Ios Xe Sd WanOperating system · Cisco

CVE-2021-1300

CRITICAL · 9.8 CVSS v3.1 Published 2021-01-20

Mitigation only

No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.

See remediation →

100/100

Remediation priority · Urgent

Remotely reachable No privileges Zero-click

Official description

NVD · unedited

Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute attacks against an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Technical summary

dbcve analysis · moderate confidence

Multiple critical-severity vulnerabilities in Cisco SD-WAN software allow unauthenticated remote attackers to execute arbitrary attacks against affected devices.

MitigationApply vendor-supplied patches or updates for Cisco SD-WAN products as specified in the official Cisco security advisory.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions

NVD · CPE data

Ios Xe Sd WanOperating system

Affected:all versions

Sd Wan FirmwareOperating system

Affected:= 18.3.8= 18.4.4= 19.2.1= 19.2.99

Sd Wan Vsmart Controller FirmwareOperating system

Affected:all versions

Catalyst Sd Wan ManagerApplication

Affected:all versions

Sd Wan Vbond OrchestratorApplication

Affected:all versions

CVSS breakdown

From the vector

Attack vector: Network
Complexity: Low
Privileges: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected?

dbcve checks

Work through these to decide whether this CVE applies to you.

Identify Cisco SD-WAN product deployment

Inventory network devices and identify any Cisco SD-WAN components (vBond, vSmart, vEdge, Cisco SD-WAN Manager, IOS-XE SD-WAN) in the environment. Check device model numbers and running software.

Affected if Any Cisco SD-WAN product (vBond Orchestrator, vSmart Controller, vEdge, Catalyst SD-WAN Manager, or IOS-XE with SD-WAN) is deployed.
Check IOS-XE SD-WAN version

On Cisco IOS-XE devices with SD-WAN capability, run 'show version' or 'show sdwan version' to obtain the software version.

Affected if The device runs Cisco IOS-XE SD-WAN (any version, as all versions are affected per the advisory).
Check SD-WAN Firmware version

On vEdge or SD-WAN edge devices, run 'show software' or check the firmware version via the vManage web interface under Device > Inventory.

Affected if The firmware version matches exactly: 18.3.8, 18.4.4, 19.2.1, or 19.2.99.
Check vSmart Controller version

Run 'show version' on vSmart Controller or check via vManage under Controllers > vSmart.

Affected if Any version of Cisco SD-WAN vSmart Controller firmware is running (all versions affected).
Check vBond Orchestrator version

Run 'show version' on vBond or check via vManage under Orchestrators.

Affected if Any version of Cisco SD-WAN vBond Orchestrator is running (all versions affected).
Verify SD-WAN feature is active

Check that the SD-WAN control connection is established using 'show sdwan control connections' on IOS-XE or 'show control connections' on vEdge/vSmart.

Affected if The SD-WAN feature is enabled and the device has active SD-WAN control plane connections, making it exploitable.

If any Cisco SD-WAN product (vBond, vSmart, vEdge, Catalyst SD-WAN Manager, or IOS-XE SD-WAN) is deployed and the SD-WAN feature is active, the environment is affected by CVE-2021-1300.

Generated from the published advisory. Verify against your own configuration.

Remediation

From vendor data

Mitigation available No clean upgrade yet — mitigate in the meantime

Mitigation

Apply vendor-supplied patches or updates for Cisco SD-WAN products as specified in the official Cisco security advisory.

Fix this in Ios Xe Sd Wan Scoped from the published advisory

Consultation4.0 h
Implementation8.0 h
Testing12.0 h
Review / QA4.0 h

28.0 hours of engineering $4,760

Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,616.

Scan for this in your stack

Free · runs locally

dbcve dependency scanner

Check whether your project pulls in CVE-2021-1300 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

References

Primary sources

tools.cisco.comVendor Advisory
nvd.nist.govNVD record

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-1300 in production — separate from our analysis above.

Notes0 Guidelines

Know something about CVE-2021-1300?

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.

What this is

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.

What belongs here

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

At a glance

A fix existsA vendor remedy is published

Severity 9.8 Critical

Exploit likelihood EPSS, next 30 days 2.1%

Affects: Ios Xe Sd Wan

Remediation

A high-priority fix

Fix this in Ios Xe Sd Wan 28 hrs · Moderate

Typical engagement from $4,760

Get a fix See the full breakdown ↓

A high-priority vulnerability. Send your environment and a specialist will scope CVE-2021-1300 and return a fixed quote and timeline.

You’ll deal with our team directly and deploy the reviewed fix to staging first — never straight to production.

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.

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.

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.

CVSS 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.

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.

Check your environment

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.

Scan for this in your stack

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Practitioner notes

No notes yet

Official description

Technical summary

Affected products & versions

CVSS breakdown

Am I affected?

Remediation

References