Vulnerability-Lookup

FKIE_CVE-2021-22920

Vulnerability from fkie_nvd - Published: 2021-08-05 21:15 - Updated: 2026-06-17 03:38

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Summary

A vulnerability has been discovered in Citrix ADC (formerly known as NetScaler ADC) and Citrix Gateway (formerly known as NetScaler Gateway), and Citrix SD-WAN WANOP Edition models 4000-WO, 4100-WO, 5000-WO, and 5100-WO. These vulnerabilities, if exploited, could lead to a phishing attack through a SAML authentication hijack to steal a valid user session.

References

	URL	Tags
	support@hackerone.com	https://support.citrix.com/article/CTX319135	Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://support.citrix.com/article/CTX319135	Vendor Advisory

Impacted products

Vendor	Product	Version
citrix	application_delivery_management	12.1-62.25
citrix	application_delivery_management	13.0-82.42
citrix	gateway	12.1-62.25
citrix	gateway	13.0-82.42

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Citrix ADC, Citrix Gateway",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0"
            },
            {
              "status": "affected",
              "version": "Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1"
            }
          ]
        }
      ],
      "source": "support@hackerone.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:citrix:application_delivery_management:12.1-62.25:*:*:*:*:*:*:*",
              "matchCriteriaId": "DE311F5F-CD6A-4539-9941-B7F301BD29C3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:citrix:application_delivery_management:13.0-82.42:*:*:*:*:*:*:*",
              "matchCriteriaId": "ECDB150A-DC10-4C05-A75A-5EA94E3AE84D",
              "vulnerable": true
            },
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              "matchCriteriaId": "20180A94-DDD7-4EC0-9636-158B935B0938",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "3FF01A30-0E92-43CD-B1BE-B2051EF7B0A6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability has been discovered in Citrix ADC (formerly known as NetScaler ADC) and Citrix Gateway (formerly known as NetScaler Gateway), and Citrix SD-WAN WANOP Edition models 4000-WO, 4100-WO, 5000-WO, and 5100-WO. These vulnerabilities, if exploited, could lead to a phishing attack through a SAML authentication hijack to steal a valid user session."
    },
    {
      "lang": "es",
      "value": "Se ha detectado una vulnerabilidad en Citrix ADC (antes conocido como NetScaler ADC) y Citrix Gateway (antes conocido como NetScaler Gateway), y en los modelos 4000-WO, 4100-WO, 5000-WO y 5100-WO de Citrix SD-WAN WANOP Edition. Estas vulnerabilidades, si son explotadas, podr\u00edan conllevar a un ataque de phishing mediante un secuestro de autenticaci\u00f3n SAML para robar una sesi\u00f3n de usuario v\u00e1lida"
    }
  ],
  "id": "CVE-2021-22920",
  "lastModified": "2026-06-17T03:38:01.577",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-08-05T21:15:11.083",
  "references": [
    {
      "source": "support@hackerone.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.citrix.com/article/CTX319135"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.citrix.com/article/CTX319135"
    }
  ],
  "sourceIdentifier": "support@hackerone.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ],
      "source": "support@hackerone.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-22920 (GCVE-0-2021-22920)

Vulnerability from cvelistv5 – Published: 2021-08-05 20:16 – Updated: 2024-08-03 18:58

Summary

Severity

No CVSS data available.

CWE

CWE-284 - Improper Access Control - Generic (CWE-284)

Assigner

hackerone mitre root

References

1 reference

URL	Tags
https://support.citrix.com/article/CTX319135	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	Citrix ADC, Citrix Gateway	Affected: Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0 Affected: Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1

Show details on NVD website

JSON

To clipboard

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            "url": "https://support.citrix.com/article/CTX319135"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "versions": [
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        }
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        "CVE_data_meta": {
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}

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.

Detection rules are retrieved from Rulezet.

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.