FKIE_CVE-2023-6936

Vulnerability from fkie_nvd - Published: 2024-02-20 22:15 - Updated: 2026-06-17 06:51
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
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).
References
facts@wolfssl.comhttps://github.com/wolfSSL/wolfssl/pull/6949/Issue Tracking, Patch
facts@wolfssl.comhttps://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/wolfSSL/wolfssl/pull/6949/Issue Tracking, Patch
af854a3a-2127-422b-91ae-364da2661108https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
Impacted products
Vendor Product Version
wolfssl wolfssl *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "facts@wolfssl.com"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "product": "wolfssl",
          "vendor": "wolfssl",
          "versions": [
            {
              "lessThanOrEqual": "5.6.5",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "57DCDF61-F982-41D7-83BE-DDAEC85A797A",
              "versionEndExcluding": "5.6.6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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"
    },
    {
      "lang": "es",
      "value": "En wolfSSL anterior a 5.6.6, si las funciones de devoluci\u00f3n de llamada est\u00e1n habilitadas (a trav\u00e9s del indicador WOLFSSL_CALLBACKS), entonces un cliente TLS malicioso o un atacante de red puede desencadenar una sobrelectura del b\u00fafer en el mont\u00f3n de 5 bytes (WOLFSSL_CALLBACKS solo est\u00e1 destinado a la depuraci\u00f3n)."
    }
  ],
  "id": "CVE-2023-6936",
  "lastModified": "2026-06-17T06:51:43.160",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "facts@wolfssl.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-6936",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-08-27T14:22:41.353325Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-02-20T22:15:08.197",
  "references": [
    {
      "source": "facts@wolfssl.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/wolfSSL/wolfssl/pull/6949/"
    },
    {
      "source": "facts@wolfssl.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/wolfSSL/wolfssl/pull/6949/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
    }
  ],
  "sourceIdentifier": "facts@wolfssl.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-126"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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