CVE-2021-30356
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 denial of service vulnerability was reported in Check Point Identity Agent before R81.018.0000, which could allow low privileged users to overwrite protected system files.
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 confidenceA denial of service vulnerability in Check Point Identity Agent versions prior to R81.018.0000 allows low-privileged users to overwrite protected system files, potentially causing service disruption or privilege escalation through file corruption.
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< r81.018.0000CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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 Check Point Identity Agent is installedCheck for the presence of Check Point Identity Agent on the system. Common locations include Program Files or Program Files (x86) directories, or use system inventory tools to find the software.Affected if Check Point Identity Agent is found on the system
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Determine installed Identity Agent versionLocate the Identity Agent installation directory and find version information in the software's metadata, about dialog, or version file. Alternatively, use Windows Programs and Features or the Check Point management console to view the installed version.Affected if The exact installed version number is identified
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Compare version against affected rangeCompare your installed version number to R81.018.0000. Versions are typically reported in the format R81.xx.xxxx.Affected if Installed version is lower than R81.018.0000 (for example, R81.017, R81.010, or any release prior to R81.018)
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Confirm the vulnerability scope appliesReview whether the Identity Agent service is running and accessible to low-privileged users, as the flaw allows such users to overwrite protected system files.Affected if Identity Agent is running and the service is accessible to users with standard (non-admin) privileges
If Check Point Identity Agent is installed with any version lower than R81.018.0000, the environment is vulnerable to this privilege escalation and file corruption issue.
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 Check Point Identity Agent to version R81.018.0000 or later to remediate this vulnerability.
- Consultation4.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-30356 — 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-2021-30356 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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