Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).

CVE-2015-7855 — Improper Input Validation in NTP

CWE-20 — Improper Input ValidationCWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-22 — Path TraversalCWE-264CWE-287 — Improper AuthenticationCWE-39931 documents11 sources
Severity
6.5MEDIUMNVD
OSV5.3
EPSS
60.1%
top 1.72%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
4
NTPDebian NTPDebian Linux+1 more
Timeline
PublishedAug 7
Latest updateMay 13

Description

The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages5 packages

▶NVDntp/ntp4.2.0 — 4.2.8+2
▶debiandebian/ntp< ntp 1:4.2.8p4+dfsg-1 (bullseye)
▶Debianntp/ntp< 1:4.2.8p4+dfsg-1
▶Ubuntuntp/ntp< 1:4.2.6.p5+dfsg-3ubuntu2.14.04.5

Also affects: Debian Linux 7.0, 8.0, 9.0

Patches

Patch: support.ntp.org ↗Patch: support.ntp.org ↗

🔴Vulnerability Details

3
GHSA
GHSA-wmrv-mc39-vj78: The decodenetnum function in ntpd in NTP 4↗2022-05-13
▶
OSV
CVE-2015-7855: The decodenetnum function in ntpd in NTP 4↗2017-08-07
▶
OSV
ntp vulnerabilities↗2015-10-27
▶

💥Exploits & PoCs

1
Exploit-DB
NTP 4.2.8p3 - Denial of Service↗2016-11-28
▶

📋Vendor Advisories

24
CISA ICS
Siemens TIM 4R-IE Devices↗2021-04-13
▶
CISA ICS
Siemens RUGGEDCOM ROX-based Devices NTP Vulnerabilities↗2018-08-27
▶
CISA ICS
Rockwell Automation Stratix 5900↗2017-05-10
▶
Ubuntu
NTP vulnerabilities↗2015-10-27
▶
BSD
FreeBSD-SA-15:25.ntp: Multiple vulnerabilities of ntp [REVISED]↗2015-10-26
▶

💬Community

2
Bugzilla
CVE-2015-7855 ntp: ASSERT in decodenetnum() on invalid values [fedora-all]↗2016-01-06
▶
Bugzilla
CVE-2015-7855 ntp: ASSERT in decodenetnum() on invalid values↗2015-10-22
▶