CVE-2021-40852
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 · uneditedTCMAN GIM is affected by an open redirect vulnerability. This vulnerability allows the redirection of user navigation to pages controlled by the attacker. The exploitation of this vulnerability might allow a remote attacker to obtain information.
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 confidenceTCMAN GIM contains an open redirect vulnerability where user-supplied input is used in redirection logic without proper validation, allowing attackers to craft malicious URLs that redirect users to attacker-controlled domains. This can facilitate phishing attacks and credential theft.
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= 8.0= 11.0CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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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Confirm TCMAN GIM installationLocate the TCMAN GIM application directory or binary on the system. Check for files or services related to 'tcman' or 'gim'. On Linux, common paths may include /opt/, /usr/local/, or the application's installation directory.Affected if TCMAN GIM software is found on the system
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Determine installed versionCheck version information for TCMAN GIM - typically accessible via command line (e.g., 'tcman version', 'gim --version'), a version file in the installation directory, or the application's web interface about/page.Affected if The installed version is exactly 8.0 or exactly 11.0
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Identify web interface or redirect endpointsLocate configuration files (XML, YAML, properties, or JSON) that define URL redirect logic, routing rules, or endpoint definitions. Look for parameters that accept URLs or paths used in redirection (commonly named 'redirect', 'url', 'next', 'target', or similar).Affected if A web interface exists and accepts user-supplied URLs or paths in redirect parameters without validation
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Test redirect parameter behaviorIf a redirect parameter is identified, observe whether arbitrary external domains can be specified and whether the application performs any validation on the supplied value before redirecting.Affected if User-supplied input in redirect parameters is not validated against a whitelist and allows arbitrary external URLs
A user is affected if TCMAN GIM version 8.0 or 11.0 is installed and exposes a redirect feature that uses unvalidated user input to determine the destination URL.
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 strict whitelist-based validation for all redirect parameters, ensuring only trusted internal paths are allowed. Alternatively, avoid using user input directly in redirect destinations and use fixed relative paths.
- 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-2021-40852 — 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-2021-40852 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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