Vulnerability-Lookup

CERTFR-2026-ALE-011

Vulnerability from certfr_alerte - Published: 2026-09-28 - Updated: 2026-09-28

Le 27 septembre 2026, Citrix a publié un avis de sécurité concernant plusieurs vulnérabilités qui affectent NetScaler ADC et Gateway. Parmi celles-ci, les vulnérabilités CVE-2026-88771 et CVE-2026-88772 permettent une exécution de code arbitraire à distance par un attaquant non authentifié.

Ces vulnérabilités sont activement exploitées et les exploitations ont commencé avant la disponibilité des correctifs.

De plus, l'éditeur indique que si les correctifs n'ont pas été installés, tous les équipements sont vulnérables dans leur configuration par défaut.

Dans son billet de blogue (cf. section Documentation), Citrix indique mettre des indicateurs de compromission à disposition de ses clients par le biais de la console Netscaler.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Citrix	NetScaler ADC	Citrix NetScaler ADC versions 14.1-FIPS antérieures à 14.1-73.37 FIPS
Citrix	NetScaler ADC	Citrix NetScaler ADC versions 13.1-FIPS antérieures à 13.1-NDcPP 13.1.37.279
Citrix	NetScaler Gateway	NetScaler Gateway versions 13.1.x antérieures à 13.1-64.23
Citrix	NetScaler Gateway	NetScaler Gateway versions 14.1.x antérieures à 14.1-73.37
Citrix	NetScaler ADC	Citrix NetScaler ADC versions 14.1.x antérieures à 14.1-73.37
Citrix	NetScaler ADC	Citrix NetScaler ADC versions 13.1.x antérieures à 13.1-64.23

References

Title

Publication Time

CVE-2026-88771 (GCVE-0-2026-88771)

Vulnerability from cvelistv5 – Published: 2026-09-27 16:02 – Updated: 2026-09-28 12:43

Title

A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands

Summary

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. 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 leading to an unauthenticated attacker to execute arbitrary commands.

Severity

9.5 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-28 12:43 UTC

CWE

CWE-20 - Improper input validation

Assigner

NetScaler mitre root

References

2 references

URL	Tags
https://support.citrix.com/support-home/kbsearch/…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

2 products

Vendor	Product	Version
Citrix NetScaler	ADC	Affected: 0 , < 14.1-73.37 (patch) Affected: 0 , < 13.1-64.23 (patch) Affected: 0 , < 14.1-73.37 FIPS (patch) Affected: 0 , < 13.1.37.279 FIPS and NDcPP (patch)
Citrix NetScaler	Gateway	Affected: 0 , < 14.1-73.37 (patch) Affected: 0 , < 13.1-64.23 (patch)

Date Public

2026-09-27 15:51

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-88771",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-28T12:43:00.920024Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2026-09-27",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771"
              },
              "type": "kev"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-28T12:43:09.700Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "datePublic": "2026-09-27T15:51:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.\u003cp\u003eThis 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 leading to\u0026nbsp;\u003cspan\u003ean unauthenticated attacker to execute arbitrary commands.\u0026nbsp;\u003c/span\u003e\u003c/p\u003e"
            }
          ],
          "value": "Improper input validation 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 leading to\u00a0an unauthenticated attacker to execute arbitrary commands."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 9.5,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20 Improper input validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-27T16:02:07.001Z",
        "orgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
        "shortName": "NetScaler"
      },
      "references": [
        {
          "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands",
      "x_generator": {
        "engine": "Vulnogram 1.0.4"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
    "assignerShortName": "NetScaler",
    "cveId": "CVE-2026-88771",
    "datePublished": "2026-09-27T16:02:07.001Z",
    "dateReserved": "2026-09-10T07:14:57.369Z",
    "dateUpdated": "2026-09-28T12:43:09.700Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-88772 (GCVE-0-2026-88772)

Vulnerability from cvelistv5 – Published: 2026-09-27 16:09 – Updated: 2026-09-28 03:55

Title

Memory overflow vulnerability leading to Remote Code Execution or Denial of Service

Summary

Vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. 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 leading to Remote Code Execution or Denial of Service

Severity

9.5 (Critical)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-27 00:00 UTC

CWE

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

Assigner

NetScaler mitre root

References

2 references

URL	Tags
https://support.citrix.com/support-home/kbsearch/…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

2 products

Vendor	Product	Version
Citrix NetScaler	ADC	Affected: 0 , < 14.1-73.37 (patch) Affected: 0 , < 13.1-64.23 (patch) Affected: 0 , < 14.1-73.37 FIPS (patch) Affected: 0 , < 13.1.37.279 FIPS and NDcPP (patch)
Citrix NetScaler	Gateway	Affected: 0 , < 14.1-73.37 (patch) Affected: 0 , < 13.1-64.23 (patch)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-88772",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-27T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2026-09-27",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88772"
              },
              "type": "kev"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-119",
                "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-28T03:55:42.777Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88772"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-09-27T00:00:00.000Z",
            "value": "CVE-2026-88772 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.\u003cp\u003eThis 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\u0026nbsp;\u003cspan\u003eleading to Remote Code Execution or Denial of Service\u003c/span\u003e\u003c/p\u003e"
            }
          ],
          "value": "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\u00a0leading to Remote Code Execution or Denial of Service"
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.5,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-27T16:09:56.033Z",
        "orgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
        "shortName": "NetScaler"
      },
      "references": [
        {
          "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096\u0026articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Memory overflow vulnerability leading to Remote Code Execution or Denial of Service",
      "x_generator": {
        "engine": "Vulnogram 1.0.4"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
    "assignerShortName": "NetScaler",
    "cveId": "CVE-2026-88772",
    "datePublished": "2026-09-27T16:09:56.033Z",
    "dateReserved": "2026-09-10T07:14:57.369Z",
    "dateUpdated": "2026-09-28T03:55:42.777Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CERTFR-2026-ALE-011

Solutions

CVE-2026-88771 (GCVE-0-2026-88771)

CVE-2026-88772 (GCVE-0-2026-88772)

Tags

Sightings

Nomenclature

Related by attack behaviour