{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-88778", "assignerOrgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "state": "PUBLISHED", "assignerShortName": "NetScaler", "dateReserved": "2026-09-10T07:14:57.370Z", "datePublished": "2026-09-27T16:43:16.503Z", "dateUpdated": "2026-09-27T16:43:16.503Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "shortName": "NetScaler", "dateUpdated": "2026-09-27T16:43:16.503Z"}, "title": "TCP Initial Sequence Number (ISN) prediction", "datePublic": "2026-09-27T15:30:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-342", "description": "CWE-342 Predictable exact value from previous values", "type": "CWE"}]}], "affected": [{"vendor": "Citrix NetScaler", "product": "ADC", "versions": [{"status": "affected", "version": "0", "lessThan": "14.1-73.37", "versionType": "Patch"}, {"status": "affected", "version": "0", "lessThan": "13.1-64.23", "versionType": "Patch"}, {"status": "affected", "version": "0", "lessThan": "14.1-73.37 FIPS", "versionType": "Patch"}, {"status": "affected", "version": "0", "lessThan": "13.1.37.279 FIPS and NDcPP", "versionType": "Patch"}], "defaultStatus": "unaffected"}, {"vendor": "Citrix NetScaler", "product": "Gateway", "versions": [{"status": "affected", "version": "0", "lessThan": "14.1-73.37", "versionType": "Patch"}, {"status": "affected", "version": "0", "lessThan": "13.1-64.23", "versionType": "Patch"}], "defaultStatus": "unaffected"}], "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Predictable exact value from previous values vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.<p>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 and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23.</p>"}]}], "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"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "ADC", "vendor": "Citrix NetScaler", "versions": [{"lessThan": "14.1-73.37", "status": "affected", "version": "0", "versionType": "Patch"}, {"lessThan": "13.1-64.23", "status": "affected", "version": "0", "versionType": "Patch"}, {"lessThan": "14.1-73.37 FIPS", "status": "affected", "version": "0", "versionType": "Patch"}, {"lessThan": "13.1.37.279 FIPS and NDcPP", "status": "affected", "version": "0", "versionType": "Patch"}]}, {"defaultStatus": "unaffected", "product": "Gateway", "vendor": "Citrix NetScaler", "versions": [{"lessThan": "14.1-73.37", "status": "affected", "version": "0", "versionType": "Patch"}, {"lessThan": "13.1-64.23", "status": "affected", "version": "0", "versionType": "Patch"}]}], "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*", "matchCriteriaId": "6BC2D462-9ABE-4024-8E46-8D265C0B19FB", "versionEndExcluding": "13.1-64.23", "versionStartIncluding": "13.1", "vulnerable": true}, {"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*", "matchCriteriaId": "2DB314FE-3886-4ABD-A820-B8A70EBB23A6", "versionEndExcluding": "13.1.37.279", "versionStartIncluding": "13.1", "vulnerable": true}, {"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*", "matchCriteriaId": "FCFFA1B3-87CE-4CC8-990E-D3CE0B55CD45", "versionEndExcluding": "13.1.37.279", "versionStartIncluding": "13.1", "vulnerable": true}, {"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*", "matchCriteriaId": "1CA9588A-E3EB-44FC-9515-6EB89BB8C1D6", "versionEndExcluding": "14.1-73.37", "versionStartIncluding": "14.1", "vulnerable": true}, {"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*", "matchCriteriaId": "046FF602-D956-4961-89BF-2041A3590004", "versionEndIncluding": "14.1-73.37", "versionStartIncluding": "14.1-66.68", "vulnerable": true}, {"criteria": "cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*", "matchCriteriaId": "3286D2C3-EA7E-4D9C-95DE-05D462DC8B1B", "versionEndExcluding": "13.1-64.23", "versionStartIncluding": "13.1", "vulnerable": true}, {"criteria": "cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*", "matchCriteriaId": "C77243A7-1FDB-4557-88BE-EDF3BAA56A81", "versionEndExcluding": "14.1-73.37", "versionStartIncluding": "14.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "Vulnerabilidad de valor exacto predecible a partir de valores anteriores en Citrix NetScaler ADC y Citrix NetScaler Gateway.\n\nEste problema afecta a ADC: versiones anteriores a 14.1-73.37, anteriores a 13.1-64.23, anteriores a 14.1-73.37 FIPS, y anteriores a 13.1.37.279 FIPS y NDcPP; Gateway: versiones anteriores a 14.1-73.37 y anteriores a 13.1-64.23."}], "id": "CVE-2026-88778", "lastModified": "2026-09-28T18:19:33.703", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "type": "Secondary"}]}, "published": "2026-09-27T17:16:57.110", "references": [{"source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "tags": ["Vendor Advisory"], "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096"}], "sourceIdentifier": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-342"}], "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "type": "Secondary"}]}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,14.1-73.37)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,13.1-64.23)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,14.1-73.37 FIPS)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,13.1.37.279 FIPS and NDcPP)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "ADC", "source": "cna", "vendor": "Citrix NetScaler"}, "product": "netscaler_adc", "vendor": "citrix"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,14.1-73.37)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,13.1-64.23)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Gateway", "source": "cna", "vendor": "Citrix NetScaler"}, "product": "netscaler_gateway", "vendor": "citrix"}], "created": "2026-09-27T18:00:12.518117+00:00", "updated": "2026-09-28T16:24:11.698800+00:00", "vendors": ["citrix", "citrix$PRODUCT$netscaler_adc", "citrix$PRODUCT$netscaler_gateway"]}