{
  "cveId": "CVE-2023-6237",
  "url": "https://patchblox.com/security/cve/CVE-2023-6237",
  "summary": "CVE-2023-6237 is fixed in 27 products on 1 platform, first by libssl3t64 3.0.10-1ubuntu4, released January 15, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libssl3t64: Issue summary: Checking excessively long invalid RSA public keys may takea long time.Impact summary: Applications tha...",
  "description": "Issue summary: Checking excessively long invalid RSA public keys may takea long time.Impact summary: Applications that use the function EVP_PKEY_public_check()to check RSA public keys may experience long delays. Where the key thatis being checked has been obtained from an untrusted source this may leadto a Denial of Service.When function EVP_PKEY_public_check() is called on RSA public keys,a computation is done to confirm that the RSA modulus, n, is composite.For valid RSA keys, n is a product of two or more large primes and thiscomputation completes quickly. However, if n is an overly large prime,then this computation would take a long time.An application that calls EVP_PKEY_public_check() and supplies an RSA keyobtained from an untrusted source could be vulnerable to a Denial ofServiceattack.The function EVP_PKEY_public_check() is not called from other OpenSSLfunctions however it is called from the OpenSSL pkey command lineapplication. For that reason that application is also vulnerable if usedwith the \u0027-pubin\u0027 and \u0027-check\u0027 options on untrusted data.The OpenSSL SSL/TLS implementation is not affected by this issue.The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.",
  "published": "2024-01-14T16:00:00Z",
  "severity": "Low",
  "cvss": 5.9,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.02303,
  "epssPercentile": 0.8343,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-qemu-efi-arm-2024.02-2ubuntu0.6",
      "released": "2025-08-12T08:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-efi-riscv64",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "2024.02-2ubuntu0.6",
      "fix": "qemu-efi-riscv64 2024.02-2ubuntu0.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-qemu-efi-riscv64-2024.02-2ubuntu0.6",
      "released": "2025-08-12T08:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}