Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, and Firefox ESR < 128.1.
総合評価: CVE-2024-7531 は低リスク（37.7/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.41%、32 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 | 0.05% | 0.41% | +0.36% |
| 2 | 2025-11-21 | 0.24% | 0.05% | -0.19% |
| 3 | 2025-11-18 | — | 0.24% | — |
EPSS の全履歴 （全 8 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 |
|
2.8 | 3.6 | [email protected] |
| 6.3 | 3.1 | MEDIUM |
|
2.8 | 3.4 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2024-7531: 2 source package rows (firefox, firefox-esr); 261 state rows across 3 repos (3.20-community, 3.22-community, edge-community); fixed 0, open 261. | https://security.alpinelinux.org/vuln/CVE-2024-7531 |
debian
|
unimportant | CVE-2024-7531 unimportant priority: Debian including 3 source packages (firefox, firefox-esr, nss), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10, open 1. | https://security-tracker.debian.org/tracker/CVE-2024-7531 |
gentoo
|
high | CVE-2024-7531: 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-2024-7531 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2024-7531 |
suse
|
high | CVE-2024-7531 severity important: SUSE including 25 source package names (MozillaFirefox-128.1.0-112.221.1, MozillaFirefox-128.1.0-150200.152.146.1, …), 155 product×package rows across 44 product lines (Container suse/kiosk/firefox-esr, Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, … (44 product lines)): Fixed 155. | https://www.suse.com/security/cve/CVE-2024-7531/ |
ubuntu
|
medium | CVE-2024-7531 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-2024-7531 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| mozilla | firefox | < 129.0 | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
| mozilla | firefox_esr | < 115.14.0 | cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* |
| mozilla | firefox_esr | 128.0 | cpe:2.3:a:mozilla:firefox_esr:128.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1905691 | Issue Tracking Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2024-33/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2024-34/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2024-35/ | Vendor Advisory |