Medium severity · published Dec 9, 2019
CVE-2015-1853
chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which allows remote attackers with knowledge of NTP peering to cause a…
6.5
CVSS
1.7%
EPSS
No
On KEV
Description
chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which allows remote attackers with knowledge of NTP peering to cause a denial of service (inability to synchronize) via random timestamps in crafted NTP data packets.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 77% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CH
Chrony · Tuxfamily
before 1.31.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2015-1853
CVE.org
https://www.cve.org/CVERecord?id=CVE-2015-1853
Release Notes
http://chrony.tuxfamily.org/News.html
Third Party Advisory
https://security.gentoo.org/glsa/201507-01
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