ntpd in NTP 4.2.8p3 and NTPsec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 relies on the underlying operating system to protect it from requests that impersonate reference clocks. Because reference clocks are treated like other peers and stored in the same structure, any packet with a source ip address of a reference clock (127.127.1.1 for example) that reaches the receive() function will match that reference clock's peer record and will be treated as a trusted peer. Any system that lacks the typical martian packet filtering which would block these packets is in danger of having its time controlled by an attacker.
総合評価: CVE-2016-1551 は中リスク（44.2/100）。CVSS 深刻度は低。悪用される可能性が高い（EPSS 2.23%、80 パーセンタイル） 根拠: 直近 1 日で EPSS が +1.26% 上昇。悪用への関心が高まっている可能性があります。 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 | 0.98% | 2.23% | +1.26% |
| 2 | 2025-12-28 | 0.73% | 0.98% | +0.24% |
| 3 | 2025-12-27 | — | 0.73% | — |
EPSS の全履歴 （全 12 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 |
|---|---|---|---|---|---|---|
| 3.7 | 3.0 | LOW |
|
2.2 | 1.4 | [email protected] |
| 2.6 | 2.0 | LOW |
|
4.9 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2016-1551 unimportant priority: Debian including 1 source packages (ntp), 1 status rows across 1 suites (bullseye): resolved 1. | https://security-tracker.debian.org/tracker/CVE-2016-1551 |
gentoo
|
normal | CVE-2016-1551: 1 GLSA(s) (201607-15), 1 atom(s) (net-misc/ntp); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-1551 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2016-1551 |
suse
|
low | CVE-2016-1551 severity low: SUSE including 22 source package names (ntp-4.2.8p10-63.3, ntp-4.2.8p11-2.12, …), 80 product×package rows across 54 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-Basic-On-Demand, … (54 product lines)): Fixed 80. | https://www.suse.com/security/cve/CVE-2016-1551/ |
ubuntu
|
negligible | CVE-2016-1551 negligible priority: Ubuntu including 1 source packages (ntp), 5 status rows across 5 suites (precise, trusty, upstream, wily, xenial): not-affected 4, released 1. | https://ubuntu.com/security/CVE-2016-1551 |