Ios XeOperating system · Cisco
CVE-2023-20033
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 Cisco IOS XE Software for Cisco Catalyst 3650 and Catalyst 3850 Series Switches could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper resource management when processing traffic that is received on the management interface. An attacker could exploit this vulnerability by sending a high rate of traffic to the management interface. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
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 vulnerability in Cisco IOS XE Software for Catalyst 3650 and 3850 switches stems from improper resource management when processing traffic on the management interface. An unauthenticated remote attacker can exploit this by sending a high rate of traffic to the management interface, causing the device to unexpectedly reload and resulting in denial of service.
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 XeOperating system
= 16.3.1= 16.3.1a= 16.3.2= 16.3.3= 16.3.4= 16.3.5= 16.3.5b= 16.3.6= 16.3.7= 16.3.8= 16.3.9= 16.3.10CVSS 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
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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 device model and IOS XE versionRun 'show version' or 'show inventory' command on the device to retrieve the hardware model and installed IOS XE software versionAffected if Device is a Catalyst 3650 or 3850 switch running IOS XE version 16.3.1 through 16.3.10 (any of the listed point releases)
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Confirm management interface is configuredRun 'show ip interface brief' or 'show running-config interface Management0/0' to identify if a management interface is activeAffected if A management interface (typically Management0/0) is configured and active on the device
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Verify management interface is reachableCheck if the management interface has an IP address assigned and is accessible from untrusted networks by reviewing 'show interface Management0/0' outputAffected if Management interface has an IP address in a network reachable by untrusted or public networks
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Check for existing rate limiting or ACLs on management interfaceRun 'show access-lists' and inspect management interface configuration for any input rate-limit or ACL bindingsAffected if No rate limiting or access control lists are applied to the management interface, leaving it exposed to high-rate traffic
The device is affected if it is a Catalyst 3650 or 3850 switch running any IOS XE version between 16.3.1 and 16.3.10 with an active management interface exposed to untrusted traffic without rate limiting protection.
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 dataImplement rate limiting or access control lists on the management interface to restrict inbound traffic, and apply available Cisco IOS XE software patches when released. Consider disabling unused management protocols or restricting management access to trusted IP addresses.
Fix this in Ios Xe
Scoped from the published advisory
- Consultation4.0 h
- Implementation6.0 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 $4,544.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-20033 — 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-2023-20033 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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