ubuntu-cve-2020-28200
Vulnerability from osv_ubuntu
Published
2021-06-21 12:00
Modified
2026-04-22 07:39
Summary
Details

The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          },
          {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "dovecot",
        "purl": "pkg:deb/ubuntu/dovecot@1:2.2.9-1ubuntu2.6+esm4?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.1.7-7ubuntu3",
        "1:2.2.9-1ubuntu1",
        "1:2.2.9-1ubuntu2",
        "1:2.2.9-1ubuntu2.1",
        "1:2.2.9-1ubuntu2.3",
        "1:2.2.9-1ubuntu2.4",
        "1:2.2.9-1ubuntu2.5",
        "1:2.2.9-1ubuntu2.6",
        "1:2.2.9-1ubuntu2.6+esm1",
        "1:2.2.9-1ubuntu2.6+esm2",
        "1:2.2.9-1ubuntu2.6+esm3",
        "1:2.2.9-1ubuntu2.6+esm4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-lucene",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          },
          {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.2.22-1ubuntu2.14"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "dovecot",
        "purl": "pkg:deb/ubuntu/dovecot@1:2.2.22-1ubuntu2.14?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.2.18-2ubuntu2",
        "1:2.2.22-1ubuntu1",
        "1:2.2.22-1ubuntu2",
        "1:2.2.22-1ubuntu2.1",
        "1:2.2.22-1ubuntu2.2",
        "1:2.2.22-1ubuntu2.3",
        "1:2.2.22-1ubuntu2.4",
        "1:2.2.22-1ubuntu2.6",
        "1:2.2.22-1ubuntu2.7",
        "1:2.2.22-1ubuntu2.8",
        "1:2.2.22-1ubuntu2.9",
        "1:2.2.22-1ubuntu2.10",
        "1:2.2.22-1ubuntu2.11",
        "1:2.2.22-1ubuntu2.12",
        "1:2.2.22-1ubuntu2.13",
        "1:2.2.22-1ubuntu2.14"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          },
          {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "dovecot",
        "purl": "pkg:deb/ubuntu/dovecot@1:2.2.33.2-1ubuntu4.8?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.2.27-3ubuntu1",
        "1:2.2.33.2-1ubuntu1",
        "1:2.2.33.2-1ubuntu2",
        "1:2.2.33.2-1ubuntu3",
        "1:2.2.33.2-1ubuntu4",
        "1:2.2.33.2-1ubuntu4.1",
        "1:2.2.33.2-1ubuntu4.2",
        "1:2.2.33.2-1ubuntu4.3",
        "1:2.2.33.2-1ubuntu4.4",
        "1:2.2.33.2-1ubuntu4.5",
        "1:2.2.33.2-1ubuntu4.6",
        "1:2.2.33.2-1ubuntu4.7",
        "1:2.2.33.2-1ubuntu4.8"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-lucene",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          },
          {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "dovecot",
        "purl": "pkg:deb/ubuntu/dovecot@1:2.3.7.2-1ubuntu3.7?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.3.4.1-5ubuntu3",
        "1:2.3.7.2-1ubuntu1",
        "1:2.3.7.2-1ubuntu2",
        "1:2.3.7.2-1ubuntu3",
        "1:2.3.7.2-1ubuntu3.1",
        "1:2.3.7.2-1ubuntu3.2",
        "1:2.3.7.2-1ubuntu3.3",
        "1:2.3.7.2-1ubuntu3.4",
        "1:2.3.7.2-1ubuntu3.5",
        "1:2.3.7.2-1ubuntu3.6",
        "1:2.3.7.2-1ubuntu3.7"
      ]
    }
  ],
  "aliases": [],
  "details": "The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.",
  "id": "UBUNTU-CVE-2020-28200",
  "modified": "2026-04-22T07:39:37Z",
  "published": "2021-06-21T12:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-28200"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-28200"
    },
    {
      "type": "REPORT",
      "url": "https://dovecot.org/pipermail/dovecot-news/2021-June/000460.html"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-28200"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.