7.6
HIGH
CVE-2021-20826
IDEC PLC Credentials Exfiltration
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.

INFO

Published Date :

Dec. 24, 2021, 7:15 a.m.

Last Modified :

Jan. 11, 2022, 6:18 p.m.

Remotely Exploitable :

No

Impact Score :

4.7

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2021-20826 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Idec microsmart_fc6a_firmware
2 Idec microsmart_plus_fc6a_firmware
3 Idec data_file_manager
4 Idec windedit
5 Idec windldr
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-20826.

URL Resource
https://jvn.jp/en/vu/JVNVU92279973/index.html Third Party Advisory
https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdf Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-20826 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-20826 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Jan. 11, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:A/AC:L/Au:N/C:P/I:N/A:N)
    Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
    Changed Reference Type https://jvn.jp/en/vu/JVNVU92279973/index.html No Types Assigned https://jvn.jp/en/vu/JVNVU92279973/index.html Third Party Advisory
    Changed Reference Type https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdf No Types Assigned https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdf Vendor Advisory
    Added CWE NIST CWE-522
    Added CPE Configuration AND OR *cpe:2.3:o:idec:microsmart_fc6a_firmware:*:*:*:*:*:*:*:* versions up to (including) 2.32 OR cpe:2.3:h:idec:microsmart_fc6a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:idec:microsmart_plus_fc6a_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.91 OR cpe:2.3:h:idec:microsmart_plus_fc6a:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:idec:data_file_manager:*:*:*:*:*:*:*:* versions up to (including) 2.12.1 *cpe:2.3:a:idec:windedit:*:*:*:*:*:*:*:* versions up to (including) 1.3.1 *cpe:2.3:a:idec:windldr:*:*:*:*:*:*:*:* versions up to (including) 8.19.1
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-20826 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.08 }} 0.01%

score

0.34017

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability