Show plain JSON{"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/"}]}]}} 
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