CVE-2023-4346

CRITICALNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-07-15), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — KEV-added this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 7.5Exploit: cisa kev · ssvc activeExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

KNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way.

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
56%
KEV
⚠ Exploited

Published

August 29, 2023

Last Modified

July 16, 2026

Advisory Details (1)

Auto-updated Jul 15, 2026
Patch available. Sources: cisa.
cisa Patch Available

KNX Protocol | CISA

https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01

Vendor Advisories for CVE-2023-4346(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 42× in last 7d / 110× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 169 total refreshes for this CVE.

  1. 2026-07-27 02:44 UTCGHSA enrichment
  2. 2026-07-26 22:36 UTCGHSA enrichment
  3. 2026-07-26 18:29 UTCEG score recompute
  4. 2026-07-26 18:29 UTCGHSA enrichment
  5. 2026-07-26 14:52 UTCEPSS rescore
  6. 2026-07-26 14:22 UTCEG score recompute
  7. 2026-07-26 14:22 UTCGHSA enrichment
  8. 2026-07-26 10:14 UTCGHSA enrichment
  9. 2026-07-26 06:05 UTCGHSA enrichment
  10. 2026-07-26 01:56 UTCEG score recompute
  11. 2026-07-26 01:56 UTCGHSA enrichment
  12. 2026-07-25 14:16 UTCEPSS rescore
  13. 2026-07-24 14:16 UTCEPSS rescore
  14. 2026-07-24 14:16 UTCEPSS rescore
  15. 2026-07-23 14:16 UTCEPSS rescore
  16. 2026-07-23 02:26 UTCEG score recompute
  17. 2026-07-22 21:54 UTCEG score recompute
  18. 2026-07-22 21:53 UTCGHSA enrichment
  19. 2026-07-22 19:40 UTCCISA KEV update
  20. 2026-07-22 17:46 UTCEG score recompute
  21. 2026-07-22 17:46 UTCGHSA enrichment
  22. 2026-07-22 14:06 UTCEPSS rescore
  23. 2026-07-22 13:38 UTCGHSA enrichment
  24. 2026-07-22 09:31 UTCGHSA enrichment
  25. 2026-07-22 05:24 UTCGHSA enrichment
Show 75 more
  1. 2026-07-22 01:17 UTCGHSA enrichment
  2. 2026-07-21 21:10 UTCGHSA enrichment
  3. 2026-07-21 17:02 UTCEG score recompute
  4. 2026-07-21 17:02 UTCGHSA enrichment
  5. 2026-07-21 15:23 UTCEPSS rescore
  6. 2026-07-21 15:23 UTCEPSS rescore
  7. 2026-07-21 14:37 UTCCISA KEV update
  8. 2026-07-21 12:55 UTCGHSA enrichment
  9. 2026-07-21 08:48 UTCGHSA enrichment
  10. 2026-07-21 04:41 UTCGHSA enrichment
  11. 2026-07-21 00:33 UTCGHSA enrichment
  12. 2026-07-20 20:27 UTCEG score recompute
  13. 2026-07-20 20:27 UTCGHSA enrichment
  14. 2026-07-20 17:06 UTCEPSS rescore
  15. 2026-07-20 16:19 UTCGHSA enrichment
  16. 2026-07-20 12:11 UTCGHSA enrichment
  17. 2026-07-20 08:03 UTCGHSA enrichment
  18. 2026-07-20 03:56 UTCGHSA enrichment
  19. 2026-07-19 23:48 UTCGHSA enrichment
  20. 2026-07-19 19:42 UTCGHSA enrichment
  21. 2026-07-19 15:35 UTCEG score recompute
  22. 2026-07-19 15:35 UTCGHSA enrichment
  23. 2026-07-19 14:29 UTCEPSS rescore
  24. 2026-07-19 14:29 UTCEPSS rescore
  25. 2026-07-19 11:28 UTCGHSA enrichment
  26. 2026-07-19 07:21 UTCGHSA enrichment
