ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (ephemeral-association demobilization) by sending a spoofed crypto-NAK packet with incorrect authentication data at a certain time.
結論預警: CVE-2016-4953 綜合評估為高風險（68.4/100）：CVSS 技術影響為高級，利用機率偏高（EPSS 17.24%，百分位 97%） 核心證據: EPSS 顯示該漏洞近期被利用的可能性處於高位。 近一日 EPSS 上升 +4.53%，被利用關注度持續升高。 強制指令: 被利用機率偏高—請盤點暴露面並優先安排修補。
風險隨態勢動態變化；本站持續評估並同步更新本頁展示內容。
EPSS 日更估計相對被利用可能性；百分位表示該 CVE 在已評分漏洞中的相對排名（越高表示相對更嚴重）。
| # | 日期 | 舊 EPSS 分數 | 新 EPSS 分數 | 變化（新 − 舊） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 12.72% | 17.24% | +4.53% |
| 2 | 2026-06-03 | 13.62% | 12.72% | -0.90% |
| 3 | 2026-05-03 | — | 13.62% | — |
完整 EPSS 歷史 （共 26 筆）
該 CVE 的 CVSS 指標。
| 底座分 | 版本 | 嚴重度 | 向量 | 可利用性 | 影響 | 分數來源 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2016-4953 not yet assigned priority: Debian including 1 source packages (ntp), 1 status rows across 1 suites (bullseye): resolved 1. | https://security-tracker.debian.org/tracker/CVE-2016-4953 |
gentoo
|
normal | CVE-2016-4953: 1 GLSA(s) (201607-15), 1 atom(s) (net-misc/ntp); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-4953 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2016-4953 |
suse
|
low | CVE-2016-4953 severity low: SUSE including 20 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-2016-4953/ |
ubuntu
|
medium | CVE-2016-4953 medium priority: Ubuntu including 1 source packages (ntp), 5 status rows across 5 suites (precise, trusty, upstream, wily, xenial): not-affected 3, ignored 1, needs-triage 1. | https://ubuntu.com/security/CVE-2016-4953 |
| 廠商 | 產品 | 版本 | 原始 CPE |
|---|---|---|---|
| ntp | ntp | >= 4.2.0, < 4.2.8 | cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:* |
| ntp | ntp | >= 4.3.0, < 4.3.93 | cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p1-beta2:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p1-beta3:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p1-beta4:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p1-beta5:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p1-rc1:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p1-rc2:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p2-rc2:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p2-rc3:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p3-rc1:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p3-rc2:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p3-rc3:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p5:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p6:*:*:*:*:*:* |
| ntp | ntp | 4.2.8 | cpe:2.3:a:ntp:ntp:4.2.8:p7:*:*:*:*:*:* |
| oracle | solaris | 10 | cpe:2.3:o:oracle:solaris:10:*:*:*:*:*:*:* |
| oracle | solaris | 11.3 | cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:* |
| suse | manager | 2.1 | cpe:2.3:a:suse:manager:2.1:*:*:*:*:*:*:* |
| suse | manager_proxy | 2.1 | cpe:2.3:a:suse:manager_proxy:2.1:*:*:*:*:*:*:* |
| suse | openstack_cloud | 5 | cpe:2.3:a:suse:openstack_cloud:5:*:*:*:*:*:*:* |
| opensuse | leap | 42.1 | cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:* |
| opensuse | opensuse | 13.2 | cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:* |
| suse | linux_enterprise_desktop | 12 | cpe:2.3:o:suse:linux_enterprise_desktop:12:sp1:*:*:*:*:*:* |
| suse | linux_enterprise_server | 11 | cpe:2.3:o:suse:linux_enterprise_server:11:sp2:*:*:ltss:*:*:* |
| suse | linux_enterprise_server | 11 | cpe:2.3:o:suse:linux_enterprise_server:11:sp3:*:*:ltss:*:*:* |
| suse | linux_enterprise_server | 11 | cpe:2.3:o:suse:linux_enterprise_server:11:sp4:*:*:*:*:*:* |
| suse | linux_enterprise_server | 12 | cpe:2.3:o:suse:linux_enterprise_server:12:sp1:*:*:*:*:*:* |
| siemens | simatic_net_cp_443-1_opc_ua_firmware | — | cpe:2.3:o:siemens:simatic_net_cp_443-1_opc_ua_firmware:*:*:*:*:*:*:*:* |
| siemens | tim_4r-ie_firmware | — | cpe:2.3:o:siemens:tim_4r-ie_firmware:*:*:*:*:*:*:*:* |
| siemens | tim_4r-ie_dnp3_firmware | — | cpe:2.3:o:siemens:tim_4r-ie_dnp3_firmware:*:*:*:*:*:*:*:* |