CVE-2020-24683

Authentication Bypass in Symphony Plus

CRITICAL
9.8
CVSS Score
Published: December 22, 2020 at 09:19 PM UTC
Updated: June 17, 2026 at 03:05 AM UTC
2 products affected across 1 vendorSymphony + OperationsSymphony + Historian

Using ABB Ability™ Symphony® Plus Operations by ABB?

Get instant alerts when new vulnerabilities affect ABB Ability™ Symphony® Plus Operations - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
CRITICAL9.8
Exploit prediction
EPSS 1%

Description

The affected versions of S+ Operations (version 2.1 SP1 and earlier) used an approach for user authentication which relies on validation at the client node (client-side authentication). This is not as secure as having the server validate a client application before allowing a connection. Therefore, if the network communication or endpoints for these applications are not protected, unauthorized actors can bypass authentication and make unauthorized connections to the server application.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Affected range stops below 2.1 SP1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

9.8CRITICALABB
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-305CWE-602CWE-669

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card