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    "cveMetadata": {
        "cveId": "CVE-2023-27491",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2023-03-01T19:03:56.634Z",
        "datePublished": "2023-04-04T18:18:23.433Z",
        "dateUpdated": "2025-02-11T16:14:43.908Z"
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    "containers": {
        "cna": {
            "title": "Envoy forwards invalid Http2/Http3 downstream headers",
            "problemTypes": [
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                    "descriptions": [
                        {
                            "cweId": "CWE-20",
                            "lang": "en",
                            "description": "CWE-20: Improper Input Validation",
                            "type": "CWE"
                        }
                    ]
                }
            ],
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                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.4,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "LOW",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
                        "version": "3.1"
                    }
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            ],
            "references": [
                {
                    "name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp",
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                    ],
                    "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp"
                },
                {
                    "name": "https://datatracker.ietf.org/doc/html/rfc9113#section-8.3",
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                    "url": "https://datatracker.ietf.org/doc/html/rfc9113#section-8.3"
                },
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                    "name": "https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1",
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                    "url": "https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2"
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            ],
            "affected": [
                {
                    "vendor": "envoyproxy",
                    "product": "envoy",
                    "versions": [
                        {
                            "version": ">= 1.25.0, < 1.25.3",
                            "status": "affected"
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                        {
                            "version": ">= 1.24.0, < 1.24.4",
                            "status": "affected"
                        },
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                            "version": ">= 1.23.0, < 1.23.6",
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                "dateUpdated": "2023-04-04T18:18:23.433Z"
            },
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                    "lang": "en",
                    "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should reject malformed request lines. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, There is a possibility that non compliant HTTP/1 service may allow malformed requests, potentially leading to a bypass of security policies. This issue is fixed in versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9."
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                "advisory": "GHSA-5jmv-cw9p-f9rp",
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                    "dateUpdated": "2024-08-02T12:16:35.377Z"
                },
                "title": "CVE Program Container",
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                        "name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp",
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                        "url": "https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2"
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            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2025-02-11T16:14:39.480822Z",
                                "id": "CVE-2023-27491",
                                "options": [
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                                        "Exploitation": "poc"
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                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                ],
                "title": "CISA ADP Vulnrichment",
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