CVE-2020-27338
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 DHCPv6 client component allows an unauthenticated remote attacker to cause an Out of Bounds Read, and possibly a Denial of Service via adjacent 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 confidenceThe Treck IPv6 stack before version 6.0.1.68 contains an improper input validation vulnerability in its DHCPv6 client component. An unauthenticated remote attacker on the adjacent network can send specially crafted DHCPv6 packets to trigger an out-of-bounds read vulnerability, potentially leading to information disclosure or denial of service.
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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/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 if Treck IPv6 stack is in useSearch system files, libraries, firmware images, or documentation for 'treck' or 'Treck IPv6' strings. Check embedded device firmware if this is a network appliance or IoT device.Affected if Treck IPv6 library or component is present in the environment
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Determine the installed Treck IPv6 versionLocate the treck library binary or firmware version information. Common locations: /lib/libtreck*, embedded firmware metadata, or vendor release notes. Compare against version 6.0.1.68.Affected if Installed version is lower than 6.0.1.68
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Verify DHCPv6 client functionality is enabledCheck device or system configuration for DHCPv6 client settings. Look for IPv6 configuration files, network manager settings, or device web interfaces that enable DHCPv6 address assignment.Affected if DHCPv6 client is enabled and the system uses IPv6 networking
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Assess network exposure to adjacent attackersEvaluate whether the system is reachable from untrusted adjacent networks. Check if IPv6 is active on interfaces accessible to untrusted users, bridges, or wireless networks.Affected if System has active IPv6 connectivity on exposed network segments
A system is affected if it runs a Treck IPv6 version below 6.0.1.68 with the DHCPv6 client enabled and has IPv6 network exposure to adjacent attackers.
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 to version 6.0.1.68 or later. If patches are unavailable from the vendor, consider network segmentation to limit exposure to adjacent network attackers and monitor for anomalous DHCPv6 traffic.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-27338 — 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-2020-27338 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data