Broadband Operating SystemOperating system · Cisco
CVE-2001-0056
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 · uneditedThe Cisco Web Management interface in routers running CBOS 2.4.1 and earlier does not log invalid logins, which allows remote attackers to guess passwords without detection.
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 Cisco CBOS web management interface prior to version 2.4.1 fails to log invalid login attempts, allowing remote attackers to conduct unlimited password guessing attacks without triggering any audit logs or detection mechanisms.
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
Broadband Operating SystemOperating system
<= 2.4.1CVSS 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
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:N/AC:L/Au:N/C:P/I:P/A:P
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 CBOS versionAccess the device console or use SNMP to query the CBOS version. Common command: 'show version' or 'show hardware' from the CLI prompt. Alternatively, access the web management interface and check the system information page.Affected if The displayed version is 2.4.1 or lower.
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Confirm web management interface is enabledCheck the CBOS configuration for HTTP server settings. Use command 'show config' or 'show running-config' and look for 'ip http server' or similar HTTP/HTTPS enable statements.Affected if The web management interface (HTTP server) is enabled in the configuration.
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Verify login failure logging is activeAttempt a deliberate failed login through the web interface using an incorrect password. Then check system logs, audit logs, or use 'show log' command to see if the failed attempt was recorded.Affected if Failed login attempts are NOT logged or recorded in any system log.
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Compare version against affected rangeDocument the exact CBOS firmware version from step 1. Compare it to the affected range: any version <= 2.4.1 is vulnerable.Affected if Version is 2.4.1 or any earlier version.
A user is affected if the device runs Cisco CBOS version 2.4.1 or lower AND the web management interface is enabled AND failed login attempts are not being logged.
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 CBOS firmware to a version beyond 2.4.1 that implements login failure logging, or disable the web management interface and use alternative secure management methods.
Fix this in Broadband Operating System
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2001-0056 — 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-2001-0056 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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