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CVE-2016-1547
An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec…
Medium5.3EPSS 5.1%
- Published
- Updated
- Reserved
- Assigned by
- certcc
Description
An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.
Timeline
ID reserved
By certcc
- 12 months later
· 12 months later
Published
- 8 years later
· 8 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 5.1% · top 7.6% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
Affected products
- affected 4.2.8p3
- affected 4.2.8p4
- affected a5fb34b9cc89b92a8fef2f459004865c93bb7f92
References (15)
- 88276 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- DSA-3629 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2016:1141 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2016:1552 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 1035705 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://security.netapp.com/advisory/ntap-20171004-0002/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.talosintelligence.com/reports/TALOS-2016-0081/ (opens in a new tab)x_refsource_MISCx_transferred
- FreeBSD-SA-16:16 (opens in a new tab)vendor-advisoryx_refsource_FREEBSDx_transferred
- GLSA-201607-15 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2016-1547)Record last updated .