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thunderbird — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2020-15646

If an attacker intercepts Thunderbird's initial attempt to perform automatic account setup using the Microsoft Exchange autodiscovery mechanism, and the attacker sends a crafted response, then Thunderbird sends username and password over https to a server controlled by the attacker. This vulnerability affects Thunderbird < 68.10.0.

Products
thunderbird
Affected versions
Not specified
Fixed versions
1:68.10.0-1
CVEs
CVE-2020-15646
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 13:26 UTC · Revision 1

Source evidence

DEBIAN-CVE-2020-15646

core-osv · Original source

Published 8 Oct 2020, 14:15 UTC

If an attacker intercepts Thunderbird's initial attempt to perform automatic account setup using the Microsoft Exchange autodiscovery mechanism, and the attacker sends a crafted response, then Thunderbird sends username and password over https to a server controlled by the attacker. This vulnerability affects Thunderbird < 68.10.0.

osv:DEBIAN-CVE-2020-15646

thunderbird

Fixed versions: 1:68.10.0-1

thunderbird

Fixed versions: 1:68.10.0-1

thunderbird

Fixed versions: 1:68.10.0-1

Complete source record
{
  "id": "39beb1a7b5f95072e51f1207ab73bfc170af7d00bc55fc81e20cc61525f07a26",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-15646",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2020-15646",
    "summary": "If an attacker intercepts Thunderbird's initial attempt to perform automatic account setup using the Microsoft Exchange autodiscovery mechanism, and the attacker sends a crafted response, then Thunderbird sends username and password over https to a server controlled by the attacker. This vulnerability affects Thunderbird < 68.10.0.",
    "evidence": "osv:DEBIAN-CVE-2020-15646",
    "products": [
      {
        "name": {
          "value": "thunderbird",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1:68.10.0-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "thunderbird",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1:68.10.0-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "thunderbird",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1:68.10.0-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2020-15646",
      "aliases": [
        "DEBIAN-CVE-2020-15646"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1:68.10.0-1"
                }
              ]
            }
          ],
          "package": {
            "name": "thunderbird",
            "purl": "pkg:deb/debian/thunderbird?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-15646.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1:68.10.0-1"
                }
              ]
            }
          ],
          "package": {
            "name": "thunderbird",
            "purl": "pkg:deb/debian/thunderbird?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-15646.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1:68.10.0-1"
                }
              ]
            }
          ],
          "package": {
            "name": "thunderbird",
            "purl": "pkg:deb/debian/thunderbird?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-15646.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T12:02:26.942974658Z",
      "provider": "osv",
      "upstream": [
        "CVE-2020-15646"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2020-15646"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2020-15646",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 452216,
  "published_at": "2020-10-08T14:15:12.483+00:00"
}