CVE-2021-20826 Information disclosure in IDEC PLC

High 7.6 Published 24 Dec 2021 Updated 3 Aug 2024

Attackers can intercept unprotected credentials to gain full access to IDEC PLC web servers, enabling output manipulation or suspension.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-20826?

CVE-2021-20826 is a high-severity vulnerability in IDEC PLC, published on 24 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Unprotected transport of credentials vulnerability in IDEC PLCs (FC6A Series MICROSmart All-in-One CPU module v2.32 and earlier, FC6A Series MICROSmart Plus CPU module v1.91 and earlier, WindLDR v8.19.1 and earlier, WindEDIT Lite v1.3.1 and earlier, and Data File Manager v2.12.1 and earlier) allows an attacker to obtain the PLC Web server user credentials from the communication between the PLC and the software. As a result, the complete access privileges to the PLC Web server may be obtained, and manipulation of the PLC output and/or suspension of the PLC may be conducted.

Weakness: CWE-522

Which versions are affected by CVE-2021-20826?

It affects 5 products.

Products include Idec Data File Manager, Idec Microsmart Fc6a Firmware, Idec Microsmart Plus Fc6a Firmware, Idec Windedit, Idec Windldr.

How do I fix CVE-2021-20826?

No fix has been published for CVE-2021-20826 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-20826 being exploited?

There is no known exploitation of CVE-2021-20826 in the wild and no public exploit code.

Sources

Also known as GHSA-v3cv-2j8p-p6xh.