Security readout for executives and security teams
Plain-English summary
CVE-2020-3487 can let someone near the affected wireless controller network crash and reload Cisco Catalyst 9800 Series Wireless Controllers. The business impact is wireless control-plane downtime, not data theft. The provided sources do not identify affected release numbers or confirm active exploitation.
Executive priority
Treat as high priority where wireless availability supports operations, sites, or customer services. The risk is service disruption from controller reloads. Prioritize identifying exposed controllers and following Cisco’s advisory, especially in environments where adjacent network access is plausible.
Technical view
The issue is insufficient validation of CAPWAP packets in Cisco IOS XE Wireless Controller Software for Cisco Catalyst 9800 Series Wireless Controllers. It is CWE-20 with CVSS 3.0 score 7.4. An unauthenticated adjacent attacker can trigger a crash and reload, causing denial of service.
Likely exposure
Organizations using Cisco Catalyst 9800 Series Wireless Controllers running affected Cisco IOS XE Wireless Controller Software. Exposure depends on whether an attacker can reach the adjacent CAPWAP processing path. Specific affected versions are not provided in the source bundle.
Exploitation context
The source bundle states unauthenticated adjacent exploitation is possible through malformed CAPWAP packets. CISA KEV status is false, and the provided sources contain no evidence of active exploitation in the wild.
Researcher notes
The bundle does not provide affected version ranges, fixed release names, workarounds, or exploit telemetry. Analysis should stay anchored to Cisco’s advisory and CVE metadata. Validation should focus on asset identification, version applicability, CAPWAP reachability, and evidence of reload behavior.
Mitigation direction
- Check Cisco advisory for affected releases and fixed software guidance.
- Prioritize remediation for controllers supporting critical wireless operations.
- Restrict adjacent network access to wireless controller CAPWAP paths where feasible.
- Monitor controllers for unexpected crashes, reloads, or DoS symptoms.
Validation and detection
- Inventory Cisco Catalyst 9800 Series Wireless Controllers and IOS XE versions.
- Compare installed versions against Cisco advisory applicability guidance.
- Review logs for crash, reload, or CAPWAP-related instability indicators.
- Confirm network segmentation limits adjacent access to controller management and CAPWAP paths.
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-2020-3487 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.