Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Service Vulnerability
Priority MEDIUM 46CWE-126Published · 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-126 and the CVSS impact.
Summary
A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Wireless Controller Software for the Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition of an affected device. The vulnerability is due to insufficient validation of CAPWAP packets. An attacker could exploit this vulnerability 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 0.01546 75th 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
- Partial
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 · 32
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:* | 16.10.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:* | 16.10.1e | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:* | 16.10.1s | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:* | 16.11.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.11.1a:*:*:*:*:*:*:* | 16.11.1a | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:* | 16.11.1b | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.11.1c:*:*:*:*:*:*:* | 16.11.1c | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.11.2:*:*:*:*:*:*:* | 16.11.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:* | 16.12.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:* | 16.12.1s | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:* Versions 16.10.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:* Versions 16.10.1e Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:* Versions 16.10.1s Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:* Versions 16.11.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.11.1a:*:*:*:*:*:*:* Versions 16.11.1a Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:* Versions 16.11.1b Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.11.1c:*:*:*:*:*:*:* Versions 16.11.1c Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.11.2:*:*:*:*:*:*:* Versions 16.11.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:* Versions 16.12.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:* Versions 16.12.1s Vulnerable ·Cisco
Show 22 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xe:16.12.1t:*:*:*:*:*:*:* | 16.12.1t | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.2s:*:*:*:*:*:*:* | 16.12.2s | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.2t:*:*:*:*:*:*:* | 16.12.2t | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.3:*:*:*:*:*:*:* | 16.12.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.3s:*:*:*:*:*:*:* | 16.12.3s | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.4:*:*:*:*:*:*:* | 16.12.4 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.4a:*:*:*:*:*:*:* | 16.12.4a | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:* | 17.1.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:* | 17.1.1s | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:* | 17.1.1t | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.1.2:*:*:*:*:*:*:* | 17.1.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:* | 17.2.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:* | 17.2.1a | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:* | 17.2.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:* | 17.3.1 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:catalyst_9300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9500:-:*:*:*:*:*:*:* | 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_9800-80:-:*:*:*:*:*:*:* | 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:o:cisco:ios_xe:16.12.1t:*:*:*:*:*:*:* Versions 16.12.1t Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.2s:*:*:*:*:*:*:* Versions 16.12.2s Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.2t:*:*:*:*:*:*:* Versions 16.12.2t Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.3:*:*:*:*:*:*:* Versions 16.12.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.3s:*:*:*:*:*:*:* Versions 16.12.3s Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.4:*:*:*:*:*:*:* Versions 16.12.4 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.4a:*:*:*:*:*:*:* Versions 16.12.4a Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:* Versions 17.1.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:* Versions 17.1.1s Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:* Versions 17.1.1t Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.1.2:*:*:*:*:*:*:* Versions 17.1.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:* Versions 17.2.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:* Versions 17.2.1a Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:* Versions 17.2.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:* Versions 17.3.1 Vulnerable ·Cisco
- cpe:2.3:h:cisco:catalyst_9300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9500:-:*:*:*:*:*:*:* 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_9800-80:-:*:*:*:*:*:*:* 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
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-1373
- 2026-10-03 Alias added: GHSA-m962-hc84-g96g
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-2021-1373 · CVE Program
- CVE-2021-1373 · NVD
- FIRST EPSS
- GHSA-m962-hc84-g96g · 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