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CVE-2015-1853

MEDIUMCVSS 6.5/10EPSS 1.70%

Last modified

CVE-2015-1853 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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 estimates a 1.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
1.70%

74.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
TuxfamilyChrony< 1.31.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2015-1853?
CVE-2015-1853 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.70% probability of exploitation in the next 30 days.
How do I fix CVE-2015-1853?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-1853?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST