{"id":"CVE-2026-88778","state":"PUBLISHED","title":"TCP Initial Sequence Number (ISN) prediction","description":"Predictable exact value from previous values vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.\n\nThis 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 and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23.","publishedAt":"2026-09-27T16:43:16.503Z","updatedAt":"2026-09-29T16:35:06.769Z","severity":{"score":8.8,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L","source":"NetScaler"},"assigner":"NetScaler","products":["Citrix NetScaler ADC","Citrix NetScaler Gateway"],"affected":[{"vendor":"Citrix NetScaler","product":"ADC","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"14.1-73.37","versionType":"Patch"},{"version":"0","status":"affected","lessThan":"13.1-64.23","versionType":"Patch"},{"version":"0","status":"affected","lessThan":"14.1-73.37 FIPS","versionType":"Patch"},{"version":"0","status":"affected","lessThan":"13.1.37.279 FIPS and NDcPP","versionType":"Patch"}]},{"vendor":"Citrix NetScaler","product":"Gateway","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"14.1-73.37","versionType":"Patch"},{"version":"0","status":"affected","lessThan":"13.1-64.23","versionType":"Patch"}]}],"references":["https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096"],"weaknesses":["CWE-342"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/88xxx/CVE-2026-88778.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-88778","state":"PUBLISHED","datePublished":"2026-09-27T16:43:16.503Z","dateUpdated":"2026-09-29T16:35:06.769Z","assignerShortName":"NetScaler","assignerOrgId":"50a63c94-1ea7-4568-8c11-eb79e7c5a2b5","dateReserved":"2026-09-10T07:14:57.370Z"},"containers":{"cna":{"title":"TCP Initial Sequence Number (ISN) prediction","descriptions":[{"lang":"en","value":"Predictable exact value from previous values vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.\n\nThis 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 and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23."}],"affected":[{"vendor":"Citrix NetScaler","product":"ADC","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"14.1-73.37","versionType":"Patch"},{"version":"0","status":"affected","lessThan":"13.1-64.23","versionType":"Patch"},{"version":"0","status":"affected","lessThan":"14.1-73.37 FIPS","versionType":"Patch"},{"version":"0","status":"affected","lessThan":"13.1.37.279 FIPS and NDcPP","versionType":"Patch"}]},{"vendor":"Citrix NetScaler","product":"Gateway","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"14.1-73.37","versionType":"Patch"},{"version":"0","status":"affected","lessThan":"13.1-64.23","versionType":"Patch"}]}],"references":[{"url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"LOW","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"LOW","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.8,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-342","lang":"en","description":"CWE-342 Predictable exact value from previous values","type":"CWE"}]}],"providerMetadata":{"shortName":"NetScaler","orgId":"50a63c94-1ea7-4568-8c11-eb79e7c5a2b5","dateUpdated":"2026-09-27T16:43:16.503Z"},"datePublic":"2026-09-27T15:30:00.000Z","source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-29T16:34:20.349812Z","id":"CVE-2026-88778","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-29T16:35:06.769Z"}}]}}}