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TI-2015-01615 Aliases CVE-2015-1798GHSA-cx2f-jc4r-m5vp

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x…

Priority LOW 14CWE-17Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · Partial · None
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

EPSS 0.02243 82nd percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*up to 4.2.7p444VulnerableNTP Project
  • cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:* Versions up to 4.2.7p444 Vulnerable ·NTP Project

Remediation

Red Hat 2 advisories

  • RHSA-2015:2231 Released 2015-11-19 · Red Hat rating Moderate
    ntp security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) ntp-4.2.6p5-22.el7, ntpdate-4.2.6p5-22.el7
    • Red Hat Enterprise Linux Client Optional (v. 7) ntp-doc-4.2.6p5-22.el7, ntp-perl-4.2.6p5-22.el7, sntp-4.2.6p5-22.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) ntp-4.2.6p5-22.el7, ntpdate-4.2.6p5-22.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) ntp-doc-4.2.6p5-22.el7, ntp-perl-4.2.6p5-22.el7, sntp-4.2.6p5-22.el7
    • Red Hat Enterprise Linux Server (v. 7) ntp-4.2.6p5-22.el7, ntpdate-4.2.6p5-22.el7
    • Red Hat Enterprise Linux Server Optional (v. 7) ntp-doc-4.2.6p5-22.el7, ntp-perl-4.2.6p5-22.el7, sntp-4.2.6p5-22.el7
    • Red Hat Enterprise Linux Workstation (v. 7) ntp-4.2.6p5-22.el7, ntpdate-4.2.6p5-22.el7
    • Red Hat Enterprise Linux Workstation Optional (v. 7) ntp-doc-4.2.6p5-22.el7, ntp-perl-4.2.6p5-22.el7, sntp-4.2.6p5-22.el7
  • RHSA-2015:1459 Released 2015-07-21 · Red Hat rating Moderate
    ntp security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Desktop (v. 6) ntp-4.2.6p5-5.el6, ntpdate-4.2.6p5-5.el6
    • Red Hat Enterprise Linux Desktop Optional (v. 6) ntp-doc-4.2.6p5-5.el6, ntp-perl-4.2.6p5-5.el6
    • Red Hat Enterprise Linux HPC Node (v. 6) ntp-4.2.6p5-5.el6, ntpdate-4.2.6p5-5.el6
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) ntp-doc-4.2.6p5-5.el6, ntp-perl-4.2.6p5-5.el6
    • Red Hat Enterprise Linux Server (v. 6) ntp-4.2.6p5-5.el6, ntpdate-4.2.6p5-5.el6
    • Red Hat Enterprise Linux Server Optional (v. 6) ntp-doc-4.2.6p5-5.el6, ntp-perl-4.2.6p5-5.el6
    • Red Hat Enterprise Linux Workstation (v. 6) ntp-4.2.6p5-5.el6, ntpdate-4.2.6p5-5.el6
    • Red Hat Enterprise Linux Workstation Optional (v. 6) ntp-doc-4.2.6p5-5.el6, ntp-perl-4.2.6p5-5.el6

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2015:2231
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2015:2231
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2015:2231
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2015:2231
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2015:1459
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2015:1459
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2015:1459
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2015:1459
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2015:1459
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2015:2231
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2015:1459
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2015:2231
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2015:1459
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2015:2231
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2015:1459
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2015:2231
Not affected: 1 product
  • Red Hat Enterprise Linux 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2015-1798
  2. 2026-10-03 Alias added: GHSA-cx2f-jc4r-m5vp

References

Advisory 14

Other 5

  • TI-2015-06541 Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows… CVSS 3.1CRITICAL 9.8
  • TI-2014-07543 Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers… CVSS 2.0HIGH 7.5
  • TI-2013-04524 The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote… CVSS 2.0MEDIUM 5.0
  • TI-2016-06333 The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a… CVSS 3.1HIGH 7.5
  • TI-2018-08842 Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker… CVSS 3.0CRITICAL 9.8
  • TI-2016-04280 ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon… CVSS 3.1HIGH 7.5
See all 98 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences