Auth bypass in Ntp
CVE-2016-4953
ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (ephemeral-association demobilization) by sending a spoofed crypto-NAK packet with incorrect authentication data at a certain time.
Vulnerability class: Broken Authentication
EPSS: 0.127 (94.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Ntp — versions 4.2.8
- Oracle Solaris — versions 10, 11.3
- Siemens Simatic_net_cp_443-1_opc_ua
- Siemens Simatic_net_cp_443-1_opc_ua_firmware
- Siemens Tim_4r-ie
- Siemens Tim_4r-ie_dnp3
- Siemens Tim_4r-ie_dnp3_firmware
- Siemens Tim_4r-ie_firmware
- Opensuse Leap — versions 42.1
- Opensuse — versions 13.2
Weakness classification (CWE)
References
- SUSE-SU-2016:1602 (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- 91010 (Third Party Advisory, VDB Entry, vdb-entry, x_refsource_BID)
- openSUSE-SU-2016:1583 (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- FreeBSD-SA-16:24 (x_refsource_FREEBSD, vendor-advisory, Third Party Advisory)
- SUSE-SU-2016:1912 (vendor-advisory, x_refsource_SUSE)
- cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory)
- cve@mitre.org (x_refsource_CONFIRM, Patch, Vendor Advisory)
- 1036037 (Third Party Advisory, VDB Entry, vdb-entry, x_refsource_SECTRACK)
- SUSE-SU-2016:1584 (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-4953?
- CVE-2016-4953 is a high-severity vulnerability in Ntp, classified under Improper Authentication. CVSS score: 7.5/10. Published 2016-07-05.
- How severe is CVE-2016-4953?
- High severity. CVSS v3 base score is 7.5 out of 10.