Asr 5000 FirmwareOperating system · Cisco
CVE-2018-0217
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 · uneditedA vulnerability in the CLI of the Cisco StarOS operating system for Cisco ASR 5000 Series Aggregation Services Routers could allow an authenticated, local attacker to perform a command injection attack on an affected system. The vulnerability is due to insufficient validation of commands that are supplied to certain configurations in the CLI of the affected operating system. An attacker could exploit this vulnerability by injecting crafted arguments into a vulnerable CLI command for an affected system. A successful exploit could allow the attacker to insert and execute arbitrary commands in the CLI of the affected system. To exploit this vulnerability, the attacker would need to authenticate to an affected system by using valid administrator credentials. Cisco Bug IDs: CSCvg29441.
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 confidenceA command injection vulnerability exists in the CLI of Cisco StarOS operating system for ASR 5000 Series routers. The vulnerability stems from insufficient validation of user-supplied arguments to certain CLI configuration commands. An attacker with valid administrator credentials can inject crafted arguments into vulnerable CLI commands to execute arbitrary operating system commands.
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
Asr 5000 FirmwareOperating system
= 21.3.0.67664= 21.7.0
Asr 5700 FirmwareOperating system
= 21.3.0.67664= 21.7.0
Asr 5500 FirmwareOperating system
= 21.3.0.67664= 21.7.0CVSS 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
- Local
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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 ASR modelRun 'show hardware' or check the physical label to confirm the router is an ASR 5000, ASR 5700, or ASR 5500 series deviceAffected if The device is not one of these three ASR models, the check does not apply
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Check the firmware versionExecute 'show version' in the CLI and locate the StarOS firmware version stringAffected if The firmware version is exactly 21.3.0.67664 or exactly 21.7.0
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Confirm administrator CLI access existsVerify that valid administrator credentials exist for the CLI by checking local user accounts with 'show administrator' or by reviewing authentication configurationAffected if Administrator accounts are configured and can access the CLI, making command injection possible
The environment is affected if the device is an ASR 5000/5700/5500 running firmware version 21.3.0.67664 or 21.7.0 and administrator CLI access is available.
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 the vendor patch from Cisco (Bug ID CSCvg29441). Limit administrative access to trusted personnel and implement least-privilege administrator accounts.
Fix this in Asr 5000 Firmware
Scoped from the published advisory
- Consultation3.0 h
- Implementation5.0 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 $3,936.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-0217 — 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-2018-0217 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