TI-2019-01540 Aliases CVE-2019-1920 GHSA-4w9g-6vm8-cmqg

Cisco IOS Access Points Software 802.11r Fast Transition Denial of Service Vulnerability

LOW 34CWE-20Published 2019-07-17 · Updated 2024-11-21

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: Fixed

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

Summary

A vulnerability in the 802.11r Fast Transition (FT) implementation for Cisco IOS Access Points (APs) Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected interface. The vulnerability is due to a lack of complete error handling condition for client authentication requests sent to a targeted interface configured for FT. An attacker could exploit this vulnerability by sending crafted authentication request traffic to the targeted interface, causing the device to restart unexpectedly.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00797 56th percentileScored 2026-11-07

Fix Fixed Cisco Aironet Access Point Software (Cisco): 8.8.100.0

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 Aironet Access Point Software	before 8.8.100.0	8.8.100.0	Patch available	CNA

Cisco Aironet Access Point Software VendorCisco Affected before 8.8.100.0 Fixed in 8.8.100.0 Patch available CNA

CPE configurations NVD · 10

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:aironet_3700e_firmware:15.3\(3\)jc14:::::::*	15.3(3)jc14	Vulnerable	Cisco
cpe:2.3:o:cisco:aironet_3700e_firmware:15.3\(3\)jd6:::::::*	15.3(3)jd6	Vulnerable	Cisco
cpe:2.3:h:cisco:aironet_3700e:-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:o:cisco:aironet_3700i_firmware:15.3\(3\)jc14:::::::*	15.3(3)jc14	Vulnerable	Cisco
cpe:2.3:o:cisco:aironet_3700i_firmware:15.3\(3\)jd6:::::::*	15.3(3)jd6	Vulnerable	Cisco
cpe:2.3:h:cisco:aironet_3700i:-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:o:cisco:aironet_3700p_firmware:15.3\(3\)jc14:::::::*	15.3(3)jc14	Vulnerable	Cisco
cpe:2.3:o:cisco:aironet_3700p_firmware:15.3\(3\)jd6:::::::*	15.3(3)jd6	Vulnerable	Cisco
cpe:2.3:h:cisco:aironet_3700p:-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:o:cisco:access_points::::::::	before 8.2.170.0; 8.3 to before 8.3.150.0; 8.4 to before 8.5.131.0; 8.6 to before 8.8.100.0	Vulnerable	Cisco

cpe:2.3:o:cisco:aironet_3700e_firmware:15.3\(3\)jc14:*:*:*:*:*:*:* Versions 15.3(3)jc14 Vulnerable ·Cisco
cpe:2.3:o:cisco:aironet_3700e_firmware:15.3\(3\)jd6:*:*:*:*:*:*:* Versions 15.3(3)jd6 Vulnerable ·Cisco
cpe:2.3:h:cisco:aironet_3700e:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:o:cisco:aironet_3700i_firmware:15.3\(3\)jc14:*:*:*:*:*:*:* Versions 15.3(3)jc14 Vulnerable ·Cisco
cpe:2.3:o:cisco:aironet_3700i_firmware:15.3\(3\)jd6:*:*:*:*:*:*:* Versions 15.3(3)jd6 Vulnerable ·Cisco
cpe:2.3:h:cisco:aironet_3700i:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:o:cisco:aironet_3700p_firmware:15.3\(3\)jc14:*:*:*:*:*:*:* Versions 15.3(3)jc14 Vulnerable ·Cisco
cpe