{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-30255",
        "ASSIGNER": "security-advisories@github.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Envoy is a cloud-native, open source edge and service proxy. The HTTP/2 protocol stack in Envoy versions prior to 1.29.3, 1.28.2, 1.27.4, and 1.26.8 are vulnerable to CPU exhaustion due to flood of CONTINUATION frames. Envoy's HTTP/2 codec allows the client to send an unlimited number of CONTINUATION frames even after exceeding Envoy's header map limits. This allows an attacker to send a sequence of CONTINUATION frames without the END_HEADERS bit set causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic and culminating in denial of service through CPU exhaustion. Users should upgrade to version 1.29.3, 1.28.2, 1.27.4, or 1.26.8 to mitigate the effects of the CONTINUATION flood. As a workaround, disable HTTP/2 protocol for downstream connections."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-390: Detection of Error Condition Without Action",
                        "cweId": "CWE-390"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "envoyproxy",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "envoy",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": ">= 1.29.0, < 1.29.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": ">= 1.28.0, < 1.28.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": ">= 1.27.0, < 1.27.4"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "< 1.26.8"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm",
                "refsource": "MISC",
                "name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm"
            },
            {
                "url": "http://www.openwall.com/lists/oss-security/2024/04/05/3",
                "refsource": "MISC",
                "name": "http://www.openwall.com/lists/oss-security/2024/04/05/3"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-j654-3ccm-vfmm",
        "discovery": "UNKNOWN"
    },
    "impact": {
        "cvss": [
            {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                "version": "3.1"
            }
        ]
    }
}