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Vulnerability details: VCID-6xkf-evrx-pyau
Vulnerability ID VCID-6xkf-evrx-pyau
Aliases CVE-2016-2166
GHSA-f5cf-f7px-xpmh
Summary Exposure of Sensitive Information to an Unauthorized Actor The (1) proton.reactor.Connector, (2) proton.reactor.Container, and (3) proton.utils.BlockingConnection classes in Apache Qpid Proton before 0.12.1 improperly use an unencrypted connection for an amqps URI scheme when SSL support is unavailable, which might allow man-in-the-middle attackers to obtain sensitive information or modify data via unspecified vectors.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-223 Omission of Security-relevant Information
System Score Found at
cvssv3.1 6.5 http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182414.html
generic_textual MODERATE http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182414.html
cvssv3.1 6.5 http://packetstormsecurity.com/files/136403/Apache-Qpid-Proton-0.12.0-SSL-Failure.html
generic_textual MODERATE http://packetstormsecurity.com/files/136403/Apache-Qpid-Proton-0.12.0-SSL-Failure.html
cvssv3.1 6.5 http://qpid.apache.org/releases/qpid-proton-0.12.1/release-notes.html
generic_textual MODERATE http://qpid.apache.org/releases/qpid-proton-0.12.1/release-notes.html
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
epss 0.00271 https://api.first.org/data/v1/epss?cve=CVE-2016-2166
cvssv3.1 6.5 https://github.com/advisories/GHSA-f5cf-f7px-xpmh
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-f5cf-f7px-xpmh
generic_textual MODERATE https://github.com/advisories/GHSA-f5cf-f7px-xpmh
cvssv3.1 6.5 https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=a058585
generic_textual MODERATE https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=a058585
cvssv3.1 6.5 https://issues.apache.org/jira/browse/PROTON-1157
generic_textual MODERATE https://issues.apache.org/jira/browse/PROTON-1157
cvssv3.1 6.5 https://lists.apache.org/thread.html/914424e4d798a340f523b6169aaf39b626971d9bb00fcdeb1d5d6c0d@%3Ccommits.qpid.apache.org%3E
generic_textual MODERATE https://lists.apache.org/thread.html/914424e4d798a340f523b6169aaf39b626971d9bb00fcdeb1d5d6c0d@%3Ccommits.qpid.apache.org%3E
cvssv2 5.8 https://nvd.nist.gov/vuln/detail/CVE-2016-2166
cvssv3 6.5 https://nvd.nist.gov/vuln/detail/CVE-2016-2166
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2016-2166
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2016-2166
cvssv3.1 6.5 http://www.securityfocus.com/archive/1/537864/100/0/threaded
generic_textual MODERATE http://www.securityfocus.com/archive/1/537864/100/0/threaded
Reference id Reference type URL
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182414.html
http://packetstormsecurity.com/files/136403/Apache-Qpid-Proton-0.12.0-SSL-Failure.html
http://qpid.apache.org/releases/qpid-proton-0.12.1/release-notes.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-2166.json
https://api.first.org/data/v1/epss?cve=CVE-2016-2166
https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git%3Bh=a058585
https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=a058585
https://issues.apache.org/jira/browse/PROTON-1157
https://lists.apache.org/thread.html/914424e4d798a340f523b6169aaf39b626971d9bb00fcdeb1d5d6c0d@%3Ccommits.qpid.apache.org%3E
https://lists.apache.org/thread.html/914424e4d798a340f523b6169aaf39b626971d9bb00fcdeb1d5d6c0d%40%3Ccommits.qpid.apache.org%3E
http://www.securityfocus.com/archive/1/537864/100/0/threaded
1320842 https://bugzilla.redhat.com/show_bug.cgi?id=1320842
cpe:2.3:a:apache:qpid_proton:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:qpid_proton:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
CVE-2016-2166 https://nvd.nist.gov/vuln/detail/CVE-2016-2166
GHSA-f5cf-f7px-xpmh https://github.com/advisories/GHSA-f5cf-f7px-xpmh
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182414.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at http://packetstormsecurity.com/files/136403/Apache-Qpid-Proton-0.12.0-SSL-Failure.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at http://qpid.apache.org/releases/qpid-proton-0.12.1/release-notes.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://github.com/advisories/GHSA-f5cf-f7px-xpmh
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=a058585
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://issues.apache.org/jira/browse/PROTON-1157
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://lists.apache.org/thread.html/914424e4d798a340f523b6169aaf39b626971d9bb00fcdeb1d5d6c0d@%3Ccommits.qpid.apache.org%3E
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2016-2166
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2016-2166
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2016-2166
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Found at http://www.securityfocus.com/archive/1/537864/100/0/threaded
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.50504
EPSS Score 0.00271
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:48:00.330673+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.qpid/proton-j/CVE-2016-2166.yml 38.0.0