{
  "cveId": "CVE-2019-1559",
  "url": "https://patchblox.com/security/cve/CVE-2019-1559",
  "summary": "CVE-2019-1559 is fixed in 2 products on 1 platform, first by libssl1.0.0 1.0.2n-1ubuntu5.3, released February 25, 2019. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libssl1.0.0: If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify,...",
  "description": "If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable \u0022non-stitched\u0022 ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).",
  "published": "2019-02-25T16:00:00Z",
  "severity": "Medium",
  "epss": 0.17139,
  "epssPercentile": 0.97105,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libssl1.0.0",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.0.2n-1ubuntu5.3",
      "fix": "libssl1.0.0 1.0.2n-1ubuntu5.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.3",
      "released": "2019-02-25T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "openssl1.0",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.0.2n-1ubuntu5.3",
      "fix": "openssl1.0 1.0.2n-1ubuntu5.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-openssl1.0-1.0.2n-1ubuntu5.3",
      "released": "2019-02-25T16:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}