CVE-2021-1478

Cisco Unified Communications Manager Denial of Service Vulnerability

MEDIUM
6.5
CVSS Score
Published: May 6, 2021 at 12:41 PM UTC
Updated: June 17, 2026 at 03:31 AM UTC
2 products affected across 1 vendorUnified Communications ManagerHosted Collaboration Mediation Fulfillment

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

A vulnerability in the Java Management Extensions (JMX) component of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected system. This vulnerability is due to an unsecured TCP/IP port. An attacker could exploit this vulnerability by accessing the port and restarting the JMX process. A successful exploit could allow the attacker to cause a DoS condition on an affected system.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 12.6
Affected range stops below 12.6, so it looks safe — our inference, not a vendor statement
v < 12.6
Affected range stops below 12.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284NVD-CWE-Other

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