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CVE-2021-20598 is an overly restrictive account lockout mechanism vulnerability affecting Mitsubishi Electric MELSEC iQ-R series Safety CPU modules (R08SFCPU, R16SFCPU, R32SFCPU, R120SFCPU) and SIL2 Process CPU modules (R08PSFCPU, R16PSFCPU, R32PSFCPU, R120PSFCPU). The flaw allows a remote unauthenticated attacker to trigger account lockout for a legitimate user by repeatedly attempting authentication with a known username and incorrect passwords. According to the provided advisory context, the affected models are vulnerable in all versions. The issue results in denial of access to legitimate users rather than direct code execution or credential disclosure.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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.