What is CVE-2015-1853?

CVE-2015-1853 is a medium-severity vulnerability in Chrony. CVSS score: 6.5/10. Published 2019-12-09.

How severe is CVE-2015-1853?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Chrony

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 denial of service (inability to synchronize) via random timestamps in crafted NTP data packets.

EPSS: 0.017 (74.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Chrony — versions before 1.31.1
Tuxfamily Chrony

References

secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
secalert@redhat.com (x_refsource_MISC, Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2015-1853?: CVE-2015-1853 is a medium-severity vulnerability in Chrony. CVSS score: 6.5/10. Published 2019-12-09.
How severe is CVE-2015-1853?: Medium severity. CVSS v3 base score is 6.5 out of 10.