CVE-2021-20826
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.39%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.6 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
- EPSS
- 0.39% probability · 33th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-522
- Affected
- idec/microsmart fc6a firmware · idec/microsmart plus fc6a firmware · idec/data file manager · idec/windedit · idec/windldr
- Source
- vultures@jpcert.or.jp
References
- https://jvn.jp/en/vu/JVNVU92279973/index.htmlThird Party Advisory
- https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdfVendor Advisory
- https://jvn.jp/en/vu/JVNVU92279973/index.htmlThird Party Advisory
- https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdfVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.