CVE-2023-48704Network attack vector

Unauthenticated server crash via Gorilla decompression overflow

Published Dec 22, 2023 · Updated Aug 2, 2024

Heap buffer overflow in ClickHouse 23.3, 23.8, 23.9, and 23.10 release lines allows remote attackers to crash the server process. The Gorilla decoder trusts the encoded item count and writes beyond the destination buffer when malformed compressed data claims more output than the allocation holds. The native TCP interface exposes this path on port 9000 by default without authentication; successful exploitation terminates the server process and interrupts database service.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in ClickHouse 23.3, 23.8, 23.9, and 23.10 release lines allows remote attackers to crash the server process. The Gorilla decoder trusts the encoded item count and writes beyond the destination buffer when malformed compressed data claims more output than the allocation holds. The native TCP interface exposes this path on port 9000 by default without authentication; successful exploitation terminates the server process and interrupts database service.

The record

CVE
CVE-2023-48704
Published
Dec 22, 2023
Updated
Aug 2, 2024
Vendor
ClickHouse
Product
ClickHouse
Classifications
CWE-120, CWE-787, CWE-122, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 23.10.5.20
  2. Affected versionversion=< 23.3.18.15
  3. Affected versionversion=< 23.8.8.20
  4. Affected versionversion=< 23.9.2.47551
  5. Affected versionversion=< 23.9.6.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClickHouse · ClickHouseversion=< 23.10.5.20; version=< 23.3.18.15; version=< 23.8.8.20; version=< 23.9.2.47551; version=< 23.9.6.20

Published CVSS scores

7.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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