Loading vulnerability…
CVE-2021-20596 is a remotely exploitable NULL pointer dereference vulnerability in Mitsubishi Electric MELSEC-F Series Ethernet interface blocks, affecting FX3U-ENET, FX3U-ENET-L, and FX3U-ENET-P502 firmware version 1.14 and prior. An unauthenticated attacker can trigger the flaw by sending specially crafted packets to the affected Ethernet interface block. Successful exploitation causes a denial-of-service condition in communications with the product. The advisory states that PLC control by the MELSEC-F series itself is not affected, but recovery from the communication failure requires a system reset.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.