CVE-2021-46667Public exploit

Database server crash via undersized reference array

Published Feb 1, 2022 · Updated Aug 4, 2024

Integer overflow in sql_lex.cc in MariaDB Server before 10.6.5 allows local users to crash the database server via a crafted query. The st_select_lex::setup_ref_array function stores the sum of several item counts and its fivefold array size in an unsigned integer, allowing wraparound and an invalid ref_pointer_array allocation. A low-privileged user who can submit the triggering SQL can terminate the server process, interrupting database availability without disclosing or altering data.

CVSS severity5.5
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in sql_lex.cc in MariaDB Server before 10.6.5 allows local users to crash the database server via a crafted query. The st_select_lex::setup_ref_array function stores the sum of several item counts and its fivefold array size in an unsigned integer, allowing wraparound and an invalid ref_pointer_array allocation. A low-privileged user who can submit the triggering SQL can terminate the server process, interrupting database availability without disclosing or altering data.

The record

CVE
CVE-2021-46667
Published
Feb 1, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.1NIST National Vulnerability DatabaseAV:L/AC:L/Au:N/C:N/I:N/A:P
7.5SUSECVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application 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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