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CVE-2021-20594 is an information disclosure vulnerability affecting Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08SFCPU, R16SFCPU, R32SFCPU, and R120SFCPU running firmware version 26 and earlier, and MELSEC iQ-R series SIL2 Process CPU modules R08PSFCPU, R16PSFCPU, R32PSFCPU, and R120PSFCPU running firmware version 11 and earlier. The flaw allows a remote unauthenticated attacker to determine legitimate usernames registered in the module by performing brute-force attempts against usernames. The issue is described as Exposure of Sensitive Information to an Unauthorized Actor and results in disclosure of valid account identifiers, which can facilitate subsequent attacks against the affected CPU modules.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.