CVE-2022-28936
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 · uneditedFISCO-BCOS release-3.0.0-rc2 was discovered to contain an issue where a malicious node can trigger an integer overflow and cause a Denial of Service (DoS) via an unusually large viewchange message packet.
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 confidenceFISCO-BCOS release-3.0.0-rc2 contains an integer overflow vulnerability in its viewchange message handling logic. A malicious node can send an unusually large viewchange message packet that triggers the overflow, causing the node to crash and resulting in a 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= 3.0.0CVSS 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 FISCO-BCOS installation versionLocate the FISCO-BCOS binaries or check the version flag (commonly --version or -v), or examine the build metadata in the installation directoryAffected if The installed version is 3.0.0 or release-3.0.0-rc2
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Locate viewchange handler configurationSearch for configuration files related to PBFT or consensus module, where viewchange message processing is definedAffected if Viewchange handling is enabled in the consensus configuration (PBFT consensus typically uses viewchange messages)
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Verify node is participating in consensusCheck if the node is running with consensus participation enabled - examine logs or network status for active consensus roleAffected if The node is an active consensus participant processing viewchange messages
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Inspect viewchange message size limitsReview the configuration for maximum viewchange message size or packet length limits in the PBFT/consensus settingsAffected if No explicit maximum size limit is configured for viewchange messages, or limits are set to allow unusually large messages (beyond typical protocol specifications)
A node is affected if it runs FISCO-BCOS version 3.0.0 with consensus/viewchange processing enabled and lacks proper bounds checking on incoming viewchange message sizes.
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 dataUpgrade to a patched version of FISCO-BCOS that properly validates message sizes and implements bounds checking on integer operations in the viewchange handler. Network segmentation and monitoring for anomalous large viewchange messages can provide temporary workarounds.
- Consultation3.0 h
- Implementation6.0 h
- Testing5.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-28936 — 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-2022-28936 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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