Security readout for executives and security teams
Plain-English summary
This flaw can let someone on an adjacent network crash and reload affected Cisco Catalyst 9800 wireless controllers. The business impact is wireless service disruption, not data theft, based on the supplied evidence.
Executive priority
Treat this as high priority for sites where wireless availability is operationally important. The issue is an availability risk requiring adjacent access, so urgency depends on network segmentation and the criticality of affected controllers.
Technical view
CVE-2020-3493 covers CAPWAP packet validation weaknesses in Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers. An unauthenticated adjacent attacker could trigger a device crash and reload through malformed CAPWAP traffic, causing denial of service. It is CWE-20 with CVSS 3.0 score 7.4.
Likely exposure
Exposure is most likely where Cisco Catalyst 9800 Series Wireless Controllers run affected IOS XE software and adjacent networks can reach CAPWAP processing. The supplied sources do not establish broad internet exposure or non-Cisco affected products.
Exploitation context
The source bundle says exploitation requires adjacent network access and no authentication. It does not cite public exploit availability, active exploitation, or CISA KEV listing. Treat active exploitation as unconfirmed.
Researcher notes
Evidence supports unauthenticated adjacent denial of service via insufficient CAPWAP packet validation. The supplied data names Cisco IOS XE on Catalyst 9800 Series Wireless Controllers only. No exploit status, fixed version list, or detailed workaround text is included in the bundle.
Mitigation direction
- Review Cisco’s advisory for affected and fixed IOS XE release guidance.
- Prioritize updates for controllers supporting critical wireless environments.
- Restrict CAPWAP reachability to trusted AP and controller network segments.
- Monitor affected controllers for unexpected reloads or crash events.
- Check vendor guidance before relying on compensating controls.
Validation and detection
- Inventory Cisco Catalyst 9800 wireless controllers and IOS XE versions.
- Compare deployed versions against Cisco’s advisory.
- Confirm CAPWAP access is limited to intended adjacent network paths.
- Review controller logs for crash, reload, or CAPWAP processing anomalies.
- Document whether each controller is patched, segmented, or pending remediation.
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-2020-3493 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/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:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H2.84Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.4HighVector: CVSS:3.0/AV:A/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 Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Service VulnerabilitiesCVE 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.