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.
総合評価: CVE-2021-33582 は中リスク（60.3/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 3.07%、86 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-25 | 2.85% | 3.07% | +0.22% |
| 2 | 2026-06-15 | 1.02% | 2.85% | +1.83% |
| 3 | 2026-03-04 | — | 1.02% | — |
EPSS の全履歴 （全 30 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2021-33582 not yet assigned priority: Debian including 1 source packages (cyrus-imapd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-33582 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2021-33582 |
suse
|
high | CVE-2021-33582 severity important: SUSE including 14 source package names (cyradm-2.4.22-2.1, cyrus-imapd-2.3.11-60.65.71.6.1, …), 17 product×package rows across 4 product lines (SUSE Liberty Linux 8, SUSE Linux Enterprise Server 11 SP1-TERADATA, SUSE Linux Enterprise Server 11 SP3-TERADATA, openSUSE Tumbleweed): Fixed 17. | https://www.suse.com/security/cve/CVE-2021-33582/ |
ubuntu
|
medium | CVE-2021-33582 medium priority: Ubuntu including 2 source packages (cyrus-imapd, cyrus-imapd-2.4), 22 status rows across 11 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 10, not-affected 6, released 4, ignored 1, needed 1. | https://ubuntu.com/security/CVE-2021-33582 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| cyrus | imap | < 3.0.16 | cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:* |
| cyrus | imap | >= 3.2.0, < 3.2.8 | cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:* |
| cyrus | imap | >= 3.4.0, < 3.4.2 | cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 34 | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* |
| fedoraproject | fedora | 35 | cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://cyrus.topicbox.com/groups/announce/T3dde0a2352462975-M1386fc44adf967e072f8df13/cyrus-imap-3-4-2-3-2-8-and-3-0-16-released | Patch Vendor Advisory |
| https://github.com/cyrusimap/cyrus-imapd/commits/master | Patch Third Party Advisory |
| https://github.com/cyrusimap/cyrus-imapd/security/advisories | Not Applicable Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/06/msg00013.html | Mailing List Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HEO3RURJW6NLIXS7NK5PVU6MGHC4SCM/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WJZB45QBUN7CZFGOWCZYUYACNBTX7LVS/ | |
| https://www.cyrusimap.org/imap/download/release-notes/index.html | Patch Release Notes Vendor Advisory |