Aironet 3700e FirmwareOperating system · Cisco
CVE-2019-1920
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 802.11r Fast Transition (FT) implementation for Cisco IOS Access Points (APs) Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected interface. The vulnerability is due to a lack of complete error handling condition for client authentication requests sent to a targeted interface configured for FT. An attacker could exploit this vulnerability by sending crafted authentication request traffic to the targeted interface, causing the device to restart unexpectedly.
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 the 802.11r Fast Transition (FT) implementation for Cisco IOS Access Points allows an unauthenticated, adjacent attacker to cause denial of service by sending crafted authentication request traffic to a targeted interface configured for FT. The root cause is incomplete error handling for client authentication requests, which triggers an unexpected device restart.
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
Aironet 3700e FirmwareOperating system
= 15.3\(3\)jc14= 15.3\(3\)jd6
Aironet 3700i FirmwareOperating system
= 15.3\(3\)jc14= 15.3\(3\)jd6
Aironet 3700p FirmwareOperating system
= 15.3\(3\)jc14= 15.3\(3\)jd6
Access PointsOperating system
< 8.2.170.0>= 8.3, < 8.3.150.0>= 8.4, < 8.5.131.0>= 8.6, < 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
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/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.
-
Identify AP model and firmware versionLog into the AP CLI or controller and run 'show version' or check the access point model and firmware version through the wireless controller GUIAffected if The device is a Cisco Aironet 3700e/3700i/3700p running firmware 15.3(3)jc14 or 15.3(3)jd6, OR any Cisco AP running IOS version less than 8.2.170.0, or between 8.3 and 8.3.149.999, or between 8.4 and 8.5.130.999, or between 8.6 and 8.8.99.999
-
Confirm 802.11r Fast Transition is enabledRun 'show wireless mobility' or 'show run-config' on the AP or controller, or check the wireless interface configuration for ' Mobility Interfunk' and FT settingsAffected if 802.11r Fast Transition is enabled on any wireless interface or mobility group configuration on the device
-
Verify interface is configured for client accessCheck wireless interface status with 'show interface' or view WLAN configuration to confirm the interface is active and accepting client associationsAffected if The AP has an active WLAN/SSID configured that accepts client connections
The environment is affected if the AP model and firmware version match the affected ranges AND 802.11r Fast Transition is enabled on a configured wireless interface.
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
Apply the relevant Cisco IOS software update for affected APs, or disable 802.11r Fast Transition on vulnerable interfaces if patching is not immediately feasible.
Fix this in Aironet 3700e Firmware
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 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 $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-1920 — 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-2019-1920 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