SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2021-20599

Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions "26" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU…

HIGH 7.5EPSS 1.40%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions "26" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.

CVSS 3.1
7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
1.40% probability · 71th percentile
CISA KEV
Not listed
Weakness
CWE-319, CWE-639
Affected
mitsubishielectric/r08sfcpu firmware · mitsubishielectric/r16sfcpu firmware · mitsubishielectric/r32sfcpu firmware · mitsubishielectric/r120sfcpu firmware · mitsubishielectric/r08psfcpu firmware · mitsubishielectric/r16psfcpu firmware · mitsubishielectric/r32psfcpu firmware · mitsubishielectric/r120psfcpu firmware
Source
Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.