Home/CVE/chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which allows
CVE

CVE-2015-1853

chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which allows

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.

MEDIUM · CVSS 6.5 EPSS 0.00869
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
▤

Affected Products & Versions

1
tuxfamily chrony< 1.31.1
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Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Dec 2019 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

1
rhsaRHSA-2015:2241Moderate
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://chrony.tuxfamily.org/News.htmlRelease NotesVendor Advisory
https://security.gentoo.org/glsa/201507-01Third Party Advisory
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