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Vulnerability record · CVE-2016-9877 · published 29 December 2016

CVE-2016-9877: Broadcom rabbitmq server improper access control vulnerability

Broadcom · Rabbitmq Server

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.

9.8 CVSS 3.0 Critical EPSS 1.4% · top 28.8% CWE-284 · Improper access control
9.8CVSS 3.0 base score, v2 7.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.debian.org/security/2017/dsa-3761
http://www.securityfocus.com/bid/95065
https://pivotal.io/security/cve-2016-9877 MitigationVendor Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03880en_us
http://www.debian.org/security/2017/dsa-3761
http://www.securityfocus.com/bid/95065
https://pivotal.io/security/cve-2016-9877 MitigationVendor Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03880en_us

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-9877), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.