CVE-2018-8956
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.
Does this matter?
Lower severity and a low EPSS score (3.14%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 3.14% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- ntp/ntp
- Source
- cve@mitre.org
EPSS 3.1% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html
- http://www.ntp.org/Vendor Advisory
- https://arxiv.org/abs/2005.01783Third Party Advisory
- https://nikhiltripathi.in/NTP_attack.pdfThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200518-0006/
- https://tools.ietf.org/html/rfc5905Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html
- http://www.ntp.org/Vendor Advisory
- https://arxiv.org/abs/2005.01783Third Party Advisory
- https://nikhiltripathi.in/NTP_attack.pdfThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200518-0006/
- https://tools.ietf.org/html/rfc5905Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.