GoKawiilSecurity researcher finds remote code execution chain in Prusa MK4S firmware
An independent security researcher spent a week testing a Prusa MK4S 3D printer running firmware 6.5.7 and uncovered 14 distinct findings totaling roughly 23 defects, mostly in G-code parsing, Prusa Connect, and USB/FAT file handling. These bugs could be chained together to achieve remote code execution on the printer's main controller over the network. Prusa coordinated disclosure with the researcher and has patched all the issues in Buddy firmware versions above 7.0.0.
GoKawiil's interpretation of the reporting above, not reported fact.
The disclosure highlights that network-connected 3D printers, like other IoT devices, can expose users to serious remote exploitation risks if firmware input-handling isn't rigorously secured. The researcher's use of AI assistance (Opus 4.8) alongside fuzzing suggests such tools may be lowering the barrier for finding complex vulnerability chains even in unfamiliar domains like embedded firmware. CVE assignments are reportedly still pending, which could affect how quickly affected users become aware of the severity and apply the fix.
- Researcher found 14 vulnerabilities (about 23 defects) in Prusa MK4S firmware 6.5.7, chainable into remote code execution.
- Prusa has patched all identified issues in Buddy firmware versions above 7.0.0; users are urged to update immediately.
- Disclosure was coordinated between the researcher and Prusa, with CVE assignments still pending at publication.
Original Prusa MK4S 3D Printer — If you're following this deep dive into the MK4S firmware security research, it's worth knowing the printer itself remains a top-tier choice for makers, especially now that Prusa has patched these vulnerabilities in Buddy firmware. Owning one lets you actually apply the security updates discussed and keep your networked printer safe from RCE exploits like the ones detailed here.
See Original Prusa MK4S 3D Printer on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: dixken.de, 2026-11-08
Published there as: “Never Gonna Print You Up”
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