Cisco Unified Communications System 6400

productDE

cpe:/a:cisco:unified_communications_system:6400

A product tracked in the threat graph; the vulnerabilities below are known to affect it.

KEV-listed

public exploit

EPSS ≥ 10%

critical

by severity

0critical0high2medium0low

updated 2026-10-28

vulnerabilities (2)

Related CVEs.

sort

ID	severity	EPSS	exploitable	patched	published	affected
CVE-2023-20015US	medium6.7	0.22% (13th)	—	no fix	2023-02-23	—
CVE-2023-20016US	medium6.5OT elevated	0.11% (1st)	—	no fix	2023-02-23	—

The flaw types (CWEs) most of these CVEs share.

CWE-321Use of Hard-coded Cryptographic Key1 CVEs
CWE-330Use of Insufficiently Random Values1 CVEs
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')1 CVEs
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')1 CVEs

Which sources assert this record, and when.

scry

Products carry known vulnerabilities once they are exposed to the internet. See what is exposed on your perimeter with a free passive scan.