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CVE-2026-20045Cisco Unified Communications Products Remote Code Execution Vulnerability

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.

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Cisco Unified Communications Products Code Injection Vulnerability.

Added
21 Jan 2026
Fix due (US federal)
11 Feb 2026
Used by ransomware
Not known

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

ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 21 Jan 2026.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.

Timeline

  1. ID reserved

    By cisco

  2. · 4 months later

    Published

  3. Added to CISA KEV

    Known exploited in the wild

  4. · 36 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-20045, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
NVDNVD · Analyzed3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
4.5% · top 8.3% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: active · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.

Affected products

  • Cisco · 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
    • affected 15.0.1.13013-1
    • affected 15.0.1.13014-1
    • affected 15.0.1.13015-1
    • affected 15.0.1.13016-1
    • affected 15.0.1.13017-1
    • affected 15SU3a

  • Cisco · 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 · 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

What to do

Exploitation: The Cisco PSIRT is aware of attempted exploitation of this vulnerability in the wild. Cisco strongly recommends that customers upgrade to a fixed software release to remediate this vulnerability.

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-20045 badge
[![CVE-2026-20045](https://cveledger.app/badge/CVE-2026-20045.svg)](https://cveledger.app/cve/CVE-2026-20045)

Record last updated .