CVE-2011-0454
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 · uneditedBuffer overflow in the PPP Access Concentrator (PPPAC) on the SEIL/x86 with firmware 1.00 through 1.61, SEIL/B1 with firmware 1.00 through 3.11, SEIL/X1 with firmware 1.00 through 3.11, SEIL/X2 with firmware 1.00 through 3.11, SEIL/Turbo with firmware 1.80 through 2.10, and SEIL/neu 2FE Plus with firmware 1.80 through 2.10 might allow remote attackers to execute arbitrary code via a PPPoE packet.
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 confidenceBuffer overflow vulnerability in the PPP Access Concentrator (PPPAC) component of multiple SEIL firewall appliance models. The flaw exists in PPPoE packet handling and can be triggered by specially crafted packets, potentially allowing remote attackers to execute arbitrary code with elevated privileges.
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= 1.00= 2.01= 2.10= 2.20= 2.30= 2.40= 2.41= 2.42= 2.50= 2.51= 2.52= 2.60all versions= 1.00= 1.10= 1.11= 1.20= 1.21= 1.22= 1.30= 1.31= 1.32= 1.40= 1.41= 1.43all versions= 1.00= 1.10= 1.11= 1.20= 1.21= 1.22= 1.30= 1.31= 1.32= 1.40= 1.41= 1.43all versions= 1.00= 1.61all versionsCVSS 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
- Authentication
- None
- Confidentiality
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:A/AC:L/Au:N/C:C/I:C/A:C
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 SEIL modelAccess the device console or administrative interface and run 'show system' or check the device label to confirm the model (b1, x1, x2, or x86)Affected if The model is SEIL/b1, SEIL/x1, SEIL/x2, or SEIL/x86
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Check the installed firmware versionRun 'show version' or access the firmware version information in the administrative web interfaceAffected if The firmware version matches any of: b1: 1.00, 2.01-2.60 (any in that range); x1: 1.00, 1.10-1.43 (any in that range); x2: 1.00, 1.10-1.43 (any in that range); x86: 1.00, 1.61 (or any version if 'all versions' applies to your deployment)
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Verify PPPoE/PPPAC is enabledRun 'show pppoe' or 'show interface pppoe' to list active PPPoE configurations, or check the running configuration for 'pppoe' or 'pppac' entriesAffected if PPPoE or PPPAC feature is configured and active on any interface
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Check for PPPoE-facing network exposureReview interface configurations to determine if PPPoE is used on external or WAN-facing interfaces accessible to untrusted networksAffected if PPPoE interfaces are directly exposed to untrusted networks (internet-facing or bridged to external segments)
The environment is affected if the device is a SEIL/b1, x1, x2, or x86 model running any of the listed firmware versions (or any version if 'all versions' applies) AND PPPoE/PPPAC is enabled and accessible.
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 dataApply vendor firmware updates if available; if devices are end-of-life, implement network segmentation to isolate vulnerable PPPoE-facing interfaces or replace with supported hardware.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 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 $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-0454 — 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-2011-0454 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
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