CVE-2016-1866

Salt 2015.8.x before 2015.8.4 does not properly handle clear messages on the minion, which allows man-in-the-middle attackers to execute arbitrary code by inserting packets into the minion-master data stream.

Published: 2016-04-12 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-1866 is rated Moderate Risk (58.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.52%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-1866

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.63% 1.52% +0.89%
2 2025-11-19 0.89% 0.63% -0.27%
3 2025-03-30 — 0.89% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-1866

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.0 HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2016-1866

GitHub Security Advisory for CVE-2016-1866

OS Trackers for CVE-2016-1866

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2016-1866
suse high CVE-2016-1866 severity important: SUSE including 380 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 504 product×package rows across 35 product lines (SUSE CaaS Platform 3.0, SUSE Enterprise Storage 7.1, … (35 product lines)): Known Affected 231, Known Not Affected 139, Fixed 134. https://www.suse.com/security/cve/CVE-2016-1866/
ubuntu medium CVE-2016-1866 medium priority: Ubuntu including 1 source packages (salt), 20 status rows across 20 suites (artful, bionic, cosmic, disco, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, precise, questing, trusty, upstream, wily, xenial, yakkety, zesty): not-affected 10, DNE 8, ignored 1, released 1. https://ubuntu.com/security/CVE-2016-1866

Affected software / configurations for CVE-2016-1866

Vendor Product Version Raw CPE
saltstack salt 2015.8.0 cpe:2.3:a:saltstack:salt:2015.8.0:*:*:*:*:*:*:*
saltstack salt 2015.8.1 cpe:2.3:a:saltstack:salt:2015.8.1:*:*:*:*:*:*:*
saltstack salt 2015.8.2 cpe:2.3:a:saltstack:salt:2015.8.2:*:*:*:*:*:*:*
saltstack salt 2015.8.3 cpe:2.3:a:saltstack:salt:2015.8.3:*:*:*:*:*:*:*
opensuse leap 42.1 cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*

References for CVE-2016-1866

cvelogic Threat Intelligence