What is the CVSS score of CVE-2016-9877?

CVE-2016-9877 has a CVSS 3.0 base score of 9.8 (Critical). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Rabbitmq CVE-2016-9877

CRITICAL

Improper Access Control (CWE-284)

2016-12-29 security_alert@emc.com

Authentication Bypass Broadcom Rabbitmq Server Rabbitmq Pivotal Software

9.8

CVSS 3.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-284 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Access control enforcement MITRE ATT&CK 1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.33%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAI

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. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified under CWE-284. 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. Affected products include: Broadcom Rabbitmq Server, Pivotal Software Rabbitmq. Version information: before 3.5.8.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

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.

Threat Intelligence Overview

EPSS Score

0.3%

Top 44% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.3%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:broadcom:rabbitmq_server:3.0.0:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.0.1:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.0.2:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.0.3:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.0.4:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.1.0:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.1.1:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.1.2:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.1.3:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.1.4:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.1.5:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.2.0:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.2.1:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.2.2:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.2.3:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.2.4:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.3.0:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.3.1:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.3.2:*:*:*:*:*:*:*

cpe:2.3:a:broadcom:rabbitmq_server:3.3.3:*:*:*:*:*:*:*

+ 56 more

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References

Advisories & patches

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

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