CVE-2023-4537
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 · uneditedComarch ERP XL client is vulnerable to MS SQL protocol downgrade request from a server side, what could lead to an unencrypted communication vulnerable to data interception and modification. This issue affects ERP XL: from 2020.2.2 through 2023.2.
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 confidenceThe Comarch ERP XL client accepts MS SQL protocol downgrade requests from the server side, allowing a malicious or compromised server to force unencrypted database communication. This exposes sensitive data to interception and modification via man-in-the-middle attacks.
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>= 2020.2.2, <= 2023.2CVSS 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
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
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 Comarch ERP XL is installedCheck for Comarch ERP XL installation directories (commonly in Program Files or Program Files (x86) with 'Comarch' in the name) or look for Comarch ERP XL entries in Add/Remove Programs (Windows) or installed applications list.Affected if Comarch ERP XL client software is found on the system
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Determine the installed version of Comarch ERP XLCheck the application's About dialog, version information in the executable properties, or look for version files in the installation directory. The version typically follows the format X.Y.Z (e.g., 2020.2.2, 2023.2).Affected if The installed version falls within >= 2020.2.2 and <= 2023.2
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Inspect SQL connection configuration filesLook for configuration files in the Comarch ERP XL installation directory that define database connection settings (commonly XML, INI, or config files). Search for connection strings or SQL-related settings.Affected if Connection configuration allows unencrypted SQL connections or does not explicitly require encryption
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Verify SQL encryption settings in client configurationExamine the database connection parameters for 'Encrypt', 'TrustServerCertificate', or similar encryption-related flags. Check if the client is configured to accept server-specified protocol settings.Affected if The client configuration does not enforce encryption or accepts protocol downgrade from the server
You are affected if Comarch ERP XL version 2020.2.2 through 2023.2 is installed and the SQL client connection configuration allows unencrypted communication or accepts server-initiated protocol downgrade.
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 Comarch ERP XL to a version beyond 2023.2 as per vendor advisory, or implement network-level encryption such as VPN to protect SQL communications from protocol downgrade attacks.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-4537 — 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-2023-4537 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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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.
- 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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