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 — 4 sources updated 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
68%
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 58× in last 7d / 248× 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 533 total refreshes for this CVE.

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

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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