The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates…

Description

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer.

Scores

EPSS (exploitation in 30 days)

0.90% · top 40% of all CVEs (4 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.

Weakness

• n/a
• CWE-17 (opens in a new tab)All about CWE-17 and its CVEs

Affected products

• n/a

  • affected n/a

References (24)

• DSA-3222 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• 20150408 Network Time Protocol Daemon Symmetric Mode Packet Processing Denial of Service Vulnerability (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
• [chrony-announce] 20150407 chrony-1.31.1 released (security) (opens in a new tab)mailing-listx_refsource_MLISTx_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
• 73950 (opens in a new tab)vdb-entryx_refsource_BIDx_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
• 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
• http://support.apple.com/kb/HT204942 (opens in a new tab)x_refsource_CONFIRMx_transferred
• HPSBHF03557 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
• RHSA-2015:1459 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• http://bugs.ntp.org/show_bug.cgi?id=2781 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 20150408 Multiple Vulnerabilities in ntpd (April 2015) Affecting Cisco Products (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
• DSA-3223 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• 1032031 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_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

[![CVE-2015-1799](https://trackcve.app/badge/CVE-2015-1799.svg)](https://trackcve.app/cve/CVE-2015-1799)

Record last updated 6 Aug 2024, 04:54 UTC.