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CVE-2015-1798
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…
- 1.8LowCVSS base score
- 2.2%Exploitation in 30 daysEPSS · top 17% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By redhat
- 50 days later
· 50 days later
Published
- 9 years later
· 9 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 | 2.0 | Low1.8 | AV:A/AC:H/Au:N/C:N/I:P/A:N |
- EPSS (exploitation in 30 days)
- 2.2% · top 17% of all CVEs (10 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 1.8.
Affected products
n/a
- affected n/a
References
21
- 1032032 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- USN-2567-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- VU#374268 (opens in a new tab)third-party-advisoryx_refsource_CERT-VNx_transferred
- SSRT102029 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
- FEDORA-2015-5761 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://kc.mcafee.com/corporate/index?page=content&id=SB10114 (opens in a new tab)x_refsource_CONFIRMx_transferred
- FEDORA-2015-5874 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- APPLE-SA-2015-06-30-2 (opens in a new tab)vendor-advisoryx_refsource_APPLEx_transferred
- openSUSE-SU-2015:0775 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- GLSA-201509-01 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- 20150408 Network Time Protocol Daemon MAC Checking Failure Authentication Bypass Vulnerability (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
- MDVSA-2015:202 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
- http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- 73951 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- http://support.apple.com/kb/HT204942 (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2015:1459 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 20150408 Multiple Vulnerabilities in ntpd (April 2015) Affecting Cisco Products (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
- http://bugs.ntp.org/show_bug.cgi?id=2779 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3223 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_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)
- EUVD EUVD-2015-1923 (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)
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[](https://cveledger.app/cve/CVE-2015-1798)Record last updated .