LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to create a digitally signed ODF document, by manipulating the documentsignatures.xml or macrosignatures.xml stream within the document to combine multiple certificate data, which when opened caused LibreOffice to display a validly signed indicator but whose content was unrelated to the signature shown. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.
総合評価: CVE-2021-25633 は中リスク（47.3/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.71%、48 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 | 2026-06-15 | 0.39% | 0.71% | +0.32% |
| 2 | 2026-05-30 | 0.53% | 0.39% | -0.14% |
| 3 | 2026-03-02 | — | 0.53% | — |
EPSS の全履歴 （全 16 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 |
|---|---|---|---|
alpine
|
high | CVE-2021-25633: 1 source package rows (libreoffice); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. | https://security.alpinelinux.org/vuln/CVE-2021-25633 |
debian
|
not yet assigned | CVE-2021-25633 not yet assigned priority: Debian including 1 source packages (libreoffice), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-25633 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-25633 |
suse
|
medium | CVE-2021-25633 severity moderate: SUSE including 89 source package names (libreoffice, libreoffice-base, …), 141 product×package rows across 2 product lines (SUSE Linux Enterprise Workstation Extension 12 SP5, SUSE Linux Enterprise Workstation Extension 15 SP2): Known Not Affected 141. | https://www.suse.com/security/cve/CVE-2021-25633/ |
ubuntu
|
medium | CVE-2021-25633 medium priority: Ubuntu including 1 source packages (libreoffice), 8 status rows across 8 suites (bionic, focal, hirsute, impish, jammy, trusty, upstream, xenial): ignored 3, not-affected 3, released 2. | https://ubuntu.com/security/CVE-2021-25633 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| libreoffice | libreoffice | >= 7.0.0, < 7.0.6 | cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:* |
| libreoffice | libreoffice | >= 7.1.0, < 7.1.2 | cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:* |
| debian | debian_linux | 11.0 | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://www.debian.org/security/2021/dsa-4988 | Third Party Advisory |
| https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25633 | Vendor Advisory |