CVE-2024-33809Public exploitNetwork attack vector

Connection crash via hash-join row indexing

Published May 24, 2024 · Updated Mar 13, 2025

Buffer overflow in PingCAP TiDB Server 7.5.0 and earlier allows remote authenticated users to crash their database connection via crafted SQL. During a crafted hash join, probeWorker calls Chunk.AppendRowByColIdxs along a path that lets appendCellByCell access column index 431 in a one-cell row. Database access is required; the panic ends only the initiating connection, which can reconnect, without interrupting other users or the server.

CVSS severity6.5
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in PingCAP TiDB Server 7.5.0 and earlier allows remote authenticated users to crash their database connection via crafted SQL. During a crafted hash join, probeWorker calls Chunk.AppendRowByColIdxs along a path that lets appendCellByCell access column index 431 in a one-cell row. Database access is required; the panic ends only the initiating connection, which can reconnect, without interrupting other users or the server.

The record

CVE
CVE-2024-33809
Published
May 24, 2024
Updated
Mar 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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