5.3

CVE-2016-2517: ntp Improper Input Validation

CVSS: 5.3v3.0MediumModified
AliasesUBUNTU-CVE-2016-2517DEBIAN-CVE-2016-2517
Published 30-01-2017Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2016-2517 is a medium (CVSS 5.3) Improper Input Validation vulnerability in ntp. EPSS estimates a 8.82% chance of exploitation in the next 30 days, higher than 95.1% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.0 (NVD)
EPSS score
8.82%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 5
OPENSUSE-SU-2024:10181-1SUSE-SU-2016:1278-1SUSE-SU-2016:1291-1SUSE-SU-2016:1471-1SUSE-SU-2016:1568-1

Timeline

  1. 30-01-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent subsequent authentication) by leveraging knowledge of the controlkey or requestkey and sending a crafted packet to ntpd, which changes the value of trustedkey, controlkey, or requestkey. NOTE: this vulnerability exists because of a CVE-2016-2516 regression.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

8.82%

Chance of exploitation in the next 30 days

Percentile

95%

Versus all other CVEs

30-day change

0.00 pp

From 8.82% on 18-09-2026

18-09-202618-10-2026
EPSS score
8.82%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • ntp< 1:4.2.8p7+dfsg-1
Ntp1 product
  • ntp≤ 4.2.8 | 4.3.0 | 4.3.1 | 4.3.2 | 4.3.3 | 4.3.4 | 4.3.5 | 4.3.6 | 4.3.7 | 4.3.8 | 4.3.9 | 4.3.10 | 4.3.11 | 4.3.12 | 4.3.13 | 4.3.14 | 4.3.15 | 4.3.16 | 4.3.17 | 4.3.18 | 4.3.19 | 4.3.20 | 4.3.21 | 4.3.22 | 4.3.23 | 4.3.24 | 4.3.25 | 4.3.26 | 4.3.27 | 4.3.28 | 4.3.29 | 4.3.30 | 4.3.31 | 4.3.32 | 4.3.33 | 4.3.34 | 4.3.35 | 4.3.36 | 4.3.37 | 4.3.38 | 4.3.39 | 4.3.40 | 4.3.41 | 4.3.42 | 4.3.43 | 4.3.44 | 4.3.45 | 4.3.46 | 4.3.47 | 4.3.48 | 4.3.49 | 4.3.50 | 4.3.51 | 4.3.52 | 4.3.53 | 4.3.54 | 4.3.55 | 4.3.56 | 4.3.57 | 4.3.58 | 4.3.59 | 4.3.60 | 4.3.61 | 4.3.62 | 4.3.63 | 4.3.64 | 4.3.65 | 4.3.66 | 4.3.67 | 4.3.68 | 4.3.69 | 4.3.70 | 4.3.71 | 4.3.72 | 4.3.73 | 4.3.74 | 4.3.75 | 4.3.76 | 4.3.77 | 4.3.78 | 4.3.79 | 4.3.80 | 4.3.81 | 4.3.82 | 4.3.83 | 4.3.84 | 4.3.85 | 4.3.86 | 4.3.87 | 4.3.88 | 4.3.89 | 4.3.90 | 4.3.91
Ubuntu1 product
  • ntpAll versions (No fix recorded)

3 vendors · 3 products

References

12 links
Show all 12 references