FKIE_CVE-2025-6543

Vulnerability from fkie_nvd - Published: 2025-06-25 13:15 - Updated: 2025-10-24 13:42
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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
References
secure@citrix.comhttps://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543US Government Resource
Impacted products
Vendor Product Version
citrix netscaler_application_delivery_controller *
citrix netscaler_application_delivery_controller *
citrix netscaler_application_delivery_controller *
citrix netscaler_application_delivery_controller *
citrix netscaler_gateway *
citrix netscaler_gateway *
To clipboard 

{
  "cisaActionDue": "2025-07-21",
  "cisaExploitAdd": "2025-06-30",
  "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
  "cisaVulnerabilityName": "Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*",
              "matchCriteriaId": "0F079648-790A-4D18-908D-25CA575C5B46",
              "versionEndExcluding": "13.1-37.236",
              "versionStartIncluding": "13.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*",
              "matchCriteriaId": "CF89AD2E-8A0A-43A9-9EEB-83D595576775",
              "versionEndExcluding": "13.1-37.236",
              "versionStartIncluding": "13.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*",
              "matchCriteriaId": "355DCB05-54E3-4C13-A74A-B27CE3F10597",
              "versionEndExcluding": "13.1-59.19",
              "versionStartIncluding": "13.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*",
              "matchCriteriaId": "4A26624D-7F3F-4FD7-AC50-C9BDCA656F7B",
              "versionEndExcluding": "14.1-47.46",
              "versionStartIncluding": "14.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "598029C6-734C-450C-A7EC-495C72819E88",
              "versionEndExcluding": "13.1-59.19",
              "versionStartIncluding": "13.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D977C8AE-4B4E-474D-ABD6-F55F054E5B59",
              "versionEndExcluding": "14.1-47.46",
              "versionStartIncluding": "14.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when\u00a0configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server"
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de desbordamiento de memoria que provoca un flujo de control no deseado y una denegaci\u00f3n de servicio en NetScaler ADC y NetScaler Gateway cuando se configuran como Gateway (servidor virtual VPN, proxy ICA, CVPN, proxy RDP) O servidor virtual AAA"
    }
  ],
  "id": "CVE-2025-6543",
  "lastModified": "2025-10-24T13:42:21.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.2,
          "baseSeverity": "CRITICAL",
          "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:H/AT:P/PR:N/UI:N/VC:H/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": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "secure@citrix.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-06-25T13:15:27.293",
  "references": [
    {
      "source": "secure@citrix.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543"
    }
  ],
  "sourceIdentifier": "secure@citrix.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ],
      "source": "secure@citrix.com",
      "type": "Secondary"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.