CVE-2020-8254
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 · uneditedA vulnerability in the Pulse Secure Desktop Client < 9.1R9 has Remote Code Execution (RCE) if users can be convinced to connect to a malicious server. This vulnerability only affects Windows PDC.To improve the security of connections between Pulse clients and Pulse Connect Secure, see below recommendation(s):Disable Dynamic certificate trust for PDC.
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 confidenceA Remote Code Execution vulnerability exists in Pulse Secure Desktop Client for Windows PDC versions prior to 9.1R9. Attackers can achieve RCE by tricking users into connecting to a malicious Pulse Connect Secure server. This vulnerability is specific to the Windows PDC component and requires user interaction (connecting to the attacker's server).
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< 9.1= 9.1CVSS 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
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/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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Identify Pulse Secure Desktop Client installationLocate the Pulse Secure Desktop Client installation on the Windows system - typically found in Program Files or via Add/Remove ProgramsAffected if The client is installed and the PDC (Pulse Desktop Client) component is present
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Determine the installed versionCheck the version of the Pulse Secure Desktop Client - this can be done through the application's About dialog, Windows Programs and Features, or by right-clicking the executable and viewing PropertiesAffected if The version is 9.1 or any version prior to 9.1R9 (such as 9.0.x, 8.x, or earlier)
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Confirm PDC component is presentVerify that the PDC (Pulse Desktop Client) component is installed - this is the Windows-specific component mentioned in the CVEAffected if The PDC component is installed on the Windows system
The environment is affected if Pulse Secure Desktop Client with PDC component is installed and the version is 9.1 or any version prior to 9.1R9, since the vulnerability is triggered when a user connects to a malicious Pulse Connect Secure server.
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 data9.1
Disable Dynamic certificate trust for PDC to prevent connections to untrusted or malicious VPN servers. Users should also be trained to avoid connecting to unverified Pulse Secure servers.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-8254 — 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-2020-8254 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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