Security readout for executives and security teams
Plain-English summary
Affected Cisco Catalyst 9000 wireless controllers can be crashed remotely by malformed CAPWAP traffic. The business impact is wireless service disruption, not data theft. The issue is high urgency for environments where these controllers support critical connectivity or can receive CAPWAP traffic from untrusted networks.
Executive priority
Treat as high priority where wireless availability is business-critical. The risk is operational outage, not confidentiality loss. Patch planning should follow Cisco guidance, with exposure reduction until confirmed fixed.
Technical view
CVE-2021-1565 covers CAPWAP packet-processing flaws in Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers. Insufficient packet validation can allow unauthenticated remote DoS, causing device crash and reload. The source bundle lists CWE-415 and CVSS 3.1 score 8.6.
Likely exposure
Exposure is limited to Cisco Catalyst 9000 Family Wireless Controllers running affected Cisco IOS XE Software, especially where CAPWAP traffic can reach the controller. The provided sources do not list exact affected versions.
Exploitation context
The bundle describes unauthenticated remote exploitation by malformed CAPWAP packets causing crash and reload. It does not provide evidence of active exploitation, and KEV status is false.
Researcher notes
The source bundle names CAPWAP packet validation as the root issue and crash/reload as impact. Exact affected and fixed versions are not included here, so validation depends on the Cisco advisory.
Mitigation direction
- Check Cisco advisory for affected releases and fixed software guidance.
- Inventory Catalyst 9000 wireless controllers running IOS XE Software.
- Prioritize vendor-recommended upgrades for exposed or business-critical controllers.
- Restrict CAPWAP reachability to trusted network paths where architecture allows.
Validation and detection
- Identify Catalyst 9000 devices operating as wireless controllers.
- Compare installed IOS XE releases against the Cisco advisory.
- Confirm CAPWAP access is limited to expected access point networks.
- Review controller logs for unexplained crashes or reloads.
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-415: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-1565 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
- 8.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20210922 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers 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.
Double Free
Double Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.