CVE-2026-55732 PUBLISHED

Loytec LINX firmware: Out-of-bounds Read in BACnet packet parsing (bacdt_datetime_to_tod)

Assigner: NCSC.ch
Reserved: 17.06.2026 Published: 24.07.2026 Updated: 24.07.2026

Out-of-bounds Read (CWE-125) in BACnet packet parsing (bacdt_datetime_to_tod) in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.18 on LINX-A64 allows an unauthenticated remote attacker to crash linx_a64.exe and ultimately reboot the device via a malformed BACnet TimeSynchronization or UTC-TimeSynchronization packet with an invalid month value. The same vulnerability affects multiple other Loytec products.

Metrics

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

Product Status

Vendor Loytec
Product LIP-ME20xC
Versions Default: unaffected
  • affected from 0 to 8.4.18 (incl.)
Vendor Loytec
Product L-INX
Versions Default: unaffected
  • affected from 0 to 8.4.18 (incl.)
Vendor Loytec
Product L-GATE
Versions Default: unaffected
  • affected from 0 to 8.4.18 (incl.)
Vendor Loytec
Product L-ROC
Versions Default: unaffected
  • affected from 0 to 8.4.18 (incl.)
Vendor Loytec
Product L-IOB
Versions Default: unaffected
  • affected from 0 to 8.4.18 (incl.)
Vendor Loytec
Product L-DALI
Versions Default: unaffected
  • affected from 0 to 8.4.18 (incl.)
Vendor Loytec
Product L-VIS
Versions Default: unaffected
  • affected from 0 to 8.4.18 (incl.)
Vendor Loytec
Product L-PAD
Versions Default: unaffected
  • affected from 0 to 8.4.18 (incl.)

Solutions

Upgrade to firmware version 8.4.20.

Credits

  • Daniel Hulliger, armasuisse CYD Campus finder
  • Damian Pfammatter, armasuisse CYD Campus finder

References

Problem Types

  • CWE-125 Out-of-bounds read CWE

Impacts

  • CAPEC-540 Overread Buffers