CVE-2017-6791
HighSummary
A vulnerability in the Trust Verification Service (TVS) of Cisco Unified Communications Manager could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of Transport Layer Security (TLS) traffic by the affected software.
Risk Assessment
An attacker could exploit this vulnerability to deny access to the TVS for an affected device, resulting in a DoS condition until an administrator restarts the service.
Recommendation
It is recommended to update the software to the latest version to mitigate this vulnerability and to monitor TLS traffic for anomalies.
Other vulnerabilities in Cisco Unified Communications Manager
See all- CVE-2017-6757High
A vulnerability in Cisco Unified Communications Manager 10.5(2.10000.5), 11.0(1.10000.10), and 11.5(1.10000.6) allows an authenticated, remote attacker to conduct a blind SQL injection attack. The issue is due to a failure to validate user-supplied input used in SQL queries that bypass protection filters.
- CVE-2016-6364High
The User Data Services (UDS) API implementation in Cisco Unified Communications Manager 11.5 allows remote attackers to bypass intended access restrictions and obtain sensitive information via unspecified API calls.
- CVE-2026-20230HighActively exploited
A vulnerability in Cisco Unified Communications Manager and Unified CM SME allows an unauthenticated remote attacker to perform SSRF attacks. The attacker can write files to the OS, potentially leading to root privilege escalation. WebDialer service must be enabled (disabled by default).
- CVE-2026-76487Medium
A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct access control bypass attacks on an affected device. This is due to improper input validation for specific HTTP requests; an attacker could send a crafted HTTP request to access parts of the network beyond their intended scope.
- CVE-2026-76477High
Cisco conducted a comprehensive internal security review of Cisco Emergency Responder, Cisco Prime Collaboration Deployment, Cisco Unified Communications Manager, Cisco Unified CM IM & Presence, Cisco Unified CM SME, and Cisco Unity Connection, resulting in software hardening releases. The vulnerabilities tracked by CVE-2026-76477 relate to improper neutralization of special elements used in SQL commands (CWE-89).
- CVE-2025-20361Medium
XSS vulnerability in the web-based management interface of Cisco Unified Communications Manager (Unified CM) and Unified CM SME. An authenticated remote attacker can inject malicious code into specific pages, allowing script execution in the interface context or access to sensitive browser information.
Original NVD description (English source)
A vulnerability in the Trust Verification Service (TVS) of Cisco Unified Communications Manager could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of Transport Layer Security (TLS) traffic by the affected software. An attacker could exploit this vulnerability by generating incomplete traffic streams. A successful exploit could allow the attacker to deny access to the TVS for an affected device, resulting in a DoS condition, until an administrator restarts the service. Known Affected Releases 10.0(1.10000.24) 10.5(2.10000.5) 11.0(1.10000.10) 9.1(2.10000.28). Cisco Bug IDs: CSCux21905.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS