CVE-2021-2429
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 · uneditedVulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are 8.0.25 and prior. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A: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 · high confidenceA denial-of-service vulnerability in the InnoDB storage engine of MySQL Server 8.0.25 and prior allows unauthenticated remote attackers to cause server hangs or repeatable crashes via network access. The vulnerability is rated 'difficult to exploit' but requires no authentication.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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>= 8.0.0, <= 8.0.25all versionsCVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify MySQL Server versionRun 'mysql --version' from command line or execute 'SELECT VERSION();' via a mysql client connectionAffected if Version returned is between 8.0.0 and 8.0.25 inclusive
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Verify InnoDB storage engine is activeExecute 'SHOW ENGINE INNODB STATUS;' via mysql client. InnoDB is enabled by default in MySQL 8.0Affected if Command returns status information (engine is active) - the vulnerability exists in the InnoDB component specifically
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Confirm network exposure of MySQL serviceRun 'netstat -tlnp | grep 3306' or 'ss -tlnp | grep 3306' to see if MySQL is listening on external interfaces. Check if port 3306 is bound to 0.0.0.0 or :: rather than 127.0.0.1Affected if MySQL is listening on a non-localhost interface (0.0.0.0 or ::) making it network-accessible
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Check for NetApp OnCommand Insight installationVerify if NetApp OnCommand Insight software is installed on the system - check installed programs or product documentationAffected if OnCommand Insight is installed (all versions are affected per vendor advisory)
You are affected if running MySQL Server version 8.0.0 through 8.0.25 with InnoDB enabled and network-accessible ports, or if NetApp OnCommand Insight is installed.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataUpdate MySQL Server to a version beyond 8.0.25 (patched in Oracle's July 2021 Critical Patch Update). If immediate patching is not possible, restrict network exposure of MySQL ports and monitor for unusual connection patterns.
- Consultation3.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-2429 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-2429 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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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