CVE-2016-9877

An issue was discovered in Pivotal RabbitMQ 3.x before 3.5.8 and 3.6.x before 3.6.6 and RabbitMQ for PCF 1.5.x before 1.5.20, 1.6.x before 1.6.12, and 1.7.x before 1.7.7. MQTT (MQ Telemetry Transport) connection authentication with a username/password pair succeeds if an existing username is provided but the password is omitted from the connection request. Connections that use TLS with a client-provided certificate are not affected.

Published: 2016-12-29 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-9877 is rated Moderate Risk (64.3/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.38%). EPSS rose +1.18% over the last day, indicating growing attacker interest. 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-2016-9877

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 0.20% 1.38% +1.18%
2 2026-05-31 0.33% 0.20% -0.13%
3 2025-07-30 — 0.33% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-9877

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/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:L)
Exploitation conditions are straightforward and predictable.
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.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2016-9877

OS Trackers for CVE-2016-9877

vendor priority summary link
debian not yet assigned CVE-2016-9877 not yet assigned priority: Debian including 1 source packages (rabbitmq-server), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-9877
redhat medium — https://access.redhat.com/security/cve/CVE-2016-9877
suse high CVE-2016-9877 severity important: SUSE including 30 source package names (erlang-rabbitmq-client, erlang-rabbitmq-client-3.13.7-160000.2.2, …), 32 product×package rows across 8 product lines (SUSE Enterprise Storage 2.1, SUSE Enterprise Storage 4, … (8 product lines)): Fixed 27, Known Not Affected 5. https://www.suse.com/security/cve/CVE-2016-9877/
ubuntu high CVE-2016-9877 high priority: Ubuntu including 1 source packages (rabbitmq-server), 6 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): released 3, ignored 2, not-affected 1. https://ubuntu.com/security/CVE-2016-9877

