Overview
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 contain a code injection vulnerability that could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-rce-mORhqY4b ; https://nvd.nist.gov/vuln/detail/CVE-2026-20045
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2026-20045 |
| Vendor / Product | Cisco — Unified Communications Manager |
| NVD Published | 2026-01-21 |
| NVD Last Modified | 2026-02-13 |
| CVSS 3.1 Score | 8.2 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
| Severity | HIGH |
| CWE | CWE-94 |
| CISA KEV Added | 2026-01-21 |
| CISA KEV Deadline | 2026-02-11 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Required Action
CISA BOD 22-01 Deadline: 2026-02-11.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2026-01-21 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2026-02-11 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2026-20045 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |