TI-2020-02941 Aliases CVE-2020-3390 GHSA-hwvf-grj2-9364

Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family SNMP Trap Denial of Service Vulnerability

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

A vulnerability in Simple Network Management Protocol (SNMP) trap generation for wireless clients of the Cisco IOS XE Wireless Controller Software for the Cisco Catalyst 9000 Family could allow an unauthenticated, adjacent attacker to cause the device to unexpectedly reload, causing a denial of service (DoS) condition on an affected device. The vulnerability is due to the lack of input validation of the information used to generate an SNMP trap in relation to a wireless client connection. An attacker could exploit this vulnerability by sending an 802.1x packet with crafted parameters during the wireless authentication setup phase of a connection. A successful exploit could allow the attacker to cause the device to reload, causing a DoS condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00639 50th percentileScored 2026-11-08

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.

Timeline

2026-10-02 Threatist record created from CVE-2020-3390
2026-10-03 Alias added: GHSA-hwvf-grj2-9364
2026-10-24 EPSS moved to the 50th–90th percentile

References

Advisory 1

20200924 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family SNMP Trap Denial of Service Vulnerability

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