Affected software / configurations for CVE-2016-9877

Vendor Product Version Raw CPE
broadcom rabbitmq_server 3.0.0 cpe:2.3:a:broadcom:rabbitmq_server:3.0.0:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.0.1 cpe:2.3:a:broadcom:rabbitmq_server:3.0.1:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.0.2 cpe:2.3:a:broadcom:rabbitmq_server:3.0.2:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.0.3 cpe:2.3:a:broadcom:rabbitmq_server:3.0.3:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.0.4 cpe:2.3:a:broadcom:rabbitmq_server:3.0.4:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.1.0 cpe:2.3:a:broadcom:rabbitmq_server:3.1.0:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.1.1 cpe:2.3:a:broadcom:rabbitmq_server:3.1.1:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.1.2 cpe:2.3:a:broadcom:rabbitmq_server:3.1.2:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.1.3 cpe:2.3:a:broadcom:rabbitmq_server:3.1.3:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.1.4 cpe:2.3:a:broadcom:rabbitmq_server:3.1.4:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.1.5 cpe:2.3:a:broadcom:rabbitmq_server:3.1.5:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.2.0 cpe:2.3:a:broadcom:rabbitmq_server:3.2.0:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.2.1 cpe:2.3:a:broadcom:rabbitmq_server:3.2.1:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.2.2 cpe:2.3:a:broadcom:rabbitmq_server:3.2.2:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.2.3 cpe:2.3:a:broadcom:rabbitmq_server:3.2.3:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.2.4 cpe:2.3:a:broadcom:rabbitmq_server:3.2.4:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.3.0 cpe:2.3:a:broadcom:rabbitmq_server:3.3.0:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.3.1 cpe:2.3:a:broadcom:rabbitmq_server:3.3.1:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.3.2 cpe:2.3:a:broadcom:rabbitmq_server:3.3.2:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.3.3 cpe:2.3:a:broadcom:rabbitmq_server:3.3.3:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.3.4 cpe:2.3:a:broadcom:rabbitmq_server:3.3.4:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.3.5 cpe:2.3:a:broadcom:rabbitmq_server:3.3.5:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.4.0 cpe:2.3:a:broadcom:rabbitmq_server:3.4.0:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.4.1 cpe:2.3:a:broadcom:rabbitmq_server:3.4.1:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.4.2 cpe:2.3:a:broadcom:rabbitmq_server:3.4.2:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.4.3 cpe:2.3:a:broadcom:rabbitmq_server:3.4.3:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.4.4 cpe:2.3:a:broadcom:rabbitmq_server:3.4.4:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.5.0 cpe:2.3:a:broadcom:rabbitmq_server:3.5.0:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.5.1 cpe:2.3:a:broadcom:rabbitmq_server:3.5.1:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.5.2 cpe:2.3:a:broadcom:rabbitmq_server:3.5.2:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.5.3 cpe:2.3:a:broadcom:rabbitmq_server:3.5.3:*:*:*:*:*:*:*
broadcom rabbitmq_server 3.5.6 cpe:2.3:a:broadcom:rabbitmq_server:3.5.6:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.5.4 cpe:2.3:a:pivotal_software:rabbitmq:3.5.4:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.5.5 cpe:2.3:a:pivotal_software:rabbitmq:3.5.5:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.5.7 cpe:2.3:a:pivotal_software:rabbitmq:3.5.7:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.6.0 cpe:2.3:a:pivotal_software:rabbitmq:3.6.0:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.6.1 cpe:2.3:a:pivotal_software:rabbitmq:3.6.1:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.6.2 cpe:2.3:a:pivotal_software:rabbitmq:3.6.2:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.6.3 cpe:2.3:a:pivotal_software:rabbitmq:3.6.3:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.6.4 cpe:2.3:a:pivotal_software:rabbitmq:3.6.4:*:*:*:*:*:*:*
pivotal_software rabbitmq 3.6.5 cpe:2.3:a:pivotal_software:rabbitmq:3.6.5:*:*:*:*:*:*:*
pivotal_software rabbitmq 1.5.0 cpe:2.3:a:pivotal_software:rabbitmq:1.5.0:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.1 cpe:2.3:a:pivotal_software:rabbitmq:1.5.1:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.2 cpe:2.3:a:pivotal_software:rabbitmq:1.5.2:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.3 cpe:2.3:a:pivotal_software:rabbitmq:1.5.3:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.4 cpe:2.3:a:pivotal_software:rabbitmq:1.5.4:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.5 cpe:2.3:a:pivotal_software:rabbitmq:1.5.5:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.6 cpe:2.3:a:pivotal_software:rabbitmq:1.5.6:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.7 cpe:2.3:a:pivotal_software:rabbitmq:1.5.7:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.8 cpe:2.3:a:pivotal_software:rabbitmq:1.5.8:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.9 cpe:2.3:a:pivotal_software:rabbitmq:1.5.9:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.10 cpe:2.3:a:pivotal_software:rabbitmq:1.5.10:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.11 cpe:2.3:a:pivotal_software:rabbitmq:1.5.11:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.12 cpe:2.3:a:pivotal_software:rabbitmq:1.5.12:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.13 cpe:2.3:a:pivotal_software:rabbitmq:1.5.13:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.14 cpe:2.3:a:pivotal_software:rabbitmq:1.5.14:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.15 cpe:2.3:a:pivotal_software:rabbitmq:1.5.15:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.17 cpe:2.3:a:pivotal_software:rabbitmq:1.5.17:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.5.18 cpe:2.3:a:pivotal_software:rabbitmq:1.5.18:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.0 cpe:2.3:a:pivotal_software:rabbitmq:1.6.0:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.1 cpe:2.3:a:pivotal_software:rabbitmq:1.6.1:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.2 cpe:2.3:a:pivotal_software:rabbitmq:1.6.2:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.3 cpe:2.3:a:pivotal_software:rabbitmq:1.6.3:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.4 cpe:2.3:a:pivotal_software:rabbitmq:1.6.4:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.5 cpe:2.3:a:pivotal_software:rabbitmq:1.6.5:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.6 cpe:2.3:a:pivotal_software:rabbitmq:1.6.6:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.7 cpe:2.3:a:pivotal_software:rabbitmq:1.6.7:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.8 cpe:2.3:a:pivotal_software:rabbitmq:1.6.8:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.9 cpe:2.3:a:pivotal_software:rabbitmq:1.6.9:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.6.10 cpe:2.3:a:pivotal_software:rabbitmq:1.6.10:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.7.0 cpe:2.3:a:pivotal_software:rabbitmq:1.7.0:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.7.2 cpe:2.3:a:pivotal_software:rabbitmq:1.7.2:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.7.3 cpe:2.3:a:pivotal_software:rabbitmq:1.7.3:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.7.4 cpe:2.3:a:pivotal_software:rabbitmq:1.7.4:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.7.5 cpe:2.3:a:pivotal_software:rabbitmq:1.7.5:*:*:*:*:pivotal_cloud_foundry:*:*
pivotal_software rabbitmq 1.7.6 cpe:2.3:a:pivotal_software:rabbitmq:1.7.6:*:*:*:*:pivotal_cloud_foundry:*:*

References for CVE-2016-9877

cvelogic Threat Intelligence