zu überprüfen.\n\nHinweis\n\nGenerell empfiehlt CERT.at, sämtliche Software aktuell zu halten und dabei insbesondere auf automatische Updates zu setzen. Regelmäßige Neustarts stellen sicher, dass diese auch zeitnah aktiviert werden.\n\n\n\nInformationsquelle(n):\n\nCitrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778 (Englisch)https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096\n\nTCP configurations – Enhanced ISN generation (Englisch)https://docs.netscaler.com/en-us/citrix-adc/current-release/system/tcp-configurations.html#enhanced-isn-generation", "creation_timestamp": "2026-09-27T15:56:07.000000Z"} {"uuid": "be2aa831-4f0c-49df-b2cd-35ac80be71b4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-88774", "type": "seen", "source": "https://www.cert.at/de/warnungen/2026/9/kritische-sicherheitslucken-in-citrix-netscaler-adc-und-netscaler-gateway-aktiv-ausgenutzt-updates-verfugbar", "content": "27. September 2026\n\nBeschreibung\n\nIn Citrix NetScaler ADC und Citrix NetScaler Gateway existieren mehrere Sicherheitslücken, darunter zwei kritische Schwachstellen, die die Ausführung von beliebigem Code ermöglichen. Laut Hersteller werden CVE-2026-88771 und CVE-2026-88772 bereits aktiv ausgenutzt.\n\nCVE-Nummer(n): CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, CVE-2026-88778\n\nCVSS v4.0 Base Scores: bis zu 9.5 (kritisch)\n\nAuswirkungen\n\nCVE-2026-88771 ermöglicht es nicht authentifizierten Angreifer:innen aus der Ferne, aufgrund unzureichender Eingabevalidierung beliebige Befehle auszuführen. Laut Hersteller sind alle Installationen von NetScaler ADC und NetScaler Gateway betroffen, auch in der Standardkonfiguration.\n\nCVE-2026-88772 ist ein Speicherüberlauf, der zur Ausführung von beliebigem Code oder zu Denial-of-Service führen kann. Voraussetzung ist eine aktivierte DTLS-Konfiguration; auf VPN-Virtual-Servern ist DTLS standardmäßig aktiviert.\n\nDie weiteren Schwachstellen ermöglichen HTTP Request Smuggling (CVE-2026-88773), die Umgehung von Richtlinien mit HTTP-URL-basierten Ausdrücken (CVE-2026-88774), Denial-of-Service oder fehlerhaftes Verhalten durch Speicherüberläufe (CVE-2026-88775, CVE-2026-88776, CVE-2026-88777) sowie die Vorhersage von TCP Initial Sequence Numbers (CVE-2026-88778). Sie setzen jeweils bestimmte Konfigurationen voraus, u. a. den Betrieb als Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) oder AAA-Virtual-Server, Load-Balancing-Virtual-Server vom Typ Oracle oder aktivierte Nicht-HTTP-Layer-7-Protokollfunktionen (z. B. FTP, RTSP, DNS64, NAT64). Die genauen Voraussetzungen sowie Anleitungen zur Überprüfung der eigenen Konfiguration finden sich im Advisory des Herstellers.\n\nBetroffene Systeme\n\n\n\nCitrix NetScaler ADC und Citrix NetScaler Gateway 14.1 vor 14.1-73.37\n\nCitrix NetScaler ADC und Citrix NetScaler Gateway 13.1 vor 13.1-64.23\n\nCitrix NetScaler ADC 14.1-FIPS vor 14.1-73.37 FIPS\n\nCitrix NetScaler ADC 13.1-FIPS und 13.1-NDcPP vor 13.1-37.279\n\n\nEbenfalls betroffen sind Secure-Private-Access-Hybrid-Installationen, die NetScaler-Instanzen verwenden. Das Advisory gilt nur für kundenseitig verwaltete Installationen; von Citrix verwaltete Cloud-Dienste sowie Adaptive Authentication werden vom Hersteller aktualisiert.\n\nAbhilfe\n\nCitrix stellt Updates bereit, welche die Schwachstellen beheben: Version 14.1-73.37 bzw. 13.1-64.23 für NetScaler ADC und NetScaler Gateway sowie 14.1-73.37 FIPS bzw. 13.1-37.279 für die FIPS- und NDcPP-Varianten. Aufgrund der aktiven Ausnutzung wird dringend empfohlen, die Updates umgehend einzuspielen. Dies gilt auch für NetScaler-Instanzen in Secure-Private-Access-Hybrid-Installationen.\n\nFür von CVE-2026-88778 betroffene Systeme empfiehlt der Hersteller zusätzlich, die Option „Enhanced ISN Generation“ zu aktivieren (set ns tcpparam -enhancedISNgeneration ENABLED). Details finden sich in der Dokumentation des Herstellers.\n\nAufgrund der aktiven Ausnutzung empfiehlt CERT.at zudem, betroffene Systeme auf Anzeichen einer Kompromittierung zu überprüfen.\n\nHinweis\n\nGenerell empfiehlt CERT.at, sämtliche Software aktuell zu halten und dabei insbesondere auf automatische Updates zu setzen. Regelmäßige Neustarts stellen sicher, dass diese auch zeitnah aktiviert werden.\n\n\n\nInformationsquelle(n):\n\nCitrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771, CVE-2026-88772, CVE-2026-88773, CVE-2026-88774, CVE-2026-88775, CVE-2026-88776, CVE-2026-88777, and CVE-2026-88778 (Englisch)https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096\n\nTCP configurations – Enhanced ISN generation (Englisch)https://docs.netscaler.com/en-us/citrix-adc/current-release/system/tcp-configurations.html#enhanced-isn-generation", "creation_timestamp": "2026-09-27T15:56:07.000000Z"} https://vulnerability.circl.lu/sighting/be2aa831-4f0c-49df-b2cd-35ac80be71b4/export Sun, 27 Sep 2026 15:56:07 +0000