CVE-2021-41530
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 · uneditedForcepoint NGFW Engine versions 6.5.11 and earlier, 6.8.6 and earlier, and 6.10.0 are vulnerable to TCP reflected amplification vulnerability, if HTTP User Response has been configured.
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 confidenceForcepoint NGFW Engine versions 6.5.11 and earlier, 6.8.6 and earlier, and 6.10.0 contain a TCP reflected amplification vulnerability that can be exploited when HTTP User Response is configured, allowing attackers to magnify traffic toward victims.
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<= 6.5.11>= 6.8.0, <= 6.8.6= 6.10.0CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 the installed Forcepoint NGFW Engine versionAccess the NGFW management interface or use the system status command to retrieve the engine version number. Common methods include the SMC web client under Dashboard > System Health, or the 'fwaccel stats -v' command-line query on the engine.Affected if The version falls within <= 6.5.11, >= 6.8.0 and <= 6.8.6, or equals exactly 6.10.0
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Locate the HTTP User Response feature configurationNavigate to the NGFW policy elements or security engine settings in the SMC (Security Management Center) interface. Look for 'HTTP User Response' or 'User Response' under the Policy Configuration or Engine Properties section.Affected if HTTP User Response feature is found and listed as enabled in the configuration
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Verify TCP reflect amplification exposureInspect the specific policy rule or engine configuration where HTTP User Response is active. Confirm that the feature is actively processing HTTP requests and returning responses that could be leveraged for amplification.Affected if HTTP User Response is actively enabled and processing traffic
A system is affected if it runs a Forcepoint NGFW Engine version within the affected ranges AND has HTTP User Response feature enabled in its configuration.
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 dataDisable HTTP User Response feature if not required, or upgrade to a patched version beyond the affected releases.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-41530 — 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-2021-41530 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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