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Fencer Vulns
high 7.5

CVE-2020-11868 json

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode…

published 2020-04-17 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4208

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp.

Patch / fix

  • ntp ntp 4.3.100
  • ntp Debian 11 1:4.2.8p14+dfsg-1

debian advisories DEBIAN-CVE-2020-11868

  • ntp RHEL 7 4.2.6p5-29.el7_8.2
  • sntp RHEL 7 4.2.6p5-29.el7_8.2
  • ntpdate RHEL 7 4.2.6p5-29.el7_8.2
  • ntp-perl RHEL 7 4.2.6p5-29.el7_8.2

red hat advisories RHSA-2020:2663

  • ntp SLES for SAP 15, SLES 15-LTSS, SLE Module for Legacy 15 SP2 +1 more 4.2.8p15-4.10.1
  • ntp SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +12 more 4.2.8p15-88.1
  • ntp SLES 11 SP4-LTSS 4.2.8p15-64.16.1

suse advisories SUSE-SU-2020:1823-1SUSE-SU-2020:14415-1SUSE-SU-2020:1805-1

  • ntp openSUSE Tumbleweed 4.2.8p15-7.2
  • ntp openSUSE Leap 15.2 4.2.8p15-lp152.3.3.1
  • ntp openSUSE Leap 15.1 4.2.8p15-lp151.2.3.1

opensuse advisories openSUSE-SU-2024:11102-1openSUSE-SU-2020:1007-1openSUSE-SU-2020:0934-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-11868 updated cvss 3.7

ntp: DoS on client ntpd using server mode packet

  • Red Hat Enterprise Linux 5 ntp Red Hat Enterprise Linux 6 ntp, ntpdate, ntp-perl
    affected: workaround, no fix planned “Use authentication with symmetric keys.”
  • Red Hat Enterprise Linux Client (v. 7) ntp 4.2.6p5-29.el7_8.2, ntpdate 4.2.6p5-29.el7_8.2 Red Hat Enterprise Linux Client Optional (v. 7) sntp 4.2.6p5-29.el7_8.2, ntp-perl 4.2.6p5-29.el7_8.2 Red Hat Enterprise Linux ComputeNode (v. 7) ntp 4.2.6p5-29.el7_8.2, ntpdate 4.2.6p5-29.el7_8.2 Red Hat Enterprise Linux ComputeNode Optional (v. 7) sntp 4.2.6p5-29.el7_8.2, ntp-perl 4.2.6p5-29.el7_8.2 Red Hat Enterprise Linux Server (v. 7) ntp 4.2.6p5-29.el7_8.2, ntpdate 4.2.6p5-29.el7_8.2 Red Hat Enterprise Linux Server Optional (v. 7) sntp 4.2.6p5-29.el7_8.2, ntp-perl 4.2.6p5-29.el7_8.2
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) ntp 4.2.6p5-29.el7_8.2, ntpdate 4.2.6p5-29.el7_8.2 Red Hat Enterprise Linux Workstation Optional (v. 7) sntp 4.2.6p5-29.el7_8.2, ntp-perl 4.2.6p5-29.el7_8.2
    fixed: vendor fix “Use authentication with symmetric keys.” RHSA-2020:2663

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-234-01 updated cvss 7.5

Hitachi Energy AFF66x

  • Hitachi Energy AFF660/665 <= 03.0.02
    affected: vendor fix, mitigation “Hitachi Energy recommends the following actions:” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

2.12% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.9 CVSS:3.0/AC:H/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.