CVE-2023-31621Public exploitNetwork attack vector

Remote denial of service via kc_var_col crash

Published May 15, 2023 · Updated Jan 24, 2025

Denial of service in the kc_var_col component of openlink virtuoso-opensource 7.2.9 allows remote attackers to interrupt service via crafted SQL statements. The kc_var_col routine crashes while processing rows during an UPDATE that follows schema alteration, as demonstrated by the upstream reproducer and backtrace. Network access to the SQL interface is required; the published assessment reports no confidentiality or integrity impact, only database availability interruption.

CVSS severity7.5
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the kc_var_col component of openlink virtuoso-opensource 7.2.9 allows remote attackers to interrupt service via crafted SQL statements. The kc_var_col routine crashes while processing rows during an UPDATE that follows schema alteration, as demonstrated by the upstream reproducer and backtrace. Network access to the SQL interface is required; the published assessment reports no confidentiality or integrity impact, only database availability interruption.

The record

CVE
CVE-2023-31621
Published
May 15, 2023
Updated
Jan 24, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 24, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA ADP VulnrichmentCVSS: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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1499Endpoint Denial of Service

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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