THREATPORT/VULNERABILITY/CVE-2015-7855
MEDIUM SEVERITY

CVE-2015-7855

Ntp vulnerability

CVSS
6.5
EPSS
31.1%
EPSS pct
98th
Exploited
No known
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.
Affected vendor
Ntp
Affected product
Ntp
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-20 — Improper Input Validation
Published
2017-08-07

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 31.1% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2015-7855

  • Confirm whether Ntp Ntp is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2015-7855.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2015-7855

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2015-7855 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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