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CVE-2025-40815 is a classic buffer overflow vulnerability affecting Siemens LOGO! 8 BM devices, including multiple LOGO! and SIPLUS LOGO! variants, in all versions. The flaw exists because the affected devices do not properly validate the structure of TCP packets in several methods. A remote attacker can send crafted TCP packets that trigger memory corruption, leading to a buffer overflow condition. Under successful exploitation, the attacker may gain control of the instruction counter and execute arbitrary code on the target device.
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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.
5 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.