Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does not support. It did not ask before doing so for the Usenet-related schemes news: and snews:. Since most operating systems don't have a trusted newsreader installed by default, an unscrupulous program that the user downloaded could register itself as a handler. The website that served the application download could then launch that application at will. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Firefox ESR < 115.15.
総合評価: CVE-2024-8383 は中リスク（46.3/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.64%、46 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 | 0.25% | 0.64% | +0.39% |
| 2 | 2025-11-21 | 0.45% | 0.25% | -0.20% |
| 3 | 2025-11-18 | — | 0.45% | — |
EPSS の全履歴 （全 10 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] |
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2024-8383: 3 source package rows (firefox, firefox-esr, thunderbird); 265 state rows across 3 repos (3.20-community, 3.22-community, edge-community); fixed 0, open 265. | https://security.alpinelinux.org/vuln/CVE-2024-8383 |
debian
|
not yet assigned | CVE-2024-8383 not yet assigned priority: Debian including 3 source packages (firefox, firefox-esr, thunderbird), 8 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 8. | https://security-tracker.debian.org/tracker/CVE-2024-8383 |
gentoo
|
high | CVE-2024-8383: 3 GLSA(s) (202412-04, 202412-06, 202412-13), 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-2024-8383 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2024-8383 |
suse
|
high | CVE-2024-8383 severity important: SUSE including 31 source package names (MozillaFirefox-128.2.0-112.225.1, MozillaFirefox-128.2.0-150200.152.149.1, …), 124 product×package rows across 46 product lines (Container suse/kiosk/firefox-esr, Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, … (46 product lines)): Fixed 124. | https://www.suse.com/security/cve/CVE-2024-8383/ |
ubuntu
|
medium | CVE-2024-8383 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, needs-triage 11, not-affected 10, ignored 9, released 1. | https://ubuntu.com/security/CVE-2024-8383 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| mozilla | firefox | < 130.0 | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
| mozilla | firefox_esr | < 115.15 | cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* |
| mozilla | firefox_esr | >= 128.0, < 128.2 | cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1908496 | Issue Tracking Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2024-39/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2024-40/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2024-41/ | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2024/09/msg00012.html | |
| https://lists.debian.org/debian-lts-announce/2024/09/msg00025.html |