Read the docs
TI-2015-06626 Aliases CVE-2015-7974GHSA-26v6-r4x8-vv44

NTP 4.x before 4.2.8p6 and 4.3.x before 4.3.90 do not verify peer associations of…

Priority MEDIUM 42CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 8 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-287.

Summary

NTP 4.x before 4.2.8p6 and 4.3.x before 4.3.90 do not verify peer associations of symmetric keys when authenticating packets, which might allow remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a "skeleton key."

Why it matters now

EPSS 0.05658 93rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 1 advisoryRed Hat: 8 fixed, 2 without a fix

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 · 28

CPEVersionsRoleVendor
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*4.2.0 to before 4.2.8; 4.3.0 to before 4.3.90VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:*4.2.8VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*4.2.8 p1VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:*4.2.8 p1-beta1VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta2:*:*:*:*:*:*4.2.8 p1-beta2VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta3:*:*:*:*:*:*4.2.8 p1-beta3VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta4:*:*:*:*:*:*4.2.8 p1-beta4VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta5:*:*:*:*:*:*4.2.8 p1-beta5VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p1-rc1:*:*:*:*:*:*4.2.8 p1-rc1VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p1-rc2:*:*:*:*:*:*4.2.8 p1-rc2VulnerableNTP Project
  • cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:* Versions 4.2.0 to before 4.2.8; 4.3.0 to before 4.3.90 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:* Versions 4.2.8 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:* Versions 4.2.8 p1 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:* Versions 4.2.8 p1-beta1 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p1-beta2:*:*:*:*:*:* Versions 4.2.8 p1-beta2 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p1-beta3:*:*:*:*:*:* Versions 4.2.8 p1-beta3 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p1-beta4:*:*:*:*:*:* Versions 4.2.8 p1-beta4 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p1-beta5:*:*:*:*:*:* Versions 4.2.8 p1-beta5 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p1-rc1:*:*:*:*:*:* Versions 4.2.8 p1-rc1 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p1-rc2:*:*:*:*:*:* Versions 4.2.8 p1-rc2 Vulnerable ·NTP Project
Show 18 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:*4.2.8 p2VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:*4.2.8 p2-rc1VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p2-rc2:*:*:*:*:*:*4.2.8 p2-rc2VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p2-rc3:*:*:*:*:*:*4.2.8 p2-rc3VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:*4.2.8 p3VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p3-rc1:*:*:*:*:*:*4.2.8 p3-rc1VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p3-rc2:*:*:*:*:*:*4.2.8 p3-rc2VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p3-rc3:*:*:*:*:*:*4.2.8 p3-rc3VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:*4.2.8 p4VulnerableNTP Project
cpe:2.3:a:ntp:ntp:4.2.8:p5:*:*:*:*:*:*4.2.8 p5VulnerableNTP Project
cpe:2.3:o:siemens:tim_4r-ie_firmware:*:*:*:*:*:*:*:*all versionsVulnerableSiemens
cpe:2.3:h:siemens:tim_4r-ie:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:tim_4r-ie_dnp3_firmware:*:*:*:*:*:*:*:*all versionsVulnerableSiemens
cpe:2.3:h:siemens:tim_4r-ie_dnp3:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:oncommand_balance:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:* Versions 4.2.8 p2 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:* Versions 4.2.8 p2-rc1 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p2-rc2:*:*:*:*:*:* Versions 4.2.8 p2-rc2 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p2-rc3:*:*:*:*:*:* Versions 4.2.8 p2-rc3 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:* Versions 4.2.8 p3 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p3-rc1:*:*:*:*:*:* Versions 4.2.8 p3-rc1 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p3-rc2:*:*:*:*:*:* Versions 4.2.8 p3-rc2 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p3-rc3:*:*:*:*:*:* Versions 4.2.8 p3-rc3 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:* Versions 4.2.8 p4 Vulnerable ·NTP Project
  • cpe:2.3:a:ntp:ntp:4.2.8:p5:*:*:*:*:*:* Versions 4.2.8 p5 Vulnerable ·NTP Project
  • cpe:2.3:o:siemens:tim_4r-ie_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
  • cpe:2.3:h:siemens:tim_4r-ie:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:tim_4r-ie_dnp3_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
  • cpe:2.3:h:siemens:tim_4r-ie_dnp3:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:oncommand_balance:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

Red Hat 1 advisory

  • RHSA-2016:2583 Released 2016-11-03 · Red Hat rating Moderate
    ntp security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) ntp-4.2.6p5-25.el7, ntpdate-4.2.6p5-25.el7
    • Red Hat Enterprise Linux Client Optional (v. 7) ntp-doc-4.2.6p5-25.el7, ntp-perl-4.2.6p5-25.el7, sntp-4.2.6p5-25.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) ntp-4.2.6p5-25.el7, ntpdate-4.2.6p5-25.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) ntp-doc-4.2.6p5-25.el7, ntp-perl-4.2.6p5-25.el7, sntp-4.2.6p5-25.el7
    • Red Hat Enterprise Linux Server (v. 7) ntp-4.2.6p5-25.el7, ntpdate-4.2.6p5-25.el7
    • Red Hat Enterprise Linux Server Optional (v. 7) ntp-doc-4.2.6p5-25.el7, ntp-perl-4.2.6p5-25.el7, sntp-4.2.6p5-25.el7
    • Red Hat Enterprise Linux Workstation (v. 7) ntp-4.2.6p5-25.el7, ntpdate-4.2.6p5-25.el7
    • Red Hat Enterprise Linux Workstation Optional (v. 7) ntp-doc-4.2.6p5-25.el7, ntp-perl-4.2.6p5-25.el7, sntp-4.2.6p5-25.el7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2016:2583
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2016:2583
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2016:2583
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2016:2583
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2016:2583
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2016:2583
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2016:2583
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2016:2583

Timeline

  1. 2026-10-02 Threatist record created from CVE-2015-7974
  2. 2026-10-03 Alias added: GHSA-26v6-r4x8-vv44

References

Exploit 1

Advisory 11

Sources

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