ubuntu-cve-2021-33582
Vulnerability from osv_ubuntu
Published
2021-09-01 00:00
Modified
2026-04-22 07:40
Summary
Details

Cyrus IMAP before 3.4.2 allows remote attackers to cause a denial of service (multiple-minute daemon hang) via input that is mishandled during hash-table interaction. Because there are many insertions into a single bucket, strcmp becomes slow. This is fixed in 3.4.2, 3.2.8, and 3.0.16.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "cyrus-admin",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-admin-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-clients",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-clients-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-common",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-common-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-dev-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-doc-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-imapd",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-imapd-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-murder",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-murder-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-nntpd",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-nntpd-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-pop3d",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-pop3d-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-replication",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "cyrus-replication-2.4",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "libcyrus-imap-perl",
            "binary_version": "2.4.18-3"
          },
          {
            "binary_name": "libcyrus-imap-perl24",
            "binary_version": "2.4.18-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "cyrus-imapd-2.4",
        "purl": "pkg:deb/ubuntu/cyrus-imapd-2.4@2.4.18-3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.17+caldav~beta10-18",
        "2.4.17+nocaldav-2",
        "2.4.18-3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "cyrus-admin",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "cyrus-caldav",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "cyrus-clients",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "cyrus-common",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "cyrus-imapd",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "cyrus-murder",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "cyrus-nntpd",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "cyrus-pop3d",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "cyrus-replication",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          },
          {
            "binary_name": "libcyrus-imap-perl",
            "binary_version": "2.5.10-3ubuntu1.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "cyrus-imapd",
        "purl": "pkg:deb/ubuntu/cyrus-imapd@2.5.10-3ubuntu1.1+esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.10-3ubuntu1.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.10-3build1",
        "2.5.10-3build2",
        "2.5.10-3ubuntu1",
        "2.5.10-3ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "cyrus-admin",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "cyrus-caldav",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "cyrus-clients",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "cyrus-common",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "cyrus-imapd",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "cyrus-murder",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "cyrus-nntpd",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "cyrus-pop3d",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "cyrus-replication",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "libcyrus-imap-perl",
            "binary_version": "3.0.13-5ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "cyrus-imapd",
        "purl": "pkg:deb/ubuntu/cyrus-imapd@3.0.13-5ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.13-5ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.11-1",
        "3.0.11-1build1",
        "3.0.12-1",
        "3.0.12-2",
        "3.0.12-2ubuntu2",
        "3.0.12-2ubuntu3",
        "3.0.13-2ubuntu1",
        "3.0.13-3ubuntu1",
        "3.0.13-4ubuntu1",
        "3.0.13-5"
      ]
    }
  ],
  "aliases": [],
  "details": "Cyrus IMAP before 3.4.2 allows remote attackers to cause a denial of service (multiple-minute daemon hang) via input that is mishandled during hash-table interaction. Because there are many insertions into a single bucket, strcmp becomes slow. This is fixed in 3.4.2, 3.2.8, and 3.0.16.",
  "id": "UBUNTU-CVE-2021-33582",
  "modified": "2026-04-22T07:40:04Z",
  "published": "2021-09-01T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33582"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cyrusimap/cyrus-imapd/commit/93901789300aeefbe5c5829f2ab938e567a796dd"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cyrusimap/cyrus-imapd/commit/768b3aa4f51b636f0c591b6b34dd96aab9ce0136"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cyrusimap/cyrus-imapd/commit/3411deb448d29f4d287e90272dfa70d6f067ca67"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cyrusimap/cyrus-imapd/commit/810bb164a805395cd7a42412644f1d595e6b105e"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cyrusimap/cyrus-imapd/commit/943d4c37a063d2cf3384a88df9b884a167c04468"
    },
    {
      "type": "REPORT",
      "url": "https://www.cyrusimap.org/imap/download/release-notes/3.2/x/3.2.8.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cyrusimap.org/imap/download/release-notes/3.4/x/3.4.2.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cyrusimap.org/imap/download/release-notes/3.2/x/3.2.8.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.16.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-33582"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7224-1"
    }
  ],
  "related": [
    "USN-7224-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-33582"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.