TI-2020-03035 Aliases CVE-2020-3489 GHSA-6636-7w3v-fv4q

Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Service Vulnerabilities

LOW 33CWE-20Published 2020-09-24 · Updated 2024-11-13

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

Multiple vulnerabilities in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition of an affected device. These vulnerabilities are due to insufficient validation of CAPWAP packets. An attacker could exploit these 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 on the affected device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00507 43rd 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: No
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 · 7

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:ios_xe:16.12.1:::::::*	16.12.1	Vulnerable	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: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:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:* Versions 16.12.1 Vulnerable ·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
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

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 · 2020-09-24
Cisco IOS XE Software — 20200924 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Service Vulnerabilities
7 records Highest priority Priority LOW 7 LOW
Other records, highest priority first
- TI-2020-03043 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Service VulnerabilitiesPriority LOW 33
- TI-2020-03040 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Service VulnerabilitiesPriority LOW 33
- TI-2020-03039 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Service VulnerabilitiesPriority LOW 33
Show all 7 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2020-3489
2026-10-03 Alias added: GHSA-6636-7w3v-fv4q

References

Advisory 1

20200924 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Service 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

See all 561 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences