CVE-2023-47118

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time. A heap buffer overflow issue was discovered in ClickHouse server. An attacker could send a specially crafted payload to the native interface exposed by default on port 9000/tcp, triggering a bug in the decompression logic of T64 codec that crashes the ClickHouse server process. This attack does not require authentication. Note that this exploit can also be triggered via HTTP protocol, however, the attacker will need a valid credential as the HTTP authentication take places first. This issue has been fixed in version 23.10.2.13-stable, 23.9.4.11-stable, 23.8.6.16-lts and 23.3.16.7-lts.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
37.5%
KEV
Not listed

Published

December 20, 2023

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Jun 27, 2026
Patch available. Sources: github.
github Patch Available

Heap buffer overflow in T64 codec decompression · Advisory · ClickHouse/ClickHouse · GitHub

https://github.com/ClickHouse/ClickHouse/security/advisories/GHSA-g22g-p6q2-x39v

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 49× 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 106 total refreshes for this CVE.

  1. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 02:27 UTCEG score recompute
  3. 2026-07-22 23:14 UTCEG score recompute▲ 2.80
  4. 2026-07-22 14:06 UTCEPSS rescore
  5. 2026-07-21 15:23 UTCEPSS rescore
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  7. 2026-07-20 17:06 UTCEPSS rescore
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  18. 2026-07-15 00:40 UTCOSV refresh
  19. 2026-07-13 22:28 UTCEPSS rescore
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  25. 2026-07-09 19:08 UTCEPSS rescore
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  1. 2026-07-08 15:13 UTCEPSS rescore
  2. 2026-07-07 13:44 UTCEPSS rescore
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  4. 2026-07-06 16:26 UTCEPSS rescore
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  18. 2026-06-27 03:07 UTCEPSS rescore
  19. 2026-06-27 01:37 UTCOSV refresh
  20. 2026-06-25 13:48 UTCEPSS rescore
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  22. 2026-06-24 14:04 UTCEPSS rescore
  23. 2026-06-24 14:04 UTCEPSS rescore
  24. 2026-06-24 06:35 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  25. 2026-06-23 21:31 UTCEPSS rescore
  26. 2026-06-23 21:31 UTCEPSS rescore
  27. 2026-06-22 14:24 UTCEPSS rescore
  28. 2026-06-22 14:24 UTCEPSS rescore
  29. 2026-06-21 14:55 UTCEPSS rescore
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  31. 2026-06-21 01:58 UTCEPSS rescore
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  35. 2026-06-18 17:51 UTCEPSS rescore
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  39. 2026-06-15 17:47 UTCEPSS rescore
  40. 2026-06-14 23:16 UTCEPSS rescore
  41. 2026-06-13 22:59 UTCEPSS rescore
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  43. 2026-06-12 23:11 UTCEPSS rescore
  44. 2026-06-12 23:10 UTCEPSS rescore
  45. 2026-06-11 13:59 UTCEPSS rescore
  46. 2026-06-10 22:17 UTCEPSS rescore
  47. 2026-06-10 13:21 UTCEPSS rescore
  48. 2026-06-09 11:30 UTCOSV refresh
  49. 2026-06-08 14:16 UTCEPSS rescore
  50. 2026-06-08 14:16 UTCEPSS rescore
  51. 2026-06-07 15:24 UTCEPSS rescore
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  53. 2026-06-06 13:46 UTCEPSS rescore
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  71. 2026-05-29 13:43 UTCEPSS rescore
  72. 2026-05-28 13:44 UTCEPSS rescore
  73. 2026-05-27 13:39 UTCEPSS rescore
  74. 2026-05-27 13:39 UTCEPSS rescore
  75. 2026-05-26 13:43 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-47118?
CVE-2023-47118 is a critical vulnerability published on December 20, 2023. ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time. A heap buffer overflow issue was discovered in ClickHouse server. An attacker could send a specially crafted payload to the native interface exposed by default on…
When was CVE-2023-47118 disclosed?
CVE-2023-47118 was first published in the National Vulnerability Database on December 20, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-47118 actively exploited?
CVE-2023-47118 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-47118?
CVE-2023-47118 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-47118?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-47118, 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.

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