Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
総合評価: CVE-2025-0243 は低リスク（23.2/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.03%、8 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 | 2026-02-15 | 0.06% | 0.03% | -0.03% |
| 2 | 2025-09-21 | 0.05% | 0.06% | +0.01% |
| 3 | 2025-09-18 | — | 0.05% | — |
EPSS の全履歴 （全 5 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 |
|---|---|---|---|---|---|---|
| 5.1 | 3.1 | MEDIUM |
|
2.5 | 2.5 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2025-0243: 3 source package rows (firefox, firefox-esr, thunderbird); 335 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 335. | https://security.alpinelinux.org/vuln/CVE-2025-0243 |
debian
|
not yet assigned | CVE-2025-0243 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-2025-0243 |
gentoo
|
high | CVE-2025-0243: 3 GLSA(s) (202501-10, 202505-03, 202509-02), 5 atom(s) (dev-lang/spidermonkey, mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2025-0243 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-0243 |
suse
|
high | CVE-2025-0243 severity important: SUSE including 40 source package names (MozillaFirefox-128.6.0-112.243.1, MozillaFirefox-128.6.0-150200.152.167.1, …), 145 product×package rows across 49 product lines (Container suse/kiosk/firefox-esr, Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, … (49 product lines)): Fixed 145. | https://www.suse.com/security/cve/CVE-2025-0243/ |
ubuntu
|
medium | CVE-2025-0243 medium priority: Ubuntu including 9 source packages (firefox, mozjs102, …), 65 status rows across 8 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream): DNE 34, ignored 10, needs-triage 10, not-affected 9, released 2. | https://ubuntu.com/security/CVE-2025-0243 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| mozilla | firefox | < 128.6.0 | cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* |
| mozilla | firefox | < 133.0 | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
| mozilla | thunderbird | < 128.6.0 | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* |
| mozilla | thunderbird | >= 129.0, < 134.0 | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://bugzilla.mozilla.org/buglist.cgi?bug_id=1827142%2C1932783 | Broken Link Issue Tracking |
| https://www.mozilla.org/security/advisories/mfsa2025-01/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-02/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-04/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-05/ | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html |