Memory corruption in Cisco Unified Communications Manager
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Cisco Unified Communications Manager | Cisco Unified Communications Manager | — | No fix listed | CNA |
- Cisco Unified Communications Manager Vendor— Affected Cisco Unified Communications Manager Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:unified_communications_manager:9.1\(2.10000.28\):*:*:*:*:*:*:* | 9.1(2.10000.28) | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unified_communications_manager:10.0\(1.10000.24\):*:*:*:*:*:*:* | 10.0(1.10000.24) | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unified_communications_manager:10.5\(2.10000.5\):*:*:*:*:*:*:* | 10.5(2.10000.5) | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unified_communications_manager:11.0\(1.10000.10\):*:*:*:*:*:*:* | 11.0(1.10000.10) | Vulnerable | Cisco |
- cpe:2.3:a:cisco:unified_communications_manager:9.1\(2.10000.28\):*:*:*:*:*:*:* Versions 9.1(2.10000.28) Vulnerable ·Cisco
- cpe:2.3:a:cisco:unified_communications_manager:10.0\(1.10000.24\):*:*:*:*:*:*:* Versions 10.0(1.10000.24) Vulnerable ·Cisco
- cpe:2.3:a:cisco:unified_communications_manager:10.5\(2.10000.5\):*:*:*:*:*:*:* Versions 10.5(2.10000.5) Vulnerable ·Cisco
- cpe:2.3:a:cisco:unified_communications_manager:11.0\(1.10000.10\):*:*:*:*:*:*:* Versions 11.0(1.10000.10) Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-6791
- 2026-10-03 Alias added: GHSA-5qmr-j946-m785
References
More Cisco Unified Communications Manager vulnerabilities
- TI-2026-16259 Cisco Unified Communications Products Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
- TI-2026-16423 Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability KEVCVSS 3.1HIGH 8.6
- TI-2008-00019 Heap-based buffer overflow in the Certificate Trust List (CTL) Provider service… CVSS 2.0HIGH 10.0
- TI-2013-05779 The TFTP service in Cisco Unified Communications Manager (aka CUCM or Unified CM) allows… CVSS 3.1HIGH 7.3
- TI-2011-02932 Directory traversal vulnerability in Cisco Unified Communications Manager (CUCM) 5.x and… CVSS 2.0HIGH 7.8
Sources
- CVE-2017-6791 · CVE Program
- CVE-2017-6791 · NVD
- FIRST EPSS
- GHSA-5qmr-j946-m785 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences