Johnson Controls victor Application Server Deserialization RCE (CVE-2026-21655)

critical Nessus Plugin ID 373882

Synopsis

An OT application is affected by a deserialization vulnerability.

Description

The Johnson Controls victor Application Server running on the remote host is affected by a deserialization vulnerability. An unauthenticated, remote attacker could exploit this, via specially crafted messages, to execute arbitrary code under the security context of SYSTEM.

Solution

Update to version 4.20 or later.

Plugin Details

Severity: Critical

ID: 373882

File Name: johnson_controls_victor_application_server_cve-2026-21655.nbin

Version: 1.1

Type: Remote

Family: SCADA

Published: 10/29/2026

Updated: 10/29/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.14

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-21655

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: x-cpe:/a:johnsoncontrols:victor_application_server

Exploited by Nessus: true

Patch Publication Date: 7/23/2026

Vulnerability Publication Date: 7/23/2026

Reference Information

CVE: CVE-2026-21655

Detections

Analytics