Medium severity4.9NVD Advisory· Published Apr 21, 2022· Updated Jun 17, 2026

CVE-2022-20789

Description

A vulnerability in the software upgrade process of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to write arbitrary files on the affected system. This vulnerability is due to improper restrictions applied to a system script. An attacker could exploit this vulnerability by using crafted variables during the execution of a system upgrade. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./Unified Communications Manager6 versions
cpe:2.3:a:cisco:unified_communications_manager:12.5\(1\):*:*:*:-:*:*:*+ 5 more
- cpe:2.3:a:cisco:unified_communications_manager:12.5\(1\):*:*:*:-:*:*:*
- cpe:2.3:a:cisco:unified_communications_manager:12.5\(1\):*:*:*:session_management:*:*:*
- cpe:2.3:a:cisco:unified_communications_manager:14.0:*:*:*:-:*:*:*
- cpe:2.3:a:cisco:unified_communications_manager:14.0:*:*:*:session_management:*:*:*
- (no CPE)
- (no CPE)range: n/a
Cisco Systems, Inc./Cisco Unified Communications Manager Session Management Editionllm-fuzzy

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-arb-write-74QzruUUnvdVendor Advisory

News mentions

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cvss	0.319
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000