Exploitation evidence
Known exploited · CISA KEV listed
Added 2025-06-30. 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: 2025-07-21. 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 < 47.46 (patch)
- affected: 13.1 to < 59.19 (patch)
- affected: 13.1 FIPS and NDcPP to < 37.236 (patch)
NetScaler / Gateway
Default status: unaffected
- affected: 14.1 to < 47.46 (patch)
- affected: 13.1 to < 59.19 (patch)
- affected: 13.1 FIPS and NDcPP to < 37.236 (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": 0.10433,
"percentile": 0.95803
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.10433,
"percentile": 0.95775
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.10433,
"percentile": 0.9577
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.10433,
"percentile": 0.9577
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.10433,
"percentile": 0.95767
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.10433,
"percentile": 0.95761
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.10433,
"percentile": 0.95756
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.10433,
"percentile": 0.95752
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.10433,
"percentile": 0.95744
}03 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-6543",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-07-17T03:55:32.992762Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2025-06-30",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543"
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"timeline": [
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"lang": "en",
"time": "2025-06-30T00:00:00.000Z",
"value": "CVE-2025-6543 added to CISA KEV"
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],
"title": "CISA ADP Vulnrichment"
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"affected": [
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"versions": [
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"lessThan": "37.236",
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"datePublic": "2025-06-25T12:30:00.000Z",
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"value": "Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server"
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],
"value": "Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server"
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],
"metrics": [
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"cvssV4_0": {
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 9.2,
"baseSeverity": "CRITICAL",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "LOW",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L",
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"problemTypes": [
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"description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer",
"lang": "en",
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"providerMetadata": {
"dateUpdated": "2025-06-25T12:49:57.896Z",
"orgId": "e437aed5-38e0-4fa3-a98b-cb73e7acaec6",
"shortName": "Citrix"
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"references": [
{
"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Memory overflow vulnerability leading to unintended control flow and Denial of Service",
"x_generator": {
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"cveMetadata": {
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"assignerShortName": "Citrix",
"cveId": "CVE-2025-6543",
"datePublished": "2025-06-25T12:49:57.896Z",
"dateReserved": "2025-06-23T18:08:23.912Z",
"dateUpdated": "2026-02-26T17:50:24.557Z",
"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": 0.10433,
"percentile": 0.95739
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2025-6543",
"cwes": [
"CWE-119"
],
"dateAdded": "2025-06-30",
"dueDate": "2025-07-21",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788 ; https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/ ; https://nvd.nist.gov/vuln/detail/CVE-2025-6543",
"product": "NetScaler ADC and Gateway",
"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 and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.",
"vendorProject": "Citrix",
"vulnerabilityName": "Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability"
}