A key length flaw was found in Red Hat Ceph Storage. An attacker can exploit the fact that the key length is incorrectly passed in an encryption algorithm to create a non random key, which is weaker and can be exploited for loss of confidentiality and integrity on encrypted disks.
総合評価: CVE-2021-3979 は低リスク（37.8/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.42%、33 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
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 | 2026-06-15 | 0.27% | 0.42% | +0.14% |
| 2 | 2026-02-22 | 0.23% | 0.27% | +0.05% |
| 3 | 2026-02-21 | — | 0.23% | — |
EPSS の全履歴 （全 21 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 |
|---|---|---|---|---|---|---|
| 6.5 | 3.1 | MEDIUM |
|
3.9 | 2.5 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2021-3979 not yet assigned priority: Debian including 1 source packages (ceph), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-3979 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-3979 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2021-3979/ |
ubuntu
|
low | CVE-2021-3979 low priority: Ubuntu including 1 source packages (ceph), 14 status rows across 14 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): not-affected 9, released 3, ignored 2. | https://ubuntu.com/security/CVE-2021-3979 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| redhat | ceph_storage | 3.0 | cpe:2.3:a:redhat:ceph_storage:3.0:*:*:*:*:*:*:* |
| redhat | ceph_storage | 4.3 | cpe:2.3:a:redhat:ceph_storage:4.3:*:*:*:*:*:*:* |
| redhat | ceph_storage | 5.1 | cpe:2.3:a:redhat:ceph_storage:5.1:*:*:*:*:*:*:* |
| redhat | openshift_container_storage | 4.0 | cpe:2.3:a:redhat:openshift_container_storage:4.0:*:*:*:*:*:*:* |
| redhat | openshift_data_foundation | 4.0 | cpe:2.3:a:redhat:openshift_data_foundation:4.0:*:*:*:*:*:*:* |
| redhat | openstack_platform | 13.0 | cpe:2.3:a:redhat:openstack_platform:13.0:*:*:*:*:*:*:* |
| redhat | ceph_storage_for_ibm_z_systems | 4.0 | cpe:2.3:o:redhat:ceph_storage_for_ibm_z_systems:4.0:*:*:*:*:*:*:* |
| redhat | ceph_storage | 4.0 | cpe:2.3:a:redhat:ceph_storage:4.0:*:*:*:*:*:*:* |
| redhat | ceph_storage | 5.0 | cpe:2.3:a:redhat:ceph_storage:5.0:*:*:*:*:*:*:* |
| redhat | ceph_storage_for_power | 4.0 | cpe:2.3:a:redhat:ceph_storage_for_power:4.0:*:*:*:*:*:*:* |
| fedoraproject | fedora | 35 | cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* |
| fedoraproject | fedora | 37 | cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://access.redhat.com/security/cve/CVE-2021-3979 | Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2024788 | Issue Tracking Vendor Advisory |
| https://github.com/ceph/ceph/commit/47c33179f9a15ae95cc1579a421be89378602656 | Patch Third Party Advisory |
| https://github.com/ceph/ceph/pull/44765 | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2023/10/msg00034.html | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BPOK44BESMIFW6BIOGCN452AKKOIIT6Q/ | Mailing List |
| https://tracker.ceph.com/issues/54006 | Issue Tracking Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2025/09/msg00025.html |