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CVE-2025-40944 is a denial-of-service vulnerability affecting multiple Siemens SIMATIC and SIPLUS ET 200-series interface modules and PN coupler devices. The flaw is caused by improper handling of S7 protocol session disconnect requests. When an affected device receives a valid S7 protocol Disconnect Request in the form of a COTP DR TPDU over TCP port 102, it can transition into an improper session state. In that state, the device becomes unresponsive and does not recover automatically. The issue is associated with uncontrolled resource consumption or improper session-state handling during protocol disconnect processing.
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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.
10 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.