Command Injection in Avocent ACS8000 WebSocket Daemon by Emerson
CVE-2026-65184

9.8CRITICAL

Key Information:

Vendor

Vertiv

Status
Avocent Acs8000
Vendor
CVE Published:
26 October 2026

What is CVE-2026-65184?

The Avocent ACS8000's wsserver daemon is vulnerable to command injection due to inadequate handling of client-supplied WebSocket input. Specifically, it constructs shell commands directly from user inputs and executes them using system() and popen(), without appropriate sanitization or validation. Additionally, there are no session checks during public-key handling, which may allow unauthorized command execution. This flaw underscores the necessity for rigorous input validation and session management to secure the affected system.

Affected Version(s)

Avocent ACS8000 0 <= 2.32.4

References

https://www.runzero.com/advisories/avocent-acs8000-wsserv...
third-party-advisory
https://www.runzero.com/blog/lights-out-exposed/
related

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

HD Moore of runZero
Tod Beardsley of runZero
.