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Fencer Vulns
critical 9.2

CVE-2024-4009 json

Replay Attack in KNX Secure Devices

published 2024-06-05 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-32575

cvss
9.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

Replay Attack

in ABB, Busch-Jaeger, FTS Display (version 1.00) and BCU (version 1.3.0.33) allows attacker to capture/replay KNX telegram to local KNX Bus-System

Patch / fix

  • abb 2tma310010b0001_firmware 1.02
  • abb 2tma310011b0001_firmware 1.02
  • abb 2tma310011b0002_firmware 1.02
  • abb 2tma310010b0003_firmware 1.02
  • abb 2tma310011b0003_firmware 1.02

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
CNA 4.0 7.3 CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H/S:N/AU:N/V:D/RE:M/U:Green
CNA 4.0 7.3 CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:N/R:X/V:D/RE:M/U:Green
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • ABB, Busch-Jaeger 2.4! Display 55, SD/U12.55.11-825
  • ABB, Busch-Jaeger 2.4! Display 55, SD/SD/U12.55.1-825
  • ABB, Busch-Jaeger 2.4! Display 63, SD/U12.63.11-825
  • ABB, Busch-Jaeger RoomTouch 4", RT/U12.86.1-825
  • ABB, Busch-Jaeger RoomTouch 4", RT/U12.86.11-825
  • ABB, Busch-Jaeger 2,4'' Display 70, SD/U12.70.11-4015
  • ABB, Busch-Jaeger 2,4'' Display 70, SD-U12-70-1-4015
  • ABB, Busch-Jaeger RoomTouch 4", RT/U12.86.11-811
  • ABB, Busch-Jaeger RoomTouch 4", RT-U12-86-1-811
  • ABB, Busch-Jaeger BCU KNX, BA-U1.0.11
  • ABB, Busch-Jaeger BCU KNX, BA-U1.0.1
  • ABB, Busch-Jaeger BCU KNX, BA-U1.0.21

Classification

Weakness
  • CWE-294 Authentication Bypass by Capture-replay

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.