What is the CVSS score of CVE-2021-20826?

CVE-2021-20826 has a CVSS 3.1 base score of 7.6 (High). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L. EPSS exploitation probability: 0.4%.

Microsmart Fc6A Firmware CVE-2021-20826

HIGH

Insufficiently Protected Credentials (CWE-522)

2021-12-24 vultures@jpcert.or.jp

Information Disclosure Microsmart Fc6A Firmware Microsmart Plus Fc6A Firmware Data File Manager Windedit Windldr

7.6

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.6 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

Low

Lifecycle Timeline

CVE Published

Dec 24, 2021 - 07:15 nvd

HIGH 7.6

DescriptionNVD

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.

AnalysisAI

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. Rated high severity (CVSS 7.6), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Insufficiently Protected Credentials (CWE-522), which allows attackers to obtain user credentials due to weak protection mechanisms. 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. Affected products include: Idec Microsmart Fc6A Firmware, Idec Microsmart Plus Fc6A Firmware, Idec Data File Manager, Idec Windedit, Idec Windldr.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Hash passwords with strong algorithms (bcrypt, argon2), encrypt credentials in transit and at rest, never log credentials.