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Vulnerability record · CVE-2015-1798 · published 8 April 2015

CVE-2015-1798: Ntp vulnerability

Ntp · Ntp

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.

1.8 CVSS 2.0 Low EPSS 2.2% · top 17.4% CWE-17 · CWE-17
1.8CVSS 2.0 base score
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
42References
17 Jun 2026Last modified by NVD

Description

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://bugs.ntp.org/show_bug.cgi?id=2779
http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155863.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155864.html
http://lists.opensuse.org/opensuse-updates/2015-04/msg00052.html
http://marc.info/?l=bugtraq&m=143213867103400&w=2
http://rhn.redhat.com/errata/RHSA-2015-1459.html
http://support.apple.com/kb/HT204942
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities Vendor Advisory
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150408-ntpd
http://tools.cisco.com/security/center/viewAlert.x?alertId=38276
http://www.debian.org/security/2015/dsa-3223
http://www.kb.cert.org/vuls/id/374268 Third Party AdvisoryUS Government Resource
http://www.mandriva.com/security/advisories?name=MDVSA-2015:202
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/73951
http://www.securitytracker.com/id/1032032
http://www.ubuntu.com/usn/USN-2567-1
https://kc.mcafee.com/corporate/index?page=content&id=SB10114
https://security.gentoo.org/glsa/201509-01
http://bugs.ntp.org/show_bug.cgi?id=2779
http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155863.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155864.html
http://lists.opensuse.org/opensuse-updates/2015-04/msg00052.html
http://marc.info/?l=bugtraq&m=143213867103400&w=2
http://rhn.redhat.com/errata/RHSA-2015-1459.html
http://support.apple.com/kb/HT204942
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities Vendor Advisory
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150408-ntpd
http://tools.cisco.com/security/center/viewAlert.x?alertId=38276
http://www.debian.org/security/2015/dsa-3223
http://www.kb.cert.org/vuls/id/374268 Third Party AdvisoryUS Government Resource
http://www.mandriva.com/security/advisories?name=MDVSA-2015:202
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/73951
http://www.securitytracker.com/id/1032032
http://www.ubuntu.com/usn/USN-2567-1

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-12327Ntp out-of-bounds write vulnerabilityStack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher privileges v…EPSS 28%9.8CVE-2018-7183Ntp out-of-bounds write vulnerabilityBuffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute arbitrary code by leveraging an …EPSS 10%9.8CVE-2015-7853Ntp classic buffer overflow vulnerabilityThe 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 arbitrary code o…EPSS 12%9.8CVE-2015-7871ntpd Crypto-NAK packets bypass authenticationntpd in NTP 4.2.x before 4.2.8p4 and 4.3.x before 4.3.77 mishandles Crypto-NAK packets, allowing remote attackers to bypass authentication. Because N…EPSS 82%analysed9.8CVE-2015-7705Ntp improper input validation vulnerabilityThe rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified impact via a large number of …EPSS 12%8.8CVE-2015-7849Ntp use after free vulnerabilityUse-after-free vulnerability in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to possibly execute arbit…EPSS 17%8.8CVE-2015-7854Ntp classic buffer overflow vulnerabilityBuffer overflow in the password management functionality in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to ca…EPSS 15%8.8CVE-2017-6460Ntp memory buffer overflow vulnerabilityStack-based buffer overflow in the reslist function in ntpq in NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows remote servers have unspecified imp…EPSS 2.7%

Source: NIST National Vulnerability Database (record CVE-2015-1798), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.