CVE-2015-7974
No exploitation reported by the sources we read.
- Published2016-01-26
- Fixed in4.3.90 · 4.2.8
- WeaknessCWE-287
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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."
Timeline
dates in UTC- 2016-01-2619:59CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-7974?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-7974?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.3 | ≥ 4.3.0, < 4.3.90 | 4.3.90 | NVD |
| 4.2 | ≥ 4.2.0, < 4.2.8 | 4.2.8 | NVD |
| 4.2 | = 4.2.8 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.0 | = 8.0 | no fix published | NVD |
| 9.0 | = 9.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| — | all versions | no fix published | NVD |
3 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Siemens TIM 4R-IE Devices
SIPLUS NET TIM 4R-IE (6AG1800-4BA00-7AA0) · SIPLUS NET TIM 4R-IE DNP3 (6AG1803-4BA00-7AA0) · TIM 4R-IE (6NH7800-4BA00) · +1 more
Fix
- Update Ntp to 4.3.90 · 4.2.8
- Workaround from the vendor CISA ICSA-21-103-11 · 4 productsDeactivate NTP-based time syncronization of the device, if enabled. The feature is disabled by default.
- Workaround from the vendor CISA ICSA-21-103-11 · 4 productsConfigure an additional firewall to prevent communication to the port udp/123 of an affected device.
- No fix planned, says the vendor CISA ICSA-21-103-11 · 4 productsCurrently no fix is planned
Advisories and patches
- bugs.ntp.orgVendor Advisory
- support.ntp.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.17.7read 2026-10-23
- NVDCVSS 2.04read 2026-10-23
- NVDweakness (CWE)CWE-287read 2026-10-23
- FIRST EPSSEPSS score5.7 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
- Published
- 2016-01-26
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2015-7974?
Is CVE-2015-7974 actively exploited?
What is the CVSS score for CVE-2015-7974?
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