  27. 2026-07-19 03:14 UTCEG score recompute
  28. 2026-07-19 03:14 UTCGHSA enrichment
  29. 2026-07-19 02:27 UTCEPSS rescore
  30. 2026-07-18 23:06 UTCGHSA enrichment
  31. 2026-07-18 18:59 UTCGHSA enrichment
  32. 2026-07-18 14:52 UTCGHSA enrichment
  33. 2026-07-18 10:45 UTCEG score recompute
  34. 2026-07-18 10:45 UTCGHSA enrichment
  35. 2026-07-18 10:03 UTCEPSS rescore
  36. 2026-07-18 10:03 UTCEPSS rescore
  37. 2026-07-18 06:38 UTCGHSA enrichment
  38. 2026-07-18 02:31 UTCGHSA enrichment
  39. 2026-07-17 22:24 UTCGHSA enrichment
  40. 2026-07-17 18:16 UTCGHSA enrichment
  41. 2026-07-17 14:09 UTCGHSA enrichment
  42. 2026-07-17 10:02 UTCEG score recompute
  43. 2026-07-17 10:02 UTCGHSA enrichment
  44. 2026-07-17 05:54 UTCGHSA enrichment
  45. 2026-07-17 01:47 UTCGHSA enrichment
  46. 2026-07-16 21:40 UTCGHSA enrichment
  47. 2026-07-16 17:33 UTCGHSA enrichment
  48. 2026-07-16 17:04 UTCCISA KEV update
  49. 2026-07-16 17:01 UTCEPSS rescore
  50. 2026-07-16 13:26 UTCGHSA enrichment
  51. 2026-07-16 09:18 UTCGHSA enrichment
  52. 2026-07-16 05:11 UTCGHSA enrichment
  53. 2026-07-16 01:04 UTCGHSA enrichment
  54. 2026-07-15 20:57 UTCGHSA enrichment
  55. 2026-07-15 16:56 UTCEPSS rescore
  56. 2026-07-15 16:56 UTCEPSS rescore
  57. 2026-07-15 16:50 UTCEG score recompute▲ 1.50
  58. 2026-07-15 16:50 UTCGHSA enrichment
  59. 2026-07-15 16:49 UTCCISA KEV update
  60. 2026-07-15 01:59 UTCEPSS rescore
  61. 2026-07-15 01:59 UTCEPSS rescore
  62. 2026-07-13 22:28 UTCEPSS rescore
  63. 2026-07-13 22:28 UTCEPSS rescore
  64. 2026-07-13 06:11 UTCEPSS rescore
  65. 2026-07-13 06:11 UTCEPSS rescore
  66. 2026-07-12 05:45 UTCEPSS rescore
  67. 2026-07-11 08:26 UTCEPSS rescore
  68. 2026-07-09 19:08 UTCEPSS rescore
  69. 2026-07-08 15:13 UTCEPSS rescore
  70. 2026-07-07 13:44 UTCEPSS rescore
  71. 2026-07-07 13:44 UTCEPSS rescore
  72. 2026-07-06 16:26 UTCEPSS rescore
  73. 2026-07-06 16:26 UTCEPSS rescore
  74. 2026-07-06 02:22 UTCEPSS rescore
  75. 2026-07-05 02:29 UTCEPSS rescore

Frequently asked(6)

What is CVE-2023-4346?
CVE-2023-4346 is a critical vulnerability published on August 29, 2023. KNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this…
When was CVE-2023-4346 disclosed?
CVE-2023-4346 was first published in the National Vulnerability Database on August 29, 2023, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-4346 actively exploited?
Yes. CISA added CVE-2023-4346 to the Known Exploited Vulnerabilities catalog on July 15, 2026, affecting KNX Association KNX Protocol Connection Authorization Option 1. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-4346?
CVE-2023-4346 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2023-4346?
CVE-2023-4346 affects KNX Association KNX Protocol Connection Authorization Option 1. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2023-4346?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-4346, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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