CVE-2025-11936 (GCVE-0-2025-11936)
Vulnerability from cvelistv5
Published
2025-11-21 22:24
Modified
2025-11-21 22:24
Severity ?
6.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
CWE
  • CWE-20 - Improper Input Validation
Summary
Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.
References
Impacted products
Vendor Product Version
wolfSSL wolfSSL Version: v5.8.2
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          "programFiles": [
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          "vendor": "wolfSSL",
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          "type": "finder",
          "value": "Jaehun Lee, Pohang University of Science and Technology (POSTECH)"
        },
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          "type": "coordinator",
          "value": "Kyungmin Bae, Pohang University of Science and Technology (POSTECH)"
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      ],
      "impacts": [
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          "capecId": "CAPEC-217",
          "descriptions": [
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            "Recovery": "NOT_DEFINED",
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            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
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            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
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            "valueDensity": "NOT_DEFINED",
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              "value": "GENERAL"
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          "descriptions": [
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              "description": "CWE-20 Improper Input Validation",
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      "providerMetadata": {
        "dateUpdated": "2025-11-21T22:24:27.443Z",
        "orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "shortName": "wolfSSL"
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      "references": [
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          "url": "https://github.com/wolfSSL/wolfssl"
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        {
          "url": "https://github.com/wolfSSL/wolfssl/pull/9117"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 ClientHello",
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  "cveMetadata": {
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    "assignerShortName": "wolfSSL",
    "cveId": "CVE-2025-11936",
    "datePublished": "2025-11-21T22:24:27.443Z",
    "dateReserved": "2025-10-17T22:28:29.097Z",
    "dateUpdated": "2025-11-21T22:24:27.443Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}


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