{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1",
    "cveMetadata": {
        "cveId": "CVE-2023-6936",
        "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "state": "PUBLISHED",
        "assignerShortName": "wolfSSL",
        "dateReserved": "2023-12-18T22:01:24.437Z",
        "datePublished": "2024-02-20T21:52:02.441Z",
        "dateUpdated": "2025-03-26T16:28:30.322Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "modules": [
                        "TLS"
                    ],
                    "product": "wolfSSL",
                    "repo": "https://github.com/wolfSSL/wolfssl",
                    "vendor": "wolfSSL",
                    "versions": [
                        {
                            "lessThanOrEqual": "5.6.5",
                            "status": "affected",
                            "version": "0",
                            "versionType": "release bundle"
                        }
                    ]
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "To be vulnerable, wolfSSL callback functionality (which includes handshake and timeout callback functionality) must must be enabled with:<br><b><span style=\"background-color: transparent;\">CFLAGS=\"-DWOLFSSL_CALLBACKS\"</span></b><br><br>This option is disabled by default. The default configuration of wolfSSL is not vulnerable."
                        }
                    ],
                    "value": "To be vulnerable, wolfSSL callback functionality (which includes handshake and timeout callback functionality) must must be enabled with:\nCFLAGS=\"-DWOLFSSL_CALLBACKS\"\n\nThis option is disabled by default. The default configuration of wolfSSL is not vulnerable."
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "user": "00000000-0000-4000-9000-000000000000",
                    "value": "Lucca Hirschi (Inria, LORIA)"
                },
                {
                    "lang": "en",
                    "type": "finder",
                    "user": "00000000-0000-4000-9000-000000000000",
                    "value": "Steve Kremer (Inria, LORIA)"
                },
                {
                    "lang": "en",
                    "type": "finder",
                    "user": "00000000-0000-4000-9000-000000000000",
                    "value": "Max Ammann (Trail of Bits)"
                },
                {
                    "lang": "en",
                    "type": "tool",
                    "user": "00000000-0000-4000-9000-000000000000",
                    "value": "tlspuffin"
                }
            ],
            "datePublic": "2023-12-20T00:00:00.000Z",
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).<br>"
                        }
                    ],
                    "value": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\n"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                        "version": "3.1"
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
                "shortName": "wolfSSL",
                "dateUpdated": "2024-02-20T21:52:02.441Z"
            },
            "references": [
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/wolfSSL/wolfssl/pull/6949/"
                },
                {
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p><span style=\"background-color: transparent;\">The fix for this issue is located in the following GitHub Pull Request: </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/wolfSSL/wolfssl/pull/6949/\">https://github.com/wolfSSL/wolfssl/pull/6949/</a></p>"
                        }
                    ],
                    "value": "The fix for this issue is located in the following GitHub Pull Request:  https://github.com/wolfSSL/wolfssl/pull/6949/ https://github.com/wolfSSL/wolfssl/pull/6949/ \n\n"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "title": " Heap-buffer over-read with WOLFSSL_CALLBACKS",
            "workarounds": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<li>Do not build wolfSSL with <b>WOLFSSL_CALLBACKS</b> defined</li>"
                        }
                    ],
                    "value": "  *  Do not build wolfSSL with WOLFSSL_CALLBACKS defined\n"
                }
            ],
            "x_generator": {
                "engine": "Vulnogram 0.1.0-dev"
            }
        },
        "adp": [
            {
                "problemTypes": [
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-126",
                                "lang": "en",
                                "description": "CWE-126 Buffer Over-read"
                            }
                        ]
                    }
                ],
                "affected": [
                    {
                        "vendor": "wolfssl",
                        "product": "wolfssl",
                        "cpes": [
                            "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*"
                        ],
                        "defaultStatus": "unknown",
                        "versions": [
                            {
                                "version": "0",
                                "status": "affected",
                                "lessThanOrEqual": "5.6.5",
                                "versionType": "custom"
                            }
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2024-08-27T14:22:41.353325Z",
                                "id": "CVE-2023-6936",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2025-03-26T16:28:30.322Z"
                }
            },
            {
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2024-08-02T08:42:08.671Z"
                },
                "title": "CVE Program Container",
                "references": [
                    {
                        "tags": [
                            "patch",
                            "x_transferred"
                        ],
                        "url": "https://github.com/wolfSSL/wolfssl/pull/6949/"
                    },
                    {
                        "tags": [
                            "vendor-advisory",
                            "x_transferred"
                        ],
                        "url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
                    }
                ]
            }
        ]
    }
}