CVE-2021-25695
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 · uneditedThe USB vHub in the Teradici PCOIP Software Agent prior to version 21.07.0 would accept commands from any program, which may allow an attacker to elevate privileges by changing the flow of program execution within the vHub driver.
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 · high confidenceThe USB vHub component in Teradici PCOIP Software Agent prior to version 21.07.0 lacks proper validation of command sources, allowing any unprivileged program to send commands directly to the vHub driver. This missing authorization check enables a local attacker to manipulate driver execution flow and escalate privileges to system level.
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< 21.07.0CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 PCOIP Software Agent is installedCheck for the presence of Teradici PCOIP Software Agent in installed programs or by searching for PCOIP-related executables and services on the systemAffected if PCOIP Software Agent is installed on the system
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Determine installed PCOIP versionLocate and read the PCOIP Software Agent version information through system inventory tools, program files, or registry entries related to Teradici PCOIPAffected if Installed version is below 21.07.0 or cannot be determined to be 21.07.0 or later
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Confirm vHub USB component presenceCheck for the vHub driver or service component typically associated with PCOIP USB virtual hub functionality, often visible in Windows services, device manager, or running processesAffected if The vHub USB component is present and loaded on the system
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Verify driver accessibilityTest whether unprivileged processes can access the vHub driver interface or device objects, which would indicate the missing authorization check is presentAffected if Unprivileged programs can send commands directly to the vHub driver without restriction
The system is affected if PCOIP Software Agent version is below 21.07.0 and the vHub USB component is loaded, allowing unprivileged command access to the driver.
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 data21.07.0
Upgrade the PCOIP Software Agent to version 21.07.0 or later to obtain the patched vHub component with proper command source validation.
- Consultation2.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,752.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-25695 — 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-2021-25695 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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