CVE-2020-27336
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 · uneditedAn issue was discovered in Treck IPv6 before 6.0.1.68. Improper input validation in the IPv6 component when handling a packet sent by an unauthenticated remote attacker could result in an out-of-bounds read of up to three bytes via network access.
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 confidenceTreck IPv6 before version 6.0.1.68 contains an improper input validation vulnerability in its IPv6 packet handling component. An unauthenticated remote attacker can send a specially crafted IPv6 packet to trigger an out-of-bounds read of up to three bytes, potentially exposing limited memory contents.
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< 6.0.1.68CVSS 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
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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 if Treck IPv6 library is in useReview product documentation, software bill of materials (SBOM), or runtime dependencies to confirm the Treck IPv6 library is integrated into your system or device firmwareAffected if Treck IPv6 library is present in the environment
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Determine the installed Treck IPv6 versionLocate the Treck library binary or version information file (commonly embedded in firmware or linked libraries) and compare the version string to 6.0.1.68Affected if The installed version is lower than 6.0.1.68
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Verify IPv6 functionality is enabledCheck system or application configuration for IPv6 protocol support - this may be a compile-time flag, runtime setting, or network interface configurationAffected if IPv6 is enabled and actively used
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Confirm network exposure to IPv6 trafficDetermine whether the system processes IPv6 packets from untrusted sources - check firewall rules, network segmentation, and interface bindings for IPv6Affected if The system accepts IPv6 packets from network sources
You are affected if your environment uses a Treck IPv6 library version lower than 6.0.1.68 with IPv6 enabled and exposed to network traffic.
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 data6.0.1.68
Update Treck IPv6 library to version 6.0.1.68 or later, which contains the fix for proper input validation. If immediate patching is not possible, consider network-level filtering of untrusted IPv6 traffic as a compensating control.
- Consultation4.0 h
- Implementation4.0 h
- Testing6.0 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 $4,448.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-27336 — 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-2020-27336 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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