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CVE-2015-1798

11
FAUCET Score

CVE-2015-1798 describes a vulnerability in NTP 4.x before 4.2.8p2, specifically within the ntp_proto.c receive function. This flaw allows man-in-the-middle attackers to spoof NTP packets by omitting the Message Authentication Code (MAC), as the symmetric-key feature only enforces MAC validation if the MAC field has a non-zero length. With a CVSS score of 1.8, this vulnerability has a low severity, requiring adjacent network access and high attack complexity to achieve a partial integrity impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.7p444CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

1.8LOW

AV:A/AC:H/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
ADJACENT_NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
3.2
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.22%
Probability of exploitation in next 30 days
EPSS Percentile
80.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0222 is in the 98th percentile among its peer group of 122 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, 0.1 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-5.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-22.el7
View patch

Vendor Advisories (1)

redhatCVE-2015-1798Low

ntp: ntpd accepts unauthenticated packets with symmetric key crypto

Apr 7, 2015

References

bugs.ntp.org / show_bug.cgi
lists.apple.com / archives/security-announce/2015/Jun/msg00002.html
lists.fedoraproject.org / pipermail/package-announce/2015-April/155863.html
lists.fedoraproject.org / pipermail/package-announce/2015-April/155864.html
lists.opensuse.org / opensuse-updates/2015-04/msg00052.html
marc.info
rhn.redhat.com / errata/RHSA-2015-1459.html
kc.mcafee.com / corporate/index
security.gentoo.org / glsa/201509-01
support.apple.com / kb/HT204942
support.ntp.org / bin/view/Main/SecurityNotice
Vendor Advisory
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20150408-ntpd
tools.cisco.com / security/center/viewAlert.x
debian.org / security/2015/dsa-3223
kb.cert.org / vuls/id/374268
Third Party AdvisoryUS Government Resource
mandriva.com / security/advisories
oracle.com / technetwork/topics/security/bulletinapr2015-2511959.html
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
securityfocus.com / bid/73951
securitytracker.com / id/1032032
ubuntu.com / usn/USN-2567-1