CVE-2026-120596 Ethernut Nut/OS - Denial of Service

Ethernut Nut/OS <= 5.1 contains a denial-of-service caused by a malformed TCP option with zero length in NutTcpInputOptions, letting unauthenticated remote attackers block TCP services, exploit requires sending crafted TCP segment.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2 November 2026
Updated
3 November 2026
Weakness
CWE-835

Vendor fix

Update to the latest version beyond 5.1.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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