Ios XrOperating system · Cisco
CVE-2016-1456
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 CLI in Cisco IOS XR 6.x through 6.0.1 allows local users to execute arbitrary OS commands in a privileged context by leveraging unspecified container access, aka Bug ID CSCuz62721.
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 · moderate confidenceThe CLI in Cisco IOS XR versions 6.x through 6.0.1 contains a vulnerability where local users can execute arbitrary operating system commands in a privileged context by leveraging unspecified container access. This allows a low-privileged local attacker to escape containerization and run commands with elevated (privileged) permissions.
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
Ios XrOperating system
= 6.0.0= 6.0.1= 6.0_baseCVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:L/AC:L/PR:L/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.
-
Identify the product and versionExecute 'show version' on the device CLI and locate the IOS XR version string in the outputAffected if The version displayed is 6.0.0, 6.0.1, or falls within the 6.0_base release line (6.x through 6.0.1)
-
Confirm local user accounts existRun 'show users' or 'show running-config | include username' to list locally configured user accounts on the systemAffected if Local user accounts are configured and active on the device
-
Verify container or virtual container access is availableCheck if the device exposes containerized CLI access points or VM management interfaces accessible to local users, such as bash or shell access within containersAffected if Local users have access to any containerized CLI or shell environment on the device
-
Check AAA and user privilege configurationReview 'show running-config | include aaa' to see authentication settings and examine what privilege level local users are assignedAffected if Local users are assigned privileges that permit entry into containerized environments
The environment is affected if the device runs Cisco IOS XR version 6.0.0, 6.0.1, or 6.0_base AND local user accounts can access containerized CLI environments on the system.
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-supplied patch from Cisco (refer to CSCuz62721), and restrict local user access to containerized environments. Limit physical and logical access to the device to trusted administrators only.
Fix this in Ios Xr
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,096.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2016-1456 — 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-2016-1456 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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