CVE-2021-42809
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 Access Control of Dynamically-Managed Code Resources (DLL) in Thales Sentinel Protection Installer could allow the execution of arbitrary 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 confidenceThis is a DLL hijacking vulnerability in the Thales Sentinel Protection Installer where improper access control over dynamically-managed code resources (DLL files) allows an attacker to potentially place and load a malicious DLL, leading to arbitrary code execution with the privileges of the affected application.
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< 7.7.1CVSS 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
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 Sentinel Protection Installer versionLocate the Sentinel Protection Installer on the system (typically in Program Files or a Thales-specific directory) and check its version property, or run 'msiinfo' or 'powershell get-item' on the installer MSI/EXE to retrieve the version numberAffected if The installed version is below 7.7.1 (for example, 7.6.x, 7.5.x, etc.)
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Identify DLL load directoriesReview the application's documentation or monitor DLL loading behavior using tools like Process Monitor to identify directories where the installer searches for DLL files at runtimeAffected if The application loads DLLs from user-writable directories (such as the working directory, temp folders, or unprivileged program directories)
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Inspect file permissions on DLL directoriesUse 'icacls' or File Explorer security properties to examine write permissions on the directories where the installer loads DLLs fromAffected if Non-administrative users or the Everyone group have Write or Write+Execute permissions on directories in the DLL search path
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Check for unauthorized DLL placementEnumerate all DLL files present in the installation directory and any directories in the DLL search path, comparing against expected/known DLLs from a clean installationAffected if Unexpected DLL files exist in directories where the Sentinel Protection Installer loads code, or DLL files with unusual timestamps are present
A system is affected if the Sentinel Protection Installer version is below 7.7.1 AND the application loads DLLs from directories with weak or overly permissive file access controls.
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.
dbcve · scoped7.7.1
Apply vendor-provided patches when available. In the interim, restrict write access to directories where the installer loads DLLs, use absolute DLL paths where possible, and monitor for unauthorized DLL placement in application directories.
7.7.1 or later
- Download Sentinel Protection Installer version 7.7.1 or later from the Thales customer portal (cpl.thalesgroup.com)
- Verify the download integrity using checksums provided by Thales
- Close any running applications that use Sentinel licensing components
- Run the upgraded Sentinel Protection Installer with appropriate administrator privileges
- Follow Thales installation documentation for the specific version
- Restart the system after installation completes
- Verify the installed version matches the expected fixed version (7.7.1 or later)
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-42809 — 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-2021-42809 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