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CVE-2015-5195· NVD / CVE Program· CNA redhat

ntp_openssl.m4 in ntpd in NTP before 4.2.7p112 allows remote attackers to cause a denial of service (segmentation fault) via a crafted stati

ntp_openssl.m4 in ntpd in NTP before 4.2.7p112 allows remote attackers to cause a denial of service (segmentation fault) via a crafted statistics or filegen configuration command that is not enabled during compilation.

HighCVSS 7.5 · v3.0—Proof of concept Fix available
Published
Jul 21, 2017
Updated
Jun 16, 2026
EPSS
7.5% · 94th percentile
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Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 7.5%

Affected systems

VendorProduct
ntpntp
fedoraprojectfedora
redhatenterprise linux desktop
redhatenterprise linux hpc node
redhatenterprise linux server
redhatenterprise linux workstation
debiandebian linux
canonicalubuntu linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux12.04
  • canonical ubuntu linux14.04
  • canonical ubuntu linux15.04
  • canonical ubuntu linux15.10
  • debian debian linux7.0
  • debian debian linux8.0
  • fedoraproject fedora21
  • fedoraproject fedora22
  • fedoraproject fedora23
  • ntp ntpup to 4.2.7 inclusive
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux hpc node6.0
  • redhat enterprise linux hpc node7.0
  • redhat enterprise linux server6.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux workstation6.0
  • redhat enterprise linux workstation7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:11ntpbefore 1:4.2.8p3+dfsg-11:4.2.8p3+dfsg-1
Debian:6.0ntpbefore 1:4.2.6.p2+dfsg-1+deb6u41:4.2.6.p2+dfsg-1+deb6u4
Debian:7ntpbefore 1:4.2.6.p5+dfsg-2+deb7u61:4.2.6.p5+dfsg-2+deb7u6
Debian:8ntpbefore 1:4.2.6.p5+dfsg-7+deb8u11:4.2.6.p5+dfsg-7+deb8u1
Red Hat:enterprise_linux:6::clientntpbefore 0:4.2.6p5-10.el60:4.2.6p5-10.el6
Red Hat:enterprise_linux:6::clientntp-debuginfobefore 0:4.2.6p5-10.el60:4.2.6p5-10.el6
Red Hat:enterprise_linux:6::clientntp-docbefore 0:4.2.6p5-10.el60:4.2.6p5-10.el6
Red Hat:enterprise_linux:6::clientntp-perlbefore 0:4.2.6p5-10.el60:4.2.6p5-10.el6
Red Hat:enterprise_linux:6::clientntpdatebefore 0:4.2.6p5-10.el60:4.2.6p5-10.el6
Red Hat:enterprise_linux:7::clientntpbefore 0:4.2.6p5-25.el70:4.2.6p5-25.el7
Red Hat:enterprise_linux:7::clientntp-debuginfobefore 0:4.2.6p5-25.el70:4.2.6p5-25.el7
Red Hat:enterprise_linux:7::clientntp-docbefore 0:4.2.6p5-25.el70:4.2.6p5-25.el7
Red Hat:enterprise_linux:7::clientntp-perlbefore 0:4.2.6p5-25.el70:4.2.6p5-25.el7
Red Hat:enterprise_linux:7::clientntpdatebefore 0:4.2.6p5-25.el70:4.2.6p5-25.el7
Red Hat:enterprise_linux:7::clientsntpbefore 0:4.2.6p5-25.el70:4.2.6p5-25.el7

Same product

ntp: all records

Other highest-scoring records for the same primary product.

  • CVE-2015-7871Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.
    64This week
  • CVE-2014-9295Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers to execute arbitrary code via a crafted packet, rel
    54Plan
  • CVE-2013-5211The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service (traffic amplificat
    49Plan
  • CVE-2018-12327Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher pri
    47Plan
  • CVE-2016-7434The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a crafted mrulist query.
    46Plan
  • CVE-2015-7853The datalen parameter in the refclock driver in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to execute arbitra
    43Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:ntp1:4.2.8p3+dfsg-1 · Debian:11Package registry (OSV)
red hat:ntp0:4.2.6p5-10.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:ntp-debuginfo0:4.2.6p5-10.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:ntp-doc0:4.2.6p5-10.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:ntp-perl0:4.2.6p5-10.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:ntpdate0:4.2.6p5-10.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:sntp0:4.2.6p5-25.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02017-03-04

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-139 d
  2. Published
  3. TodaySep 30, 2026+3358 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records