High severity7.5NVD Advisory· Published Aug 6, 2021· Updated Jun 17, 2026
CVE-2021-20594
CVE-2021-20594
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
11- cpe:2.3:o:mitsubishielectric:r08psfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r08sfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r120psfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r120sfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r16psfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r16sfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r32psfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r32sfcpu_firmware:*:*:*:*:*:*:*:*
- Mitsubishi Electric/MELSEC iQ-R series Safety CPU modulesdescription
- Range: <=11
- Range: <=26
Patches
Vulnerability mechanics
References
3- jvn.jp/vu/JVNVU98578731/index.htmlnvdThird Party Advisory
- www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-008_en.pdfnvdVendor Advisory
- www.cisa.gov/uscert/ics/advisories/icsa-21-250-01nvd
News mentions
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