CVE-2026-35225 PUBLISHED

Improper timeout handling in CODESYS EtherNetIP

Assigner: CERTVDE
Reserved: 01.04.2026 Published: 23.04.2026 Updated: 23.04.2026

An unauthenticated remote attacker is able to exhaust all available TCP connections in the CODESYS EtherNet/IP adapter stack, preventing legitimate clients from establishing new connections.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	CODESYS
Product	CODESYS EtherNetIP
Versions	Default: unaffected affected from 1.0.0.0 to 4.9.0.0 (excl.)

Credits

ABB reporter

References

https://codesys.csaf-tp.certvde.com/.well-known/csaf/white/2026/advisory2026-04_vde-2026-040.json
https://www.certvde.com/en/advisories/VDE-2026-040/

Problem Types

CWE-754 Improper Check for Unusual or Exceptional Conditions CWE