CVE-2021-27195
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 · uneditedImproper Authorization vulnerability in Netop Vision Pro up to and including to 9.7.1 allows an attacker to replay network traffic.
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 confidenceNetop Vision Pro up to version 9.7.1 contains an improper authorization vulnerability that allows attackers to replay captured network traffic. This indicates a lack of proper session validation, cryptographic nonces, or timestamp verification in the authentication or data transmission mechanism.
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<= 9.7.1CVSS 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
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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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Verify Netop Vision Pro is installedCheck if Netop Vision Pro application exists on the system by looking for the program in installed applications or searching for Netop Vision Pro files in Program Files directoriesAffected if Netop Vision Pro is present on the system and version is 9.7.1 or lower
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Determine installed versionAccess the application or its documentation to identify the exact version number. Compare against the affected range: any version up to and including 9.7.1Affected if Installed version is 9.7.1 or any earlier version (e.g., 9.7.0, 9.6.x, etc.)
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Check if network service is activeDetermine whether the Netop Vision Pro network service or server component is running and accepting connectionsAffected if Network service is enabled and accepting connections, exposing the replay vulnerability
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Inspect network traffic handlingReview application configuration or documentation to confirm whether authentication sessions use cryptographic nonces, timestamps, or sequence numbersAffected if Authentication mechanism lacks proper session validation, nonces, or timestamp verification
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Analyze logs for unusual repeated requestsExamine application or system logs for patterns indicating repeated authentication attempts or data replayAffected if Logs show duplicate or replayed network requests without proper validation
A user is affected if Netop Vision Pro version 9.7.1 or lower is installed with the network service enabled and the authentication mechanism lacks replay protection mechanisms.
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 dataImplement anti-replay protections including unique session tokens, timestamps, or sequence numbers; ensure proper authorization validation on all network requests to prevent reuse of captured credentials or data.
- Consultation4.0 h
- Implementation12.0 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 $7,040.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27195 — 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-2021-27195 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
- No spam, self-promotion, credentials, or personal data