CVE-2026-20045

CRITICAL CISA KEV EPSS 89.9%
Published Jan 21, 20265mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Jan 21, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago
KEV Listed Jan 21, 2026 5mo ago
KEV Due Feb 11, 2026 140d overdue

Description

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

CISA Known Exploited Overdue 140d
Added
Jan 21, 2026
Due
Feb 11, 2026

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

EPSS Exploit Probability
89.9% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available

Weaknesses 1

CWE-94 Improper Control of Generation of Code (Code Injection) Injection

Affected Products 8

VendorProductVersionRange
ciscounified_communications_manager*≥12.5  –  <14su5
ciscounified_communications_manager*≥12.5  –  <14su5
ciscounified_communications_manager*≥15.0  –  ≤15su3a
ciscounified_communications_manager*≥15.0  –  ≤15su3a
ciscounified_communications_manager_im_and_presence_service*≥12.5  –  <14su5
ciscounified_communications_manager_im_and_presence_service*≥15.0  –  ≤15su3a
ciscounity_connection*≥12.5  –  <14su5
ciscounity_connection*≥15.0  –  ≤15su3

References 2

  • sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-rce-mORhqY4b
    Vendor Advisory
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20045
    US Government Resource

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.