{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-4239",
        "ASSIGNER": "security@golang.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "The Noise protocol implementation suffers from weakened cryptographic security after encrypting 2^64 messages, and a potential denial of service attack. After 2^64 (~18.4 quintillion) messages are encrypted with the Encrypt function, the nonce counter will wrap around, causing multiple messages to be encrypted with the same key and nonce. In a separate issue, the Decrypt function increments the nonce state even when it fails to decrypt a message. If an attacker can provide an invalid input to the Decrypt function, this will cause the nonce state to desynchronize between the peers, resulting in a failure to encrypt all subsequent messages."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE 400: Uncontrolled Resource Consumption"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "github.com/flynn/noise",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "github.com/flynn/noise",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "0",
                                            "version_affected": "="
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://github.com/flynn/noise/pull/44",
                "refsource": "MISC",
                "name": "https://github.com/flynn/noise/pull/44"
            },
            {
                "url": "https://pkg.go.dev/vuln/GO-2022-0425",
                "refsource": "MISC",
                "name": "https://pkg.go.dev/vuln/GO-2022-0425"
            }
        ]
    }
}