{
  "cveId": "CVE-2021-23991",
  "url": "https://patchblox.com/security/cve/CVE-2021-23991",
  "summary": "CVE-2021-23991 is fixed in 7 products on 2 platforms, first by RHSA-2021:1193, released April 14, 2021. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Thunderbird: If a Thunderbird user has previously imported Alice\u0027s OpenPGP key, and Alice has extended the validity\u2026",
  "description": "If a Thunderbird user has previously imported Alice\u0027s OpenPGP key, and Alice has extended the validity period of her key, but Alice\u0027s updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice\u0027s key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird \u003C 78.9.1.",
  "published": "2021-04-12T17:00:00Z",
  "severity": "Moderate",
  "cvss": 6.8,
  "epss": 0.01035,
  "epssPercentile": 0.64116,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2021-23991",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-US)",
      "fixedVersion": "78.10.0",
      "fix": "Mozilla Thunderbird (en-US) 78.10.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird-78.10.0",
      "released": "2021-04-15T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird",
      "release": "RHEL 8",
      "fixedVersion": "0:78.9.1-1.el8_3",
      "fix": "RHSA-2021:1193",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-1193",
      "released": "2021-04-14T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "fix": "thunderbird 1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-thunderbird-1-78.11.0-build1-0ubuntu0.18.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "fix": "thunderbird 1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-thunderbird-1-78.11.0-build1-0ubuntu0.20.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird",
      "release": "ol 8",
      "fixedVersion": "0:78.9.1-1.0.1.el8_3",
      "fix": "ELSA-2021-1193",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-1193",
      "released": "2021-04-15T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird-gnome-support",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "fix": "thunderbird-gnome-support 1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-78.11.0-build1-0ubuntu0.18.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird-gnome-support",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "fix": "thunderbird-gnome-support 1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-78.11.0-build1-0ubuntu0.20.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird-mozsymbols",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "fix": "thunderbird-mozsymbols 1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-78.11.0-build1-0ubuntu0.18.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird-mozsymbols",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "fix": "thunderbird-mozsymbols 1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-78.11.0-build1-0ubuntu0.20.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xul-ext-calendar-timezones",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "fix": "xul-ext-calendar-timezones 1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-78.11.0-build1-0ubuntu0.18.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xul-ext-calendar-timezones",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "fix": "xul-ext-calendar-timezones 1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-78.11.0-build1-0ubuntu0.20.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xul-ext-gdata-provider",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "fix": "xul-ext-gdata-provider 1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-78.11.0-build1-0ubuntu0.18.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xul-ext-gdata-provider",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "fix": "xul-ext-gdata-provider 1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-78.11.0-build1-0ubuntu0.20.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xul-ext-lightning",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "fix": "xul-ext-lightning 1:78.11.0\u002Bbuild1-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-xul-ext-lightning-1-78.11.0-build1-0ubuntu0.18.04.2",
      "released": "2021-06-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xul-ext-lightning",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "fix": "xul-ext-lightning 1:78.11.0\u002Bbuild1-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-xul-ext-lightning-1-78.11.0-build1-0ubuntu0.20.04.2",
      "released": "2021-06-01T17:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}