CVE-2023-29451
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 · uneditedSpecially crafted string can cause a buffer overrun in the JSON parser library leading to a crash of the Zabbix Server or a Zabbix Proxy.
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 · moderate confidenceA buffer overrun vulnerability exists in the Zabbix JSON parser library. By sending a specially crafted string to the Zabbix Server or Proxy, an attacker can trigger a buffer overflow that causes a crash, resulting in denial of service.
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<= 6.0.14>= 6.4.2, <= 6.4.4= 6.4.0CVSS 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
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 if Zabbix Server or Proxy is runningRun 'ps aux | grep zabbix' or check for zabbix_server/zabbix_proxy processesAffected if No Zabbix processes are running - not affected
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Determine installed Zabbix versionCheck via 'zabbix_server --version' or 'zabbix_proxy --version', or look in the Zabbix web interface under Administration > System InformationAffected if Version cannot be determined - assume potentially affected
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Compare installed version against affected rangesVersion <= 6.0.14, or version 6.4.0, or version >= 6.4.2 and <= 6.4.4 are affectedAffected if Installed version falls within: <= 6.0.14, = 6.4.0, >= 6.4.2 through <= 6.4.4 - environment is affected
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Confirm JSON parser is in useThe JSON parser is a core Zabbix component; verify Zabbix Server/Proxy is actively processing data (check logs or metrics collection)Affected if Zabbix is running and processing data - the vulnerable code path is active
Your environment is affected if Zabbix Server or Proxy is running a version in the range <= 6.0.14, = 6.4.0, or >= 6.4.2 through <= 6.4.4.
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.
dbcve · scopedApply the vendor-provided security patch for CVE-2023-29451. If patching is immediately infeasible, restrict network access to Zabbix Server/Proxy interfaces and implement input validation at network perimeter devices.
Zabbix 6.0.15+ or 6.4.5+ (or latest stable 6.4.x/7.0.x)
- 1. Identify your current Zabbix installation version by checking the Zabbix Server or Proxy version
- 2. For Zabbix 6.0.x installations: Upgrade to version 6.0.15 or later
- 3. For Zabbix 6.4.x installations: Upgrade to version 6.4.5 or later
- 4. Alternatively, upgrade to the latest stable Zabbix release (6.4.x or 7.0.x) which contains the security fix
- 5. After upgrading, restart the Zabbix Server and/or Zabbix Proxy services to apply the changes
- 6. Verify the Zabbix services are running properly and monitor for any issues
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,096.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-29451 — 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-2023-29451 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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