How severe is CVE-2016-1567?

CVE-2016-1567 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-1567 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1567?

CVE-2016-1567 primarily affects Tuxfamily Chrony. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-1567?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-1567 published?

CVE-2016-1567 was published on 2016-01-26 and last updated on 2026-06-17.

CVE-2016-1567

CVE-2016-1567 is a high-severity vulnerability in Tuxfamily Chrony with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-254.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-254
Affected product: Tuxfamily Chrony
Published: 2016-01-26
Last modified: 2026-06-17

Description

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."

Frequently asked questions

What is CVE-2016-1567?: 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."
How severe is CVE-2016-1567?: CVE-2016-1567 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-1567 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1567?: CVE-2016-1567 primarily affects Tuxfamily Chrony. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-1567?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-1567 published?: CVE-2016-1567 was published on 2016-01-26 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:tuxfamily:chrony:*:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:2.0:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:2.1:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:2.2:*:*:*:*:*:*:*

More vulnerabilities in Tuxfamily Chrony

CVE-2015-1853 — Medium (CVSS 6.5): chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which…
CVE-2015-1822 — Medium (CVSS 6.5): chrony before 1.31.1 does not initialize the last "next" pointer when saving unacknowledged replies to command…
CVE-2015-1821 — Medium (CVSS 6.5): Heap-based buffer overflow in chrony before 1.31.1 allows remote authenticated users to cause a denial of service…
CVE-2020-14367 — Medium (CVSS 6.0): A flaw was found in chrony versions before 3.5.1 when creating the PID file under the /var/run/chrony folder. The file…
CVE-2012-4503 — Medium (CVSS 5.0): cmdmon.c in Chrony before 1.29 allows remote attackers to obtain potentially sensitive information from stack memory…
CVE-2012-4502 — Medium (CVSS 5.0): Multiple integer overflows in pktlength.c in Chrony before 1.29 allow remote attackers to cause a denial of service…

All CVEs affecting Tuxfamily Chrony →

Other CWE-254 vulnerabilities

CVE-2016-5788 — Critical (CVSS 10.0): General Electric (GE) Bently Nevada 3500/22M USB with firmware before 5.0 and Bently Nevada 3500/22M Serial have open…
CVE-2015-3972 — Critical (CVSS 10.0): The web interface on Janitza UMG 508, 509, 511, 604, and 605 devices supports only short PIN values for authentication,…
CVE-2015-1158 — Critical (CVSS 10.0): The add_job function in scheduler/ipp.c in cupsd in CUPS before 2.0.3 performs incorrect free operations for…
CVE-2019-15149 — Critical (CVSS 9.8): core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a…
CVE-2017-8227 — Critical (CVSS 9.8): Amcrest IPM-721S V2.420.AC00.16.R.20160909 devices have a timeout policy to wait for 5 minutes in case 30 incorrect…
CVE-2016-9568 — Critical (CVSS 9.8): A security design issue can allow an unprivileged user to interact with the Carbon Black Sensor and perform…

Browse all CWE-254 vulnerabilities →