CVE-2026-51218
As of 2026-06-30, CVE-2026-51218 is a MEDIUM-severity vulnerability, CVSS v3.1 6.5. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-51218, most recently “AI-Powered Attacks Targeting Siemens S7 Series PLCs in U.S. Critical Infrastructure”.
Last updated: 2026-06-30
What is CVE-2026-51218?
A heap buffer overflow in the TS7Worker::PerformFunctionWrite() function (/core/s7_server.cpp) of snap7 v1.4.3 allows attackers to cause a Denial of Service (DoS) via a crafted packet.
The record classifies CVE-2026-51218 under weakness class CWE-122. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on availability. The identifier was first published 76 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.5 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 3.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-06-29, last modified 2026-06-30
Is CVE-2026-51218 being exploited?
It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.
Affected products and versions
No affected-product or package list has been recorded for CVE-2026-51218 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.
How to fix CVE-2026-51218
No vendor patch reference has been recorded for CVE-2026-51218 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-51218
1 tracked threat in the Threadlinqs corpus references CVE-2026-51218, either in the campaign’s CVE list or as an indicator on the campaign record.
- AI-Powered Attacks Targeting Siemens S7 Series PLCs in U.S. Critical Infrastructure — CRITICAL · 2026-08-19
Sources
Enriched from CVE.org. Last verified by Threadlinqs on .
Other references
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