ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a…
Priority LOW 30CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via soofed mode 3 and mode 5 packets. The attacker must either be a part of the same broadcast network or control a slave in that broadcast network that can capture certain required packets on the attacker's behalf and send them to the attacker.
Why it matters now
EPSS 0.03144 87th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ntp:ntp:4.2.8:p10:*:*:*:*:*:* | 4.2.8 p10 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p11:*:*:*:*:*:* | 4.2.8 p11 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p12:*:*:*:*:*:* | 4.2.8 p12 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p13:*:*:*:*:*:* | 4.2.8 p13 | Vulnerable | NTP Project |
- cpe:2.3:a:ntp:ntp:4.2.8:p10:*:*:*:*:*:* Versions 4.2.8 p10 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p11:*:*:*:*:*:* Versions 4.2.8 p11 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p12:*:*:*:*:*:* Versions 4.2.8 p12 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p13:*:*:*:*:*:* Versions 4.2.8 p13 Vulnerable ·NTP Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2018-8956
- 2026-10-03 Alias added: GHSA-gg7p-jc5w-p68m
References
More NTP Project Ntp vulnerabilities
- TI-2015-06541 Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows… CVSS 3.1CRITICAL 9.8
- TI-2014-07543 Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers… CVSS 2.0HIGH 7.5
- TI-2013-04524 The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote… CVSS 2.0MEDIUM 5.0
- TI-2016-06333 The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a… CVSS 3.1HIGH 7.5
- TI-2018-08842 Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker… CVSS 3.0CRITICAL 9.8
- TI-2016-04280 ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon… CVSS 3.1HIGH 7.5
Sources
- CVE-2018-8956 · CVE Program
- CVE-2018-8956 · NVD
- FIRST EPSS
- GHSA-gg7p-jc5w-p68m · GitHub Advisory Database · CC BY 4.0
- CVE-2018-8956 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences