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MariaDBDatabase / datastore

CVE-2022-27447

HIGH · 7.5 CVSS v3.1 Published 2022-04-14
Fix available
A fix is available. Upgrade to 10.3.35 / 10.4.25 or later.
See remediation →
84/100
Remediation priority · High
Public exploit Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
MariaDB Server v10.9 and below was discovered to contain a use-after-free via the component Binary_string::free_buffer() at /sql/sql_string.h.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-416

Memory is used after it has been freed, so its contents — now potentially attacker-controlled — drive the program's behaviour. With careful heap grooming this becomes code execution. The fix requires disciplined ownership of memory and often a targeted rework of the object lifecycle.

General guidance for the use after free class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
MariaDBDatabase / datastore
Affected:>= 10.3.0, < 10.3.35>= 10.4.0, < 10.4.25>= 10.5.0, < 10.5.16>= 10.6.0, < 10.6.8>= 10.7.0, < 10.7.4
Debian LinuxOperating system
Affected:= 10.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 10.3.35 / 10.4.25 / 10.5.16 or later
Fixed in 10.3.3510.4.2510.5.16
Recommended fix High confidence

Upgrade to 10.3.35+/10.4.25+/10.5.16+/10.6.8+ depending on your current major version branch - prefer latest in your current branch

  1. 1. Back up all MariaDB databases using mysqldump or mariadb-backup
  2. 2. Stop the MariaDB service (e.g., systemctl stop mariadb or systemctl stop mysql)
  3. 3. Update your package repository to get the latest MariaDB packages
  4. 4. Install the updated MariaDB package for your version: apt-get update && apt-get install mariadb-server (Debian) or yum update mariadb-server (RHEL/CentOS)
  5. 5. Start the MariaDB service (e.g., systemctl start mariadb or systemctl start mysql)
  6. 6. Run mysql_upgrade to migrate system tables to the new version
  7. 7. Verify the MariaDB version matches the fixed release (e.g., SELECT VERSION();)
Caveat Major version upgrades may require migration steps; always test on staging first; review MariaDB upgrade notes for compatibility changes

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,200. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-27447 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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