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CVE-2021-20597 is an insufficiently protected credentials 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. When user information is registered on the target over the network, or when a password is changed over the network, credentials can be exposed to a network observer. A remote unauthenticated attacker who can sniff the relevant network traffic can obtain those credentials and then use them to log in to the target system without authorization.
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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.