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CVE-2021-23155

Status: ModifiedMedium (6.8)—

Improper validation of the cloud certificate chain in Mobile Client allows man-in-the-middle attack to impersonate the legitimate Command Centre Server. This issue affects: Gallagher Command Centre Mobile Client for Android 8.60 versions prior to 8.60.065; version 8.50 and prior versions.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Gallagher — Command Centre Mobile Client

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-23155",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "disclosures@gallagher.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 9,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 2.2
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 4,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "disclosures@gallagher.com",
      "affectedData": [
        {
          "vendor": "Gallagher",
          "product": "Command Centre Mobile Client for Android",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom",
              "lessThanOrEqual": "8.50"
            },
            {
              "status": "affected",
              "version": "8.60",
              "lessThan": "8.60.065",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-11-18T18:15:08.330",
  "references": [
    {
      "url": "https://security.gallagher.com/Security-Advisories/CVE-2021-23155",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "disclosures@gallagher.com"
    },
    {
      "url": "https://security.gallagher.com/Security-Advisories/CVE-2021-23155",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "disclosures@gallagher.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-296"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper validation of the cloud certificate chain in Mobile Client allows man-in-the-middle attack to impersonate the legitimate Command Centre Server. This issue affects: Gallagher Command Centre Mobile Client for Android 8.60 versions prior to 8.60.065; version 8.50 and prior versions."
    },
    {
      "lang": "es",
      "value": "Una comprobación inapropiada de la cadena de certificados de la nube en el Cliente móvil permite que un ataque de tipo man-in-the-middle se haga pasar por el Servidor del Centro de Comando legítimo. Este problema afecta a: Gallagher Command Centre Mobile Client para Android versiones 8.60 anteriores a 8.60.065; versión 8.50 y anteriores."
    }
  ],
  "lastModified": "2026-06-17T03:38:21.100",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:gallagher:command_centre_mobile_client:*:*:*:*:*:android:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C0E99C53-6496-4B7C-B027-B8904ED34141",
              "versionEndIncluding": "8.50"
            },
            {
              "criteria": "cpe:2.3:a:gallagher:command_centre_mobile_client:*:*:*:*:*:android:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BFF34AAF-6EE9-44A4-92C8-54EABCCE0808",
              "versionEndExcluding": "8.60.065",
              "versionStartIncluding": "8.60"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "disclosures@gallagher.com"
}