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CVE-2016-9042

17
FAUCET Score

CVE-2016-9042 is an exploitable denial-of-service vulnerability in the Network Time Protocol daemon (ntpd) version 4.2.8p9, affecting products from vendors like FreeBSD, HPE, NTP, and Siemens. An unauthenticated attacker can send a specially crafted network packet to reset the expected origin timestamp for target peers. This causes legitimate replies to be dropped, leading to a denial-of-service condition with a CVSS score of 5.9 (Medium). There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p9:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:10.0:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:11.0:*:*:*:*:*:*:*
< c.4.2.8.4.0CPE matchmatch criteria
cpe:2.3:a:hpe:hpux-ntp:*:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:siemens:simatic_net_cp_443-1_opc_ua_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

3.7LOW

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
2.2
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.96%
Probability of exploitation in next 30 days
EPSS Percentile
89.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0396 is in the 86th percentile among its peer group of 19,955 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2016-9042Moderate

ntp: DoS via origin timestamp check functionality

Mar 21, 2017

References

packetstormsecurity.com / files/142101/FreeBSD-Security-Advisory-FreeBSD-SA-17-03.ntp.html
packetstormsecurity.com / files/142284/Slackware-Security-Advisory-ntp-Updates.html
bto.bluecoat.com / security-advisory/sa147
cert-portal.siemens.com / productcert/pdf/ssa-211752.pdf
Third Party Advisory
seclists.org / fulldisclosure/2017/Nov/7
seclists.org / fulldisclosure/2017/Sep/62
kc.mcafee.com / corporate/index
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/7KVLFA3J43QFIP4I7HE7KQ5FXSMJEKC6
security.freebsd.org / advisories/FreeBSD-SA-17:03.ntp.asc
Third Party Advisory
support.apple.com / kb/HT208144
support.f5.com / csp/article/K39041624
support.hpe.com / hpsc/doc/public/display
Third Party Advisory
us-cert.cisa.gov / ics/advisories/icsa-21-159-11
talosintelligence.com / vulnerability_reports/TALOS-2016-0260
ExploitMitigationThird Party Advisory
securityfocus.com / archive/1/540403/100/0/threaded
securityfocus.com / archive/1/archive/1/540403/100/0/threaded
securityfocus.com / archive/1/archive/1/540464/100/0/threaded
securityfocus.com / bid/97046
Permissions RequiredThird Party AdvisoryVDB Entry
securitytracker.com / id/1038123
Third Party AdvisoryVDB Entry
securitytracker.com / id/1039427
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-3349-1