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Fencer Vulns
high 8.1

CVE-2016-1567 json

chrony before 1.31.2 and 2.x before 2.2.1 do not verify peer associations of symmetric keys when authenticating packets, which might allow…

published 2016-01-26 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-2662

cvss
8.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

chrony before 1.31.2 and 2.x before 2.2.1 do not verify peer associations of symmetric keys when authenticating packets, which might allow remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a "skeleton key."

Patch / fix

  • chrony Debian 14, Debian 13, Debian 12 2.2.1-1

debian advisories DEBIAN-CVE-2016-1567

  • chrony Ubuntu 14.04 LTS 1.29-1ubuntu0.1
  • chrony Ubuntu 16.04 LTS 2.1.1-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2016-1567

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chrony openSUSE Tumbleweed 2.4.1-1.1

opensuse advisories openSUSE-SU-2024:10345-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-1567 updated cvss 3.6

chrony: missing key check allows impersonation between authenticated peers (VU#357792)

  • Red Hat Enterprise Linux 6 chrony Red Hat Enterprise Linux 7 chrony
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.16% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintel.com http://www.talosintel.com/reports/TALOS-2016-0071/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.