cvelist/2025/20xxx/CVE-2025-20621.json

{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2025-20621",
        "ASSIGNER": "responsibledisclosure@mattermost.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-1287: Improper Validation of Specified Type of Input",
                        "cweId": "CWE-1287"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Mattermost",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Mattermost",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "lessThanOrEqual": "10.2.0",
                                                        "status": "affected",
                                                        "version": "10.2.0",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "lessThanOrEqual": "9.11.5",
                                                        "status": "affected",
                                                        "version": "9.11.0",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "lessThanOrEqual": "10.0.3",
                                                        "status": "affected",
                                                        "version": "10.0.0",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "lessThanOrEqual": "10.1.3",
                                                        "status": "affected",
                                                        "version": "10.1.0",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "10.3.0"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "2.23.0"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "10.2.1"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "9.11.6"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "10.0.4"
                                                    },
                                                    {
                                                        "status": "unaffected",
                                                        "version": "10.1.4"
                                                    }
                                                ],
                                                "defaultStatus": "unaffected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://mattermost.com/security-updates",
                "refsource": "MISC",
                "name": "https://mattermost.com/security-updates"
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.2.0"
    },
    "source": {
        "advisory": "MMSA-2024-00390",
        "defect": [
            "https://mattermost.atlassian.net/browse/MM-61161"
        ],
        "discovery": "EXTERNAL"
    },
    "solution": [
        {
            "lang": "en",
            "supportingMedia": [
                {
                    "base64": false,
                    "type": "text/html",
                    "value": "<p>Update Mattermost to versions 10.3.0, 2.23.0, 10.2.1, 9.11.6, 10.0.4, 10.1.4 or higher.</p>"
                }
            ],
            "value": "Update Mattermost to versions 10.3.0, 2.23.0, 10.2.1, 9.11.6, 10.0.4, 10.1.4 or higher."
        }
    ],
    "credits": [
        {
            "lang": "en",
            "value": "c0rydoras (c0rydoras)"
        }
    ],
    "impact": {
        "cvss": [
            {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
            }
        ]
    }
}