Exploitation evidence
Known exploited · CISA KEV listed
Added 2026-03-30. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: 2026-04-02. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
NetScaler / ADC
Default status: unaffected
- affected: 14.1 to < 66.59 (patch)
- affected: 13.1 to < 62.23 (patch)
- affected: 13.1 FIPS and NDcPP to < 37.262 (patch)
NetScaler / Gateway
Default status: unaffected
- affected: 14.1 to < 66.59 (patch)
- affected: 13.1 to < 62.23 (patch)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.91491,
"percentile": 0.99816
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.91491,
"percentile": 0.99815
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.91491,
"percentile": 0.99814
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.91491,
"percentile": 0.99814
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.91491,
"percentile": 0.99814
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.91491,
"percentile": 0.99814
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.91491,
"percentile": 0.99814
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.91491,
"percentile": 0.99813
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.91491,
"percentile": 0.99813
}03 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-3055",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-23T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2026-03-30",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055"
},
"type": "kev"
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}
],
"providerMetadata": {
"dateUpdated": "2026-03-31T03:55:32.569Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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],
"url": "https://labs.watchtowr.com/please-we-beg-just-one-weekend-free-of-appliances-citrix-netscaler-cve-2026-3055-memory-overread-part-2/"
},
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-03-30T00:00:00.000Z",
"value": "CVE-2026-3055 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
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],
"cna": {
"affected": [
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"defaultStatus": "unaffected",
"product": "ADC",
"vendor": "NetScaler",
"versions": [
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"lessThan": "66.59",
"status": "affected",
"version": "14.1",
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{
"lessThan": "62.23",
"status": "affected",
"version": "13.1",
"versionType": "patch"
},
{
"lessThan": "37.262",
"status": "affected",
"version": "13.1 FIPS and NDcPP",
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},
{
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"datePublic": "2026-03-23T19:20:00.000Z",
"descriptions": [
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"type": "text/html",
"value": "Insufficient input validation in <span style=\"background-color: rgb(255, 255, 255);\">NetScaler ADC and NetScaler Gateway when<span style=\"background-color: rgb(255, 255, 255);\"> configured as a SAML IDP </span>leading to<span style=\"background-color: rgb(255, 255, 255);\"> memory overread</span></span><br>"
}
],
"value": "Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread"
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],
"metrics": [
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"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"exploitMaturity": "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:H/VI:H/VA:H/SC:L/SI:L/SA:L",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-23T20:21:27.107Z",
"orgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
"shortName": "NetScaler"
},
"references": [
{
"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Insufficient input validation leading to memory overread",
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
"assignerShortName": "NetScaler",
"cveId": "CVE-2026-3055",
"datePublished": "2026-03-23T20:21:27.107Z",
"dateReserved": "2026-02-23T18:00:08.900Z",
"dateUpdated": "2026-03-31T03:55:32.569Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.91491,
"percentile": 0.99812
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2026-3055",
"cwes": [
"CWE-125"
],
"dateAdded": "2026-03-30",
"dueDate": "2026-04-02",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300&articleURL=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_3055_and_CVE_2026_4368 ; https://nvd.nist.gov/vuln/detail/CVE-2026-3055",
"product": "NetScaler",
"requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread.",
"vendorProject": "Citrix",
"vulnerabilityName": "Citrix NetScaler Out-of-Bounds Read Vulnerability"
}