Access PointsOperating system · Cisco
CVE-2018-0441
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 feature set of Cisco IOS Access Points (APs) Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a corruption of certain timer mechanisms triggered by specific roaming events. This corruption will eventually cause a timer crash. An attacker could exploit this vulnerability by sending malicious reassociation events multiple times to the same AP in a short period of time, causing a DoS condition on the affected AP.
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 APs' 802.11r Fast Transition feature allows an unauthenticated, adjacent attacker to cause timer mechanism corruption by sending malicious reassociation events multiple times in quick succession, leading to a timer crash and denial of service on the affected AP.
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
Access PointsOperating system
= 8.0\(140.0\)= 8.2\(141.0\)= 8.2\(151.0\)= 8.3\(102.0\)= 8.3\(112.0\)= 8.3\(114.74\)= 15.3\(3\)jd< 8.3.140.0>= 8.4, < 8.5.110.0CVSS 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:3.0/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 the Cisco AP model and IOS versionRun 'show version' on the AP CLI to retrieve the hardware model and software versionAffected if The IOS version matches any of these patterns: 8.0(140.0), 8.2(141.0), 8.2(151.0), 8.3(102.0), 8.3(112.0), 8.3(114.74), 15.3(3)jd, version below 8.3.140.0, or between 8.4 and 8.5.110.0 (exclusive)
-
Confirm the device is an Access PointRun 'show controllers' or 'show inventory' to verify the device is a Cisco wireless Access PointAffected if The device is confirmed as a Cisco Access Point
-
Verify 802.11r Fast Transition is enabledRun 'show running-config | include 802.11r' or 'show wireless mobility' to check if the Fast Transition feature is configuredAffected if 802.11r Fast Transition is explicitly enabled in the wireless configuration
-
Inspect wireless radio configurationRun 'show running-config | begin dot11' or 'show ap config general' to examine the WLAN and radio settingsAffected if A WLAN is configured with 802.11r Fast Transition roaming enabled on any radio interface
The AP is affected if it runs a vulnerable IOS version from the list AND has 802.11r Fast Transition enabled on any WLAN profile.
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 data8.3.140.08.5.110.0
Apply the corresponding Cisco security update/patch to affected APs. If immediate patching is not feasible, consider disabling 802.11r Fast Transition or implementing network access controls to limit adjacent attacker proximity.
Fix this in Access Points
Scoped from the published advisory
- Consultation6.0 h
- Implementation8.0 h
- Testing4.0 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 $6,048.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-0441 — 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-2018-0441 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