CVE-2022-43765
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 · uneditedB&R APROL versions < R 4.2-07 doesn’t process correctly specially formatted data packages sent to port 55502/tcp, which may allow a network based attacker to cause an application Denial-of-Service.
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 confidenceB&R APROL versions prior to R 4.2-07 contain a vulnerability in the data packet processing logic for port 55502/tcp. Specially crafted data packages sent to this port can trigger a parsing error causing the application to become unresponsive, resulting in a Denial-of-Service condition.
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< r4.2-07CVSS 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 B&R APROL is installedCheck system inventory, installed software list, or look for APROL-specific directories or services on the hostAffected if B&R APROL software is present on the system
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Determine the installed APROL versionUse the system's software management tools or check APROL-specific version information to identify the exact version numberAffected if The installed version is prior to R 4.2-07 (e.g., R 4.2-06, R 4.2, R 4.1, etc.)
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Verify if port 55502/tcp is listeningRun a network scan or use netstat/ss commands to check if port 55502 is open and listening on the affected systemAffected if Port 55502/tcp is open and accepting connections
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Assess network accessibility of port 55502Check firewall rules, network segmentation, or ACLs to determine if port 55502 is reachable from untrusted network segmentsAffected if Port 55502/tcp is exposed to untrusted or external network sources
The environment is affected if B&R APROL with a version prior to R 4.2-07 is installed and port 55502/tcp is accessible on the network.
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 · scopedUpgrade B&R APROL to version R 4.2-07 or later to patch the vulnerable packet processing code. If immediate patching is not feasible, consider network segmentation to restrict access to port 55502/tcp to trusted sources only.
APROL R 4.2-07 or later
- 1. Identify all B&R APROL installations in the environment that are running versions prior to R 4.2-07
- 2. Schedule a maintenance window for the upgrade process
- 3. Back up the current APROL configuration and any relevant data
- 4. Obtain the APROL R 4.2-07 or later version from B&R Automation's official channels
- 5. Apply the upgrade following B&R's documented upgrade procedure for APROL
- 6. Verify the upgrade was successful and the service is running normally
- 7. Confirm port 55502/tcp is now properly handling specially formatted data packages without causing denial-of-service
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-43765 — 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-2022-43765 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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