Wireless Lan ControllerApplication · Cisco
CVE-2019-1799
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 handling of Inter-Access Point Protocol (IAPP) messages by Cisco Wireless LAN Controller (WLC) Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. The vulnerability exist because the software improperly validates input on fields within IAPP messages. An attacker could exploit the vulnerability by sending malicious IAPP messages to an affected device. A successful exploit could allow the attacker to cause the Cisco WLC Software to reload, resulting in a DoS condition. Software versions prior to 8.2.170.0, 8.5.150.0, and 8.8.100.0 are affected.
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 confidenceCisco Wireless LAN Controller software has an input validation vulnerability in its Inter-Access Point Protocol (IAPP) message handling. An unauthenticated, adjacent attacker can send malformed IAPP messages containing improperly validated fields, causing the WLC to reload and result in a 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
Wireless Lan ControllerApplication
< 8.2.170.0
Wireless Lan Controller SoftwareOperating system
>= 8.3.143.0, < 8.3.150.0>= 8.5.103.0, < 8.5.131.0>= 8.6.101.0, < 8.8.100.0CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/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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Confirm Cisco Wireless LAN Controller is presentAccess the WLC CLI and run `show inventory` or `show version` to identify the device typeAffected if The device is a Cisco Wireless LAN Controller model (such as 5500, 8500 series, or virtual WLC)
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Determine the installed software versionRun `show version` on the WLC CLI and locate the software release number in the outputAffected if The version is below 8.2.170.0, between 8.3.143.0 and 8.3.149.0, between 8.5.103.0 and 8.5.130.0, or between 8.6.101.0 and 8.8.99.0
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Verify IAPP protocol is in useRun `show run-config | include iapp` or check the running configuration with `show run-config` to see if IAPP messaging is enabledAffected if IAPP is enabled (this is typically enabled by default when multiple APs communicate with the controller)
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Confirm access points are joined to the controllerRun `show ap join summary` to list access points connected to the WLCAffected if One or more access points are joined to the controller, as IAPP handles inter-AP communication
The environment is affected if the WLC runs a software version matching the affected ranges and has IAPP enabled with access points joined.
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 data8.2.170.08.3.150.08.5.131.0
Upgrade Cisco WLC Software to version 8.2.170.0, 8.5.150.0, 8.8.100.0 or later to address the input validation vulnerability in IAPP message processing.
Fix this in Wireless Lan Controller
Scoped from the published advisory
- Consultation4.0 h
- Implementation4.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,504.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-1799 — 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-2019-1799 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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- Version or environment caveats, and links to real fixes
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