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CVE-2026-20045

Cisco Unified Communications Manager

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 se...

CVSS
9.8
EPSS
4.31%
90.2% percentile
CISA KEV
Listed
Published
2026.01.22
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability4.31%
Technical severityCVSS 9.8

Vulnerability overview

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 se...

Affected product and versions

Product
Cisco Unified Communications Manager
Affected versions
12.5(1)SU2, 12.5(1)SU1, 12.5(1), 12.5(1)SU3, 12.5(1)SU4, 14, 12.5(1)SU5, 14SU1, 12.5(1)SU6, 14SU2, 12.5(1)SU7, 12.5(1)SU7a, 14SU3, 12.5(1)SU8, 12.5(1)SU8a, 15, 15SU1, 14SU4, 14SU4a, 15SU1a
Fixed versions
14su5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

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

Due date: 2026.02.11
  1. 1
    Identify

    Confirm that Cisco Unified Communications Manager and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-94
KEV added
2026.01.21
Ransomware use
미확인
CVE-2026-20045 — Cisco Unified Communications Manager | SECUFOCUS NOW