Security readout for executives and security teams
Plain-English summary
CVE-2020-3492 is a high-severity denial-of-service issue in Cisco wireless controllers. A remote unauthenticated attacker could send a crafted CAPWAP packet that appears to come from an existing access point, causing a controller process crash and device reload. The business impact is wireless service disruption, not data theft.
Executive priority
Treat this as a high-priority availability risk for wireless-dependent sites. It does not indicate confidentiality or integrity compromise, but a successful attack could interrupt business operations by forcing wireless controller reloads.
Technical view
The flaw is improper input validation in the Flexible NetFlow Version 9 packet processor. Cisco describes exploitation through spoofing an existing AP address and sending a CAPWAP packet containing a crafted Flexible NetFlow v9 record. Successful exploitation can crash a process and reload the affected controller.
Likely exposure
Organizations running Cisco Catalyst 9800 Series Wireless Controllers with IOS XE Software or Cisco AireOS Wireless LAN Controllers may be exposed. Exposure depends on affected software versions and whether CAPWAP traffic can reach the controller from attacker-controlled network locations.
Exploitation context
The bundle does not cite active exploitation, and KEV is false. Exploitation is remote and unauthenticated with low complexity, but requires the attacker to spoof an existing AP address and deliver a crafted CAPWAP packet to an affected controller.
Researcher notes
Evidence supports CWE-20 improper input validation, CVSS 8.6, network attack vector, no privileges, no user interaction, changed scope, and high availability impact. The source bundle does not provide specific affected or fixed version ranges, so version conclusions require Cisco advisory review.
Mitigation direction
- Review Cisco advisory cisco-sa-iosxe-wlc-fnfv9-EvrAQpNX for affected and fixed software guidance.
- Prioritize upgrading affected wireless controllers according to Cisco’s supported remediation path.
- Restrict controller-reachable CAPWAP paths to trusted AP management networks where feasible.
- Monitor wireless controllers for unexpected reloads, process crashes, or anomalous CAPWAP traffic.
- Plan maintenance windows because remediation may require controller software updates and reloads.
Validation and detection
- Inventory Cisco Catalyst 9800 and AireOS WLC deployments and record running software versions.
- Compare deployed versions with Cisco’s advisory to confirm exposure status.
- Verify whether untrusted networks can send CAPWAP traffic toward wireless controllers.
- Review controller logs for reloads or process crashes matching the vulnerability context.
- Confirm post-remediation versions align with Cisco’s fixed-software guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-3492 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.6HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200924 Cisco IOS XE Software for Catalyst 9800 Series and Cisco AireOS Software for Cisco WLC Flexible NetFlow Version 9 Denial of Service VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.