Security readout for executives and security teams
Plain-English summary
Cisco wireless controllers in the Catalyst 9800 family can be crashed by malformed CAPWAP traffic from a network-adjacent, unauthenticated attacker. The business impact is wireless service disruption, not data theft or privilege escalation based on the provided sources.
Executive priority
Treat as a high-priority availability risk for organizations dependent on Cisco Catalyst 9800 wireless infrastructure. It does not indicate data compromise, but a successful attack could disrupt wireless connectivity by forcing controller reloads.
Technical view
CVE-2020-3488 is an insufficient input validation issue in CAPWAP packet processing in Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers. A malformed CAPWAP packet can trigger a crash and reload, causing denial of service. CVSS is 7.4 High with adjacent attack vector and availability impact.
Likely exposure
Exposure is most relevant where Cisco Catalyst 9800 Series Wireless Controllers process CAPWAP traffic from adjacent network segments. The source bundle does not provide exact affected IOS XE versions or fixed releases.
Exploitation context
The CVE describes unauthenticated adjacent exploitation using malformed CAPWAP packets. CISA KEV status is false in the provided bundle, and no cited source here supports active exploitation in the wild.
Researcher notes
Key constraints are adjacent network access, no authentication requirement, and availability-only impact. Evidence in the bundle supports malformed CAPWAP packet handling as the trigger, but does not include exact affected releases, proof-of-concept status, or confirmed exploitation.
Mitigation direction
- Review Cisco advisory cisco-sa-capwap-dos-TPdNTdyq for affected and fixed IOS XE releases.
- Inventory Catalyst 9800 Series Wireless Controllers running Cisco IOS XE.
- Prioritize upgrades where controllers support critical wireless networks.
- Limit CAPWAP reachability to expected access point and management network paths.
- Monitor for unexplained controller crashes, reloads, or wireless service interruptions.
Validation and detection
- Confirm whether deployed wireless controllers are Cisco Catalyst 9800 Series models.
- Compare controller IOS XE versions against Cisco advisory guidance.
- Review controller logs for crash, reload, and CAPWAP-related fault indicators.
- Check network segmentation for unnecessary adjacent access to CAPWAP processing paths.
- Document business impact for sites dependent on affected wireless controllers.
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
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Open ATT&CK lookupCVE-2020-3488 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.