High severity · published Aug 6, 2021
CVE-2021-20594
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and…
7.5
CVSS
2.4%
EPSS
No
On KEV
Description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to acquire legitimate user names registered in the module via brute-force attack on user names.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.4% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RF
R08psfcpu Firmware · Mitsubishielectric
All versions, or not specified · source: NVD
RF
R08sfcpu Firmware · Mitsubishielectric
All versions, or not specified · source: NVD
RF
R120psfcpu Firmware · Mitsubishielectric
All versions, or not specified · source: NVD
RF
R120sfcpu Firmware · Mitsubishielectric
All versions, or not specified · source: NVD
RF
R16psfcpu Firmware · Mitsubishielectric
All versions, or not specified · source: NVD
RF
R16sfcpu Firmware · Mitsubishielectric
All versions, or not specified · source: NVD
RF
R32psfcpu Firmware · Mitsubishielectric
All versions, or not specified · source: NVD
RF
R32sfcpu Firmware · Mitsubishielectric
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-20594
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-20594
Third Party Advisory
https://jvn.jp/vu/JVNVU98578731/index.html
www.cisa.gov
https://www.cisa.gov/uscert/ics/advisories/icsa-21-250-01
Vendor Advisory
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-008_en.pdf
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