CVE-2026-111734 PUBLISHED

Missing length validation of EtherType, VLAN and FrameID fields in pf_eth_recv()

Assigner: rt-labs
Reserved: 16.10.2026 Published: 29.10.2026 Updated: 29.10.2026

P-Net before 1.0.3 does not validate the length of a received Ethernet frame in pf_eth_recv() before reading the EtherType, any VLAN tags and the PROFINET FrameID. The VLAN tag loop had no upper bound, so a truncated frame, or a frame consisting only of VLAN tags, makes the function read past the end of the receive buffer. This can cause a crash (denial of service) or disclose memory content.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 7.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	Low	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	RT-Labs
Product	P-Net
Versions	Default: unaffected affected from 0 to 1.0.3 (excl.)

Solutions

Upgrade to P-Net 1.0.3 or later.

Credits

router0mail finder

References

Cybersecurity advisory for P-Net

Problem Types

CWE-125 Out-of-bounds Read CWE