FKIE_CVE-2025-15346

Vulnerability from fkie_nvd - Published: 2026-01-08 00:15 - Updated: 2026-10-07 09:10
Severity
9.3 (Critical) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/AU:Y
Summary
A vulnerability in the handling of verify_mode = CERT_REQUIRED in the wolfssl Python package (wolfssl-py) causes client certificate requirements to not be fully enforced.  Because the WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT flag was not included, the behavior effectively matched CERT_OPTIONAL: a peer certificate was verified if presented, but connections were incorrectly authenticated when no client certificate was provided.  This results in improper authentication, allowing attackers to bypass mutual TLS (mTLS) client authentication by omitting a client certificate during the TLS handshake.  The issue affects versions up to and including 5.8.2.
References
facts@wolfssl.comhttps://github.com/wolfSSL/wolfssl-py/commit/b4517dece79f682a8f453abce5cfc0b81bae769d
facts@wolfssl.comhttps://github.com/wolfSSL/wolfssl-py/pull/62
facts@wolfssl.comhttps://github.com/wolfSSL/wolfssl-py/releases/tag/v5.8.4-stable
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://pypi.org/",
          "defaultStatus": "unaffected",
          "modules": [
            "TLS Peer Certificate Verification (CERT_REQUIRED verify mode)"
          ],
          "packageName": "wolfssl",
          "platforms": [
            "Linux",
            "MacOS",
            "Windows"
          ],
          "product": "wolfSSL-py",
          "programFiles": [
            "wolfssl/__init__.py"
          ],
          "repo": "https://github.com/wolfSSL/wolfssl-py",
          "vendor": "wolfSSL",
          "versions": [
            {
              "lessThanOrEqual": "5.8.2",
              "status": "affected",
              "version": "5.3.0",
              "versionType": "python"
            }
          ]
        }
      ],
      "source": "facts@wolfssl.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the handling of verify_mode = CERT_REQUIRED in the wolfssl Python package (wolfssl-py) causes client certificate requirements to not be fully enforced.\u00a0\n\nBecause the WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT flag was not included, the behavior effectively matched CERT_OPTIONAL: a peer certificate was verified if presented, but connections were incorrectly authenticated when no client certificate was provided.\u00a0\n\nThis results in improper authentication, allowing attackers to bypass mutual TLS (mTLS) client authentication by omitting a client certificate during the TLS handshake.\u00a0\n\nThe issue affects versions up to and including 5.8.2."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el manejo de verify_mode = CERT_REQUIRED en el paquete Python wolfssl (wolfssl-py) causa que los requisitos de certificado de cliente no se apliquen completamente.\n\nDebido a que la bandera WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT no fue incluida, el comportamiento coincidi\u00f3 efectivamente con CERT_OPTIONAL: un certificado de par fue verificado si se present\u00f3, pero las conexiones fueron autenticadas incorrectamente cuando no se proporcion\u00f3 ning\u00fan certificado de cliente.\n\nEsto resulta en una autenticaci\u00f3n impropia, permitiendo a los atacantes eludir la autenticaci\u00f3n de cliente de TLS mutuo (mTLS) al omitir un certificado de cliente durante el handshake TLS.\n\nEl problema afecta a las versiones hasta la 5.8.2 inclusive."
    }
  ],
  "id": "CVE-2025-15346",
  "lastModified": "2026-10-07T09:10:00.160",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "YES",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "facts@wolfssl.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-15346",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-01-08T19:22:43.022302Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-01-08T00:15:59.393",
  "references": [
    {
      "source": "facts@wolfssl.com",
      "url": "https://github.com/wolfSSL/wolfssl-py/commit/b4517dece79f682a8f453abce5cfc0b81bae769d"
    },
    {
      "source": "facts@wolfssl.com",
      "url": "https://github.com/wolfSSL/wolfssl-py/pull/62"
    },
    {
      "source": "facts@wolfssl.com",
      "url": "https://github.com/wolfSSL/wolfssl-py/releases/tag/v5.8.4-stable"
    }
  ],
  "sourceIdentifier": "facts@wolfssl.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        },
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ],
      "source": "facts@wolfssl.com",
      "type": "Secondary"
    }
  ]
}



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