CVE-2025-11934 (GCVE-0-2025-11934)
Vulnerability from cvelistv5
Published
2025-11-21 22:12
Modified
2025-11-21 22:12
Severity ?
2.1 (Low) - CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
CWE
  • CWE-20 - Improper Input Validation
Summary
Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.
References
Impacted products
Vendor Product Version
wolfSSL wolfSSL Version: v5.8.2
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        {
          "collectionURL": "https://www.wolfssl.com/download/",
          "defaultStatus": "unaffected",
          "modules": [
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          ],
          "packageName": "wolfssl",
          "platforms": [
            "Linux",
            "MacOS"
          ],
          "product": "wolfSSL",
          "programFiles": [
            "src/tls13.c"
          ],
          "repo": "https://github.com/wolfSSL/wolfssl",
          "vendor": "wolfSSL",
          "versions": [
            {
              "status": "affected",
              "version": "v5.8.2"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Jaehun Lee, Pohang University of Science and Technology (POSTECH)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Kyungmin Bae, Pohang University of Science and Technology (POSTECH)"
        }
      ],
      "descriptions": [
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          "supportingMedia": [
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              "value": "Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e"
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        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-217",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-217 Exploiting Incorrectly Configured SSL/TLS"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.1,
            "baseSeverity": "LOW",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "HIGH",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
            }
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20 Improper Input Validation",
              "lang": "en",
              "type": "CWE"
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          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-21T22:12:37.868Z",
        "orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "shortName": "wolfSSL"
      },
      "references": [
        {
          "url": "https://github.com/wolfSSL/wolfssl"
        },
        {
          "url": "https://github.com/wolfSSL/wolfssl/pull/9113"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Improper Validation of Signature Algorithm Used in TLS 1.3 CertificateVerify",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
    "assignerShortName": "wolfSSL",
    "cveId": "CVE-2025-11934",
    "datePublished": "2025-11-21T22:12:37.868Z",
    "dateReserved": "2025-10-17T22:20:27.618Z",
    "dateUpdated": "2025-11-21T22:12:37.868Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}


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