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CVE-2016-1567

21
FAUCET Score

CVE-2016-1567 describes a "skeleton key" vulnerability in chrony versions prior to 1.31.2 and 2.2.1. This flaw allows remote attackers to impersonate legitimate peers by exploiting chrony's failure to verify peer associations of symmetric keys during packet authentication. With a CVSS score of 8.1 (HIGH), this vulnerability is network-exploitable with high impact on confidentiality, integrity, and availability, but requires high attack complexity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.31.1CPE matchmatch criteria
cpe:2.3:a:tuxfamily:chrony:*:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:a:tuxfamily:chrony:2.0:*:*:*:*:*:*:*
2.1CPE matchmatch criteria
cpe:2.3:a:tuxfamily:chrony:2.1:*:*:*:*:*:*:*
2.1.1CPE matchmatch criteria
cpe:2.3:a:tuxfamily:chrony:2.1.1:*:*:*:*:*:*:*
2.2CPE matchmatch criteria
cpe:2.3:a:tuxfamily:chrony:2.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.64%
Probability of exploitation in next 30 days
EPSS Percentile
84.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0264 is in the 42nd percentile among its peer group of 8,915 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

fedorapatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: chrony
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: chrony

Vendor Advisories (1)

redhatCVE-2016-1567Low

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

Jan 20, 2016

References

chrony.tuxfamily.org / news.html
Vendor Advisory
lists.fedoraproject.org / pipermail/package-announce/2016-February/176559.html
lists.fedoraproject.org / pipermail/package-announce/2016-January/175969.html
Patch
talosintel.com / reports/TALOS-2016-0071
Exploit