CVE-2022-27456Network attack vector

Server crash via stale virtual-column expression

Published Apr 14, 2022 · Updated Aug 3, 2024

Use-after-free in affected MariaDB Server releases allows remote attackers to crash the server through virtual-column operations. When a cached table is reopened, VDec processes a stale virtual-column expression containing an item that was allocated outside the expression arena and freed prematurely. Triggering the fault requires SQL operations on a table whose virtual-column expression reaches the affected decimal conversion path, and the bounded consequence is a database-server crash.

CVSS severity7.5
High
EPSS probability2.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected MariaDB Server releases allows remote attackers to crash the server through virtual-column operations. When a cached table is reopened, VDec processes a stale virtual-column expression containing an item that was allocated outside the expression arena and freed prematurely. Triggering the fault requires SQL operations on a table whose virtual-column expression reaches the affected decimal conversion path, and the bounded consequence is a database-server crash.

The record

CVE
CVE-2022-27456
Published
Apr 14, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

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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