NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic.
総合評価: CVE-2024-8508 は低リスク（39.9/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.81%、52 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 | 0.23% | 0.81% | +0.58% |
| 2 | 2025-11-21 | 0.85% | 0.23% | -0.62% |
| 3 | 2025-11-18 | — | 0.85% | — |
EPSS の全履歴 （全 31 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 |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
3.9 | 1.4 | [email protected] |
| 5.3 | 3.1 | MEDIUM |
|
3.9 | 1.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2024-8508: 1 source package rows (unbound); 51 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 9, open 42. | https://security.alpinelinux.org/vuln/CVE-2024-8508 |
debian
|
not yet assigned | CVE-2024-8508 not yet assigned priority: Debian including 1 source packages (unbound), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2024-8508 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2024-8508 |
suse
|
medium | CVE-2024-8508 severity moderate: SUSE including 39 source package names (libssh-config-0.10.6-slfo.1.1_2.1, libssh4-0.10.6-slfo.1.1_2.1, …), 104 product×package rows across 39 product lines (Image SL-Micro, Image SL-Micro-Base, … (39 product lines)): Fixed 104. | https://www.suse.com/security/cve/CVE-2024-8508/ |
ubuntu
|
medium | CVE-2024-8508 medium priority: Ubuntu including 1 source packages (unbound), 8 status rows across 8 suites (bionic, focal, jammy, noble, oracular, trusty, upstream, xenial): released 8. | https://ubuntu.com/security/CVE-2024-8508 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| nlnetlabs | unbound | < 1.21.1 | cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* |
| debian | debian_linux | 11.0 | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt | Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2024/10/04/5 | Mailing List Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2024/11/msg00009.html | Mailing List Third Party Advisory |