CVE-2021-27509
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 · uneditedIn Visualware MyConnection Server before 11.0b build 5382, each published report is not associated with its own access code.
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 confidenceIn Visualware MyConnection Server before 11.0b build 5382, each published report is not associated with its own access code. This is an authorization bypass vulnerability where reports can be accessed without proper individual access control, potentially allowing unauthorized users to view sensitive report data by simply knowing or guessing the report URL.
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<= 11.0b= 11.0bCVSS 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
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/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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Determine installed MyConnection Server versionLocate the version information for your MyConnection Server installation (typically accessible via the admin interface, a version file, or server headers). Identify both the release version (e.g., 11.0b) and the build number.Affected if The installed version is 11.0b with build number less than 5382, or any version earlier than 11.0b.
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Confirm report publishing is enabledCheck whether the report publishing feature is configured and active on your MyConnection Server instance. This is typically found in the admin settings or server configuration.Affected if Report publishing is enabled and being used to generate published reports accessible via URL.
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Verify report access control mechanismExamine how published reports are accessed - check if each published report has a unique individual access code associated with it, rather than relying on a shared or global access method.Affected if Published reports can be accessed through predictable or guessable URLs without requiring a unique per-report access code.
Your environment is affected if you are running MyConnection Server version 11.0b with build lower than 5382 (or any version before 11.0b) AND the report publishing feature is enabled, allowing reports to be accessed without unique per-report access codes.
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 MyConnection Server 11.0b build 5382 or later which implements per-report access codes. If immediate upgrade is not possible, restrict network access to the report publishing endpoints as a temporary compensating control.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27509 — 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-2021-27509 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