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CVE-2026-20045

Cisco Unified Communications Products Remote Code Execution Vulnerability

CVSS 3.1 High 8.2Known exploited (CISA KEV)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

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.

Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 High 8.2

Score published by cisco in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Unchanged

    The impact stays within the vulnerable component.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: Low

    Limited effect on the trustworthiness of data.

  • Availability impact: None

    No effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.04541 (4.5% probability)
Percentile
91.6%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
Cisco Unified Communications Products Code Injection Vulnerability
Added to the catalog
Jan 21, 2026
Federal due date
Feb 11, 2026

CISA assessment as of Jan 22, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
yes
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-94Improper Control of Generation of Code

Affected products

Products listed in the CVE record, as the CNA published them.

  • Cisco Unified Communications Manager

    • affected: 12.5(1)SU2
    • affected: 12.5(1)SU1
    • affected: 12.5(1)
    • affected: 12.5(1)SU3
    • affected: 12.5(1)SU4
    • affected: 14
    • affected: 12.5(1)SU5
    • affected: 14SU1
    • affected: 12.5(1)SU6
    • affected: 14SU2
    • affected: 12.5(1)SU7
    • affected: 12.5(1)SU7a
    • affected: 14SU3
    • affected: 12.5(1)SU8
    • affected: 12.5(1)SU8a
    • affected: 15
    • affected: 15SU1
    • affected: 14SU4
    • affected: 14SU4a
    • affected: 15SU1a
    • affected: 12.5(1)SU9
    • affected: 15SU2
    • affected: 15.0.1.13010-1
    • affected: 15.0.1.13011-1
    • affected: 15.0.1.13012-1
    • and 6 more

  • Cisco Unified Communications Manager IM and Presence Service

    • affected: 12.5(1)
    • affected: 12.5(1)SU1
    • affected: 12.5(1)SU2
    • affected: 12.5(1)SU3
    • affected: 12.5(1)SU4
    • affected: 14
    • affected: 12.5(1)SU5
    • affected: 14SU1
    • affected: 12.5(1)SU6
    • affected: 14SU2
    • affected: 14SU2a
    • affected: 12.5(1)SU7
    • affected: 14SU3
    • affected: 12.5(1)SU8
    • affected: 15
    • affected: 15SU1
    • affected: 14SU4
    • affected: 12.5(1)SU9
    • affected: 15SU2
    • affected: 15SU3

  • Cisco Unity Connection

    • affected: 12.5(1)
    • affected: 12.5(1)SU1
    • affected: 12.5(1)SU2
    • affected: 12.5(1)SU3
    • affected: 12.5(1)SU4
    • affected: 14
    • affected: 12.5(1)SU5
    • affected: 14SU1
    • affected: 12.5(1)SU6
    • affected: 14SU2
    • affected: 12.5(1)SU7
    • affected: 14SU3
    • affected: 12.5(1)SU8
    • affected: 14SU3a
    • affected: 12.5(1)SU8a
    • affected: 15
    • affected: 15SU1
    • affected: 14SU4
    • affected: 12.5(1)SU9
    • affected: 15SU2
    • affected: 15SU3

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Added to CISA KEV
  3. Record published
  4. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:50 UTC. Sources and licenses