A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.
総合評価: CVE-2025-4087 は低リスク（38/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.30%、54 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 | 2026-06-07 | 0.44% | 0.30% | -0.13% |
| 2 | 2026-02-23 | 0.05% | 0.44% | +0.39% |
| 3 | 2025-10-07 | — | 0.05% | — |
EPSS の全履歴 （全 6 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 |
|---|---|---|---|---|---|---|
| 4.8 | 3.1 | MEDIUM |
|
2.2 | 2.5 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2025-4087: 3 source package rows (firefox, firefox-esr, thunderbird); 353 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 353. | https://security.alpinelinux.org/vuln/CVE-2025-4087 |
debian
|
not yet assigned | CVE-2025-4087 not yet assigned priority: Debian including 3 source packages (firefox, firefox-esr, thunderbird), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 11. | https://security-tracker.debian.org/tracker/CVE-2025-4087 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-4087 |
suse
|
high | CVE-2025-4087 severity important: SUSE including 23 source package names (MozillaFirefox-128.10.0-150200.152.179.1, MozillaFirefox-138.0-1.1, …), 105 product×package rows across 38 product lines (Container suse/kiosk/firefox-esr, Image SLES15-SP3-SAP-Azure-LI-BYOS-Production, … (38 product lines)): Fixed 105. | https://www.suse.com/security/cve/CVE-2025-4087/ |
ubuntu
|
medium | CVE-2025-4087 medium priority: Ubuntu including 9 source packages (firefox, mozjs102, …), 65 status rows across 8 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream): DNE 35, ignored 10, not-affected 9, needs-triage 8, released 3. | https://ubuntu.com/security/CVE-2025-4087 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| mozilla | firefox | < 128.10 | cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* |
| mozilla | firefox | < 138.0 | cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* |
| mozilla | thunderbird | < 128.10.0 | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* |
| mozilla | thunderbird | < 138.0 | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* |
| URL | タグ |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1952465 | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2025-28/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-29/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-31/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-32/ | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html |