{
  "cveId": "CVE-2021-33560",
  "url": "https://patchblox.com/security/cve/CVE-2021-33560",
  "summary": "CVE-2021-33560 is fixed in 4 products on 1 platform, first by libgcrypt20 1.8.1-4ubuntu1.3, released September 6, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm and the window size is not chosen appropriately. This for example affects use of ElGamal in OpenPGP.",
  "description": "Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryptionbecause it lacks exponent blinding to address a side-channel attack againstmpi_powm, and the window size is not chosen appropriately. This, forexample, affects use of ElGamal in OpenPGP.",
  "published": "2021-06-08T04:15:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
  "cwe": "Observable Discrepancy",
  "epss": 0.0237,
  "epssPercentile": 0.83931,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33560",
  "fixes": [
    {
      "platform": "linux",
      "product": "libgcrypt",
      "release": "RHEL 8",
      "fixedVersion": "0:1.8.5-6.el8",
      "fix": "RHSA-2021:4409",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-4409",
      "released": "2021-11-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt",
      "release": "almalinux 8",
      "fixedVersion": "1.8.5-6.el8",
      "fix": "ALSA-2021:4409",
      "url": "https://patchblox.com/security/fix/linux/alsa-2021-4409",
      "released": "2021-11-09T09:18:49Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt",
      "release": "ol 8",
      "fixedVersion": "0:1.8.5-6.el8",
      "fix": "ELSA-2021-4409",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-4409",
      "released": "2021-11-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt",
      "release": "rocky 8",
      "fixedVersion": "0:1.8.5-6.el8",
      "fix": "RLSA-2021:4409",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2021-4409",
      "released": "2021-11-09T09:18:49Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt-bin",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1.8.7-5ubuntu2",
      "fix": "libgcrypt-bin 1.8.7-5ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libgcrypt-bin-1.8.7-5ubuntu2",
      "released": "2026-01-16T01:42:24Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt-devel",
      "release": "RHEL 8",
      "fixedVersion": "0:1.8.5-6.el8",
      "fix": "RHSA-2021:4409",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-4409",
      "released": "2021-11-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt-devel",
      "release": "almalinux 8",
      "fixedVersion": "1.8.5-6.el8",
      "fix": "ALSA-2021:4409",
      "url": "https://patchblox.com/security/fix/linux/alsa-2021-4409",
      "released": "2021-11-09T09:18:49Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt-devel",
      "release": "ol 8",
      "fixedVersion": "0:1.8.5-6.el8",
      "fix": "ELSA-2021-4409",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-4409",
      "released": "2021-11-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt20",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.8.1-4ubuntu1.3",
      "fix": "libgcrypt20 1.8.1-4ubuntu1.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libgcrypt20-1.8.1-4ubuntu1.3",
      "released": "2021-09-06T12:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt20",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.8.5-5ubuntu1.1",
      "fix": "libgcrypt20 1.8.5-5ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libgcrypt20-1.8.5-5ubuntu1.1",
      "released": "2021-09-06T12:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt20",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.8.7-5ubuntu2",
      "fix": "libgcrypt20 1.8.7-5ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libgcrypt20-1.8.7-5ubuntu2",
      "released": "2021-09-06T12:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt20",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "1.8.7-5ubuntu2",
      "fix": "libgcrypt20 1.8.7-5ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-libgcrypt20-1.8.7-5ubuntu2",
      "released": "2026-01-16T01:42:22Z"
    },
    {
      "platform": "linux",
      "product": "libgcrypt20",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1.8.7-5ubuntu2",
      "fix": "libgcrypt20 1.8.7-5ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libgcrypt20-1.8.7-5ubuntu2",
      "released": "2026-01-16T01:42:24Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}