Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Denial of Service Vulnerabilities
Priority MEDIUM 48CWE-415Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-415 and the CVSS impact.
Summary
Multiple vulnerabilities in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. These vulnerabilities are due to insufficient validation of CAPWAP packets. An attacker could exploit the vulnerabilities by sending a malformed CAPWAP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to crash and reload, resulting in a DoS condition.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0139 72nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco IOS XE Software | all versions | — | No fix listed | CNA |
- Cisco IOS XE Software VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 17
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xe:3.15.1xbs:*:*:*:*:*:*:* | 3.15.1xbs | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:3.15.2xbs:*:*:*:*:*:*:* | 3.15.2xbs | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:* | 17.3.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:* | 17.3.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:* | 17.3.2a | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:* | 17.4.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.5.1:*:*:*:*:*:*:* | 17.5.1 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:catalyst_9800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9800-40:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9800-40_wireless_controller:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ios_xe:3.15.1xbs:*:*:*:*:*:*:* Versions 3.15.1xbs Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:3.15.2xbs:*:*:*:*:*:*:* Versions 3.15.2xbs Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:* Versions 17.3.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:* Versions 17.3.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:* Versions 17.3.2a Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:* Versions 17.4.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.5.1:*:*:*:*:*:*:* Versions 17.5.1 Vulnerable ·Cisco
- cpe:2.3:h:cisco:catalyst_9800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9800-40:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9800-40_wireless_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 7 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:cisco:catalyst_9800-80:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9800-80_wireless_controller:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9800-cl:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9800-l:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9800-l-c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9800-l-f:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9800_embedded_wireless_controller:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:h:cisco:catalyst_9800-80:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9800-80_wireless_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9800-cl:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9800-l:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9800-l-c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9800-l-f:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9800_embedded_wireless_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Cisco IOS XE Software — 20210922 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Denial of Service Vulnerabilities
3 records Highest priority Priority MEDIUM 3 MEDIUM
Other records, highest priority first
- TI-2021-01289 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Denial of Service VulnerabilitiesPriority MEDIUM 48
- TI-2021-13766 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Denial of Service VulnerabilitiesPriority MEDIUM 46
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34769
- 2026-10-03 Alias added: GHSA-hw4w-cm9x-6hg5
References
More Cisco Ios Xe vulnerabilities
- TI-2023-06904 Cisco is providing an update for the ongoing investigation into observed exploitation of… KEVCVSS 3.1CRITICAL 10.0
- TI-2018-00122 Memory corruption in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
- TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
- TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
- TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
- TI-2017-04497 Memory corruption in Cisco IOS XE Software KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2021-34769 · CVE Program
- CVE-2021-34769 · NVD
- FIRST EPSS
- GHSA-hw4w-cm9x-6hg5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences