CVE-2021-45035
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 · uneditedVelneo vClient on its 28.1.3 version, does not correctly check the certificate of authenticity by default. This could allow an attacker that has access to the network to perform a MITM attack in order to obtain the user´s credentials.
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 confidenceVelneo vClient version 28.1.3 fails to properly validate SSL/TLS server certificates by default, allowing an attacker on the same network to intercept communications and capture user credentials through a man-in-the-middle attack.
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= 28.1.3CVSS 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
- None
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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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Verify Velneo vClient versionOpen Velneo vClient, go to Help > About, or check the installed program's version property. On Windows, right-click the executable and view Properties > Details > File Version.Affected if The installed version is exactly 28.1.3 (no other versions are affected per the CVE)
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Inspect vClient SSL/TLS configurationLook for vClient configuration files or settings related to SSL/TLS certificate validation. Check for options like 'Validate certificates', 'Verify SSL', or similar settings in the vClient setup or preference files.Affected if Certificate validation is disabled or set to 'No' in the configuration
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Examine network traffic for certificate issuesUse a network sniffer (such as Wireshark) to capture traffic between vClient and the server. Look for TLS handshake messages and check if certificate validation errors occur or if certificates are being accepted without verification.Affected if The client accepts connections without validating the server certificate or shows certificate verification errors in the traffic
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Check for MITM exposure indicatorsReview application logs or event logs for SSL/TLS errors, certificate warnings, or connection anomalies that might indicate improper certificate handling.Affected if Logs show certificates being accepted without proper validation or no certificate checks are performed
If Velneo vClient version 28.1.3 is installed and SSL/TLS certificate validation is not explicitly enabled in the configuration, the environment is vulnerable to man-in-the-middle attacks.
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 dataEnable proper certificate validation in vClient configuration or ensure the application verifies server certificates before accepting connections; additionally, use trusted networks or VPNs to reduce exposure to network-based MITM attacks.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-45035 — 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-2021-45035 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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