Security readout for executives and security teams
Plain-English summary
This flaw can let someone on an adjacent network crash and reload an affected Cisco wireless controller. The business impact is wireless service disruption, not data theft, based on the provided sources. The risk is meaningful where controller management or CAPWAP traffic is reachable from less-trusted network segments.
Executive priority
Treat this as a high-priority availability risk for wireless operations. It is not described as data compromise, but controller reloads can disrupt business connectivity and incident response operations in affected sites.
Technical view
CVE-2020-3497 is an insufficient input validation issue in Cisco IOS XE CAPWAP packet processing for Cisco Catalyst 9800 Series Wireless Controllers. An unauthenticated adjacent attacker can send malformed CAPWAP packets that cause the affected device to crash and reload, creating a denial-of-service condition. CVSS is 7.4 high.
Likely exposure
Exposure is most likely in environments running affected Cisco IOS XE wireless controller software where CAPWAP processing is reachable from adjacent network paths. The source bundle does not provide exact affected or fixed version numbers.
Exploitation context
The sources describe unauthenticated adjacent exploitation with low attack complexity and no user interaction. The bundle does not cite CISA KEV listing or active exploitation evidence, so active exploitation should not be assumed.
Researcher notes
The key constraint is attack adjacency: exploitation requires network proximity rather than broad internet reachability. Source evidence is limited to CAPWAP malformed packet handling, crash/reload impact, CWE-20, and CVSS 7.4; exact version and fix details require the Cisco advisory.
Mitigation direction
- Review the Cisco advisory for affected and fixed IOS XE release guidance.
- Upgrade or remediate according to Cisco-published guidance for this advisory.
- Restrict CAPWAP reachability to trusted wireless infrastructure segments where feasible.
- Prioritize change windows for controllers supporting critical wireless services.
Validation and detection
- Inventory Cisco IOS XE wireless controllers and identify Catalyst 9800 deployments.
- Compare running software versions against the Cisco advisory.
- Confirm CAPWAP paths are limited to expected AP and controller networks.
- Review controller crash or reload history for unexplained DoS symptoms.
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
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ATT&CK lookup starting points
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CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-3497 mapping review
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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.