Unified Communications Manager
CVE-2026-20045
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessSend crafted HTTP request
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ExploitBypass input validation
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ExecutionInject malicious commands
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ImpactExecute arbitrary commands on OS
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Code injection prevention, sandbox exec
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | No special conditions — remote unauthenticated exploitation against default configurations of Cisco Unified Communications Manager, Unified CM SME, Unified CM IM&P, Unity Connection, or Webex Calling Dedicated Instance with HTTP interface accessible. |
| Impact | CVSS 8.2 (High). KEV-listed — actively exploited. No authentication required. Affects multiple critical Cisco collaboration products simultaneously. EPSS 1.0%. These systems often hold sensitive communications data and have extensive network access. |
| Exploit ScenarioDerived | An attacker sends crafted requests to the web management interface of Cisco Unified CM, exploiting insufficient input validation to inject code that executes on the underlying server. Successful exploitation provides access to call detail records, voicemail, IM logs, and the ability to intercept or redirect communications. The attacker can also use the compromised system as a pivot point for lateral movement within the enterprise network. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Cisco Unified Communications Manager and related products contain a code injection vulnerability (CVE-2026-20045) that allows unauthenticated remote attackers to execute arbitrary code. This KEV-listed vulnerability affects the core enterprise voice/video infrastructure including Unified CM, IM&P, Unity Connection, and Webex Calling Dedicated Instance, making it a high-priority threat for organizations dependent on Cisco collaboration tools.
Earlier versions of this analysis (1)
Cisco Unified Communications Manager and related products contain a code injection vulnerability (CWE-94) in the web-based management interface that allows unauthenticated remote code execution.
RemediationAI
Apply Cisco security updates immediately. Restrict management interface access to trusted admin networks. Monitor for suspicious web requests to Unified CM management ports. Review call detail records and audit logs for signs of compromise.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The vulnerability exists in the web management interface shared across multiple Cisco collaboration products. Insufficient input validation allows an unauthenticated remote attacker to inject and execute arbitrary code on the underlying operating system. These products form the backbone of enterprise voice, video, and instant messaging infrastructure, and typically have broad network accessibility for management purposes.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device.
This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root. Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root.
Executive ViewAI
CVE-2026-20045 presents notable security risk, a code injection vulnerability rated CVSS 8.2. Successful exploitation could allow attackers to execute arbitrary code or commands on affected systems, potentially leading to full system compromise. This vulnerability is actively exploited in the wild (KEV-listed) and requires immediate remediation. Immediate patching is required per CISA KEV mandate.
Apply vendor patch. If immediate patching is not feasible: (1) Deploy WAF rules to block injection patterns; (2) Restrict network access to affected components; (3) Enable enhanced logging for suspicious activity.
Threat Intelligence Overview
NVD
CVE.org
CISA KEV
EPSS
VulDB
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.
What every action level means
SSVC AssessmentENISA
Priority Score
Affected Products (CPE)CVE.org
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GitHub PoC
Exploit-DB