Cisco Unity Connection Remote Code Execution Vulnerability
Priority MEDIUM 41CWE-35Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of a targeted device. To exploit this vulnerability, the attacker must have valid user credentials on the affected device.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00712 53rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco Unity Connection | 12.5(1); 12.5(1)SU1; 12.5(1)SU2; 12.5(1)SU3; 12.5(1)SU4; 14; 12.5(1)SU5; 14SU1; 12.5(1)SU6; 14SU2; 12.5(1)SU7; 14SU3; 12.5(1)SU8; 14SU3a; 12.5(1)SU8a; 15; 15SU1; 14SU4; 12.5(1)SU9; 15SU2; 15SU3 | — | No fix listed | CNA |
- Cisco Unity Connection VendorCisco Affected 12.5(1); 12.5(1)SU1; 12.5(1)SU2; 12.5(1)SU3; 12.5(1)SU4; 14; 12.5(1)SU5; 14SU1; 12.5(1)SU6; 14SU2; 12.5(1)SU7; 14SU3; 12.5(1)SU8; 14SU3a; 12.5(1)SU8a; 15; 15SU1; 14SU4; 12.5(1)SU9; 15SU2; 15SU3 Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:* | before 14.0 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:14.0:*:*:*:*:*:*:* | 14.0 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:14su1:*:*:*:*:*:*:* | 14su1 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:14su2:*:*:*:*:*:*:* | 14su2 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:14su3:*:*:*:*:*:*:* | 14su3 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:14su4:*:*:*:*:*:*:* | 14su4 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:15.0:*:*:*:*:*:*:* | 15.0 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:15su1:*:*:*:*:*:*:* | 15su1 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:15su2:*:*:*:*:*:*:* | 15su2 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:unity_connection:15su3:*:*:*:*:*:*:* | 15su3 | Vulnerable | Cisco |
- cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:* Versions before 14.0 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:14.0:*:*:*:*:*:*:* Versions 14.0 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:14su1:*:*:*:*:*:*:* Versions 14su1 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:14su2:*:*:*:*:*:*:* Versions 14su2 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:14su3:*:*:*:*:*:*:* Versions 14su3 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:14su4:*:*:*:*:*:*:* Versions 14su4 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:15.0:*:*:*:*:*:*:* Versions 15.0 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:15su1:*:*:*:*:*:*:* Versions 15su1 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:15su2:*:*:*:*:*:*:* Versions 15su2 Vulnerable ·Cisco
- cpe:2.3:a:cisco:unity_connection:15su3:*:*:*:*:*:*:* Versions 15su3 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-20034
- 2026-10-03 Alias added: GHSA-wfvp-xw34-rhwq
References
Advisory 1
More Cisco Unity Connection 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-2024-13188 Deserialization of untrusted data in Cisco Unified Contact Center Enterprise CVSS 3.1CRITICAL 10.0
- TI-2024-13207 Unrestricted file upload in Cisco Unity Connection CVSS 3.1CRITICAL 9.8
- TI-2017-09109 Improper authentication in Cisco Voice Operating System CVSS 3.0CRITICAL 9.8
- TI-2021-01089 Cisco Unified Communications Products Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
Sources
- CVE-2026-20034 · CVE Program
- CVE-2026-20034 · NVD
- FIRST EPSS
- GHSA-wfvp-xw34-rhwq · 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