cvelistv5 - CVE-2025-6543

CVE-2025-6543 (GCVE-0-2025-6543)

Vulnerability from cvelistv5

Published

2025-06-25 12:49

Modified

2025-06-30 22:20

Severity ?

9.2 (Critical) - 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

CWE

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

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

▼	URL	Tags
	secure@citrix.com	https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788	Vendor Advisory

Impacted products

Vendor

Product

Version

▼

NetScaler

ADC

Version: 14.1
Version: 13.1
Version: 13.1 FIPS and NDcPP

NetScaler

Gateway

Version: 14.1
Version: 13.1
Version: 13.1 FIPS and NDcPP

CISA Known exploited vulnerability

Data from the Known Exploited Vulnerabilities Catalog

Date added: 2025-06-30

Due date: 2025-07-21

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.

Used in ransomware: 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

Show details on NVD website

JSON

To clipboard

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fkie_cve-2025-6543

Vulnerability from fkie_nvd

Published

2025-06-25 13:15

Modified

2025-07-01 18:19

Severity ?

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

▼	URL	Tags
	secure@citrix.com	https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788	Vendor Advisory

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	*

JSON

To clipboard

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        "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"
    }
  ],
  "sourceIdentifier": "secure@citrix.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ],
      "source": "secure@citrix.com",
      "type": "Secondary"
    }
  ]
}

ncsc-2025-0203

Vulnerability from csaf_ncscnl

Published

2025-06-25 14:54

Modified

2025-06-25 14:54

Summary

Kwetsbaarheid verholpen in Citrix NetScaler ADC en NetScaler Gateway

Notes

The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.

Feiten

Citrix heeft een kwetsbaarheid verholpen in NetScaler ADC en NetScaler Gateway. Om kwetsbaar te zijn moet NetScaler worden geconfigureerd als Gateway (VPN-virtuele server, ICA Proxy, CVPN, RDP Proxy) of AAA virtual server. Let op, dit is vaak default config.

Interpretaties

De kwetsbaarheid bevindt zich in de manier waarop geheugen wordt beheerd in NetScaler ADC en NetScaler Gateway. Dit kan leiden tot ongewenste 'control flow' en 'Denial-of-Service' situaties, vooral wanneer de producten zijn geconfigureerd als Gateway of AAA virtuele servers. De impact kan bestaan uit serviceonderbrekingen en aangetaste systeemintegriteit. Citrix meldt dat er exploits op niet-gemitigeerde systemen zijn waargenomen. Het NCSC adviseert organisaties met klem om de door Citrix beschikbaar gestelde beveiligingsupdate op korte termijn te installeren.

Oplossingen

Citrix heeft updates uitgebracht om de kwetsbaarheid te verhelpen. Zie bijgevoegde referenties voor meer informatie.

Kans

high

Schade

high

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

JSON

To clipboard

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "Citrix heeft een kwetsbaarheid verholpen in NetScaler ADC en NetScaler Gateway.\n\nOm kwetsbaar te zijn moet NetScaler worden geconfigureerd als Gateway (VPN-virtuele server, ICA Proxy, CVPN, RDP Proxy) of AAA virtual server. Let op, dit is vaak default config.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheid bevindt zich in de manier waarop geheugen wordt beheerd in NetScaler ADC en NetScaler Gateway. Dit kan leiden tot ongewenste \u0027control flow\u0027 en \u0027Denial-of-Service\u0027 situaties, vooral wanneer de producten zijn geconfigureerd als Gateway of AAA virtuele servers. De impact kan bestaan uit serviceonderbrekingen en aangetaste systeemintegriteit. Citrix meldt dat er exploits op niet-gemitigeerde systemen zijn waargenomen. \nHet NCSC adviseert organisaties met klem om de door Citrix beschikbaar gestelde beveiligingsupdate op korte termijn te installeren.\n",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Citrix heeft updates uitgebracht om de kwetsbaarheid te verhelpen. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Improper Restriction of Operations within the Bounds of a Memory Buffer",
        "title": "CWE-119"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference - cveprojectv5; nvd",
        "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788"
      }
    ],
    "title": "Kwetsbaarheid verholpen in Citrix NetScaler ADC en NetScaler Gateway",
    "tracking": {
      "current_release_date": "2025-06-25T14:54:38.413413Z",
      "generator": {
        "date": "2025-06-05T14:45:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.1"
        }
      },
      "id": "NCSC-2025-0203",
      "initial_release_date": "2025-06-25T14:54:38.413413Z",
      "revision_history": [
        {
          "date": "2025-06-25T14:54:38.413413Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:patch/13.1fipsandndcpp|\u003c37.236",
                "product": {
                  "name": "vers:patch/13.1fipsandndcpp|\u003c37.236",
                  "product_id": "CSAFPID-2939212"
                }
              },
              {
                "category": "product_version_range",
                "name": "vers:patch/13.1|\u003c59.19",
                "product": {
                  "name": "vers:patch/13.1|\u003c59.19",
                  "product_id": "CSAFPID-2939211"
                }
              },
              {
                "category": "product_version_range",
                "name": "vers:patch/14.1|\u003c47.46",
                "product": {
                  "name": "vers:patch/14.1|\u003c47.46",
                  "product_id": "CSAFPID-2939210"
                }
              }
            ],
            "category": "product_name",
            "name": "ADC"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:patch/13.1|\u003c59.19",
                "product": {
                  "name": "vers:patch/13.1|\u003c59.19",
                  "product_id": "CSAFPID-2939214"
                }
              },
              {
                "category": "product_version_range",
                "name": "vers:patch/13.1fipsandndcpp|\u003c37.236",
                "product": {
                  "name": "vers:patch/13.1fipsandndcpp|\u003c37.236",
                  "product_id": "CSAFPID-2939215"
                }
              },
              {
                "category": "product_version_range",
                "name": "vers:patch/14.1|\u003c47.46",
                "product": {
                  "name": "vers:patch/14.1|\u003c47.46",
                  "product_id": "CSAFPID-2939213"
                }
              }
            ],
            "category": "product_name",
            "name": "Gateway"
          }
        ],
        "category": "vendor",
        "name": "NetScaler"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-6543",
      "cwe": {
        "id": "CWE-119",
        "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Restriction of Operations within the Bounds of a Memory Buffer",
          "title": "CWE-119"
        },
        {
          "category": "general",
          "text": "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",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-2939212",
          "CSAFPID-2939211",
          "CSAFPID-2939210",
          "CSAFPID-2939214",
          "CSAFPID-2939215",
          "CSAFPID-2939213"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-6543 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2025/cve-2025-6543.json"
        }
      ],
      "title": "CVE-2025-6543"
    }
  ]
}

ghsa-9gqr-6728-fpv3

Vulnerability from github

Published

2025-06-26 21:31

Modified

2025-07-01 18:30

Severity ?

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.2 (Critical) - 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

Details

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-6543"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-119"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-25T13:15:27Z",
    "severity": "CRITICAL"
  },
  "details": "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",
  "id": "GHSA-9gqr-6728-fpv3",
  "modified": "2025-07-01T18:30:33Z",
  "published": "2025-06-26T21:31:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6543"
    },
    {
      "type": "WEB",
      "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

CVE-2025-6543 (GCVE-0-2025-6543)

Vulnerability from cvelistv5

CISA Known exploited vulnerability

Data from the Known Exploited Vulnerabilities Catalog

fkie_cve-2025-6543

Vulnerability from fkie_nvd

ncsc-2025-0203

Vulnerability from csaf_ncscnl

ghsa-9gqr-6728-fpv3

Vulnerability from github

Tags

Sightings

Nomenclature