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                "options": [
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          "type": "finder",
          "user": "00000000-0000-4000-9000-000000000000",
          "value": "Bernd Edlinger"
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          "lang": "en",
          "type": "remediation developer",
          "user": "00000000-0000-4000-9000-000000000000",
          "value": "Tomas Mraz"
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              "value": "Issue summary: Checking excessively long DH keys or parameters may be very slow.\u003cbr\u003e\u003cbr\u003eImpact summary: Applications that use the functions DH_check(), DH_check_ex()\u003cbr\u003eor EVP_PKEY_param_check() to check a DH key or DH parameters may experience long\u003cbr\u003edelays. Where the key or parameters that are being checked have been obtained\u003cbr\u003efrom an untrusted source this may lead to a Denial of Service.\u003cbr\u003e\u003cbr\u003eThe function DH_check() performs various checks on DH parameters. After fixing\u003cbr\u003eCVE-2023-3446 it was discovered that a large q parameter value can also trigger\u003cbr\u003ean overly long computation during some of these checks. A correct q value,\u003cbr\u003eif present, cannot be larger than the modulus p parameter, thus it is\u003cbr\u003eunnecessary to perform these checks if q is larger than p.\u003cbr\u003e\u003cbr\u003eAn application that calls DH_check() and supplies a key or parameters obtained\u003cbr\u003efrom an untrusted source could be vulnerable to a Denial of Service attack.\u003cbr\u003e\u003cbr\u003eThe function DH_check() is itself called by a number of other OpenSSL functions.\u003cbr\u003eAn application calling any of those other functions may similarly be affected.\u003cbr\u003eThe other functions affected by this are DH_check_ex() and\u003cbr\u003eEVP_PKEY_param_check().\u003cbr\u003e\u003cbr\u003eAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\u003cbr\u003ewhen using the \"-check\" option.\u003cbr\u003e\u003cbr\u003eThe OpenSSL SSL/TLS implementation is not affected by this issue.\u003cbr\u003e\u003cbr\u003eThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue."
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "Excessive time spent checking DH q parameter value",
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    "datePublished": "2023-07-31T15:34:13.627Z",
    "dateReserved": "2023-07-21T08:47:25.638Z",
    "dateUpdated": "2025-05-05T15:53:49.014Z",
    "state": "PUBLISHED"
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