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Fencer Intel
critical 9.8

CVE-2016-9877 json

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…

published 2016-12-29 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10668

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

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.

Patch / fix

  • rabbitmq-server Debian 14, Debian 13, Debian 12 3.6.6-1

debian advisories DEBIAN-CVE-2016-9877

  • rabbitmq-server Ubuntu 14.04 LTS 3.2.4-1ubuntu0.1
  • rabbitmq-server Ubuntu 16.04 LTS 3.5.7-1ubuntu0.16.04.2

ubuntu advisories UBUNTU-CVE-2016-9877

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-9877 updated cvss 5.9

rabbitmq: MQTT connection authentication succeeds with empty password

  • Red Hat Enterprise Linux OpenStack Platform 5 (Icehouse) rabbitmq-server Red Hat Enterprise Linux OpenStack Platform 6 (Juno) rabbitmq-server Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) rabbitmq-server Red Hat OpenStack Platform 8 (Liberty) rabbitmq-server Red Hat OpenStack Platform 9 (Mitaka) rabbitmq-server Red Hat OpenStack Platform 10 (Newton) rabbitmq-server
    +2 more products
    Red Hat OpenStack Platform 11 (Ocata) rabbitmq-server Red Hat Storage Console 2 rabbitmq-server
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a Pivotal RabbitMQ 3.x before 3.5.8 and 3.6.x before 3.6.6; 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

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.