{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-21401",
        "STATE": "PUBLIC",
        "TITLE": "Invalid free() call in Nanopb"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "nanopb",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": ">= 0.3.2, <= 0.3.9.7"
                                        },
                                        {
                                            "version_value": ">= 0.4.0, <= 0.4.4"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "nanopb"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid `free()` or `realloc()` calls if the message type contains an `oneof` field, and the `oneof` directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-763: Release of Invalid Pointer or Reference"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88",
                "refsource": "CONFIRM",
                "url": "https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88"
            },
            {
                "name": "https://github.com/nanopb/nanopb/issues/647",
                "refsource": "MISC",
                "url": "https://github.com/nanopb/nanopb/issues/647"
            },
            {
                "name": "https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261",
                "refsource": "MISC",
                "url": "https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261"
            },
            {
                "name": "https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1",
                "refsource": "MISC",
                "url": "https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-7mv5-5mxh-qg88",
        "discovery": "UNKNOWN"
    }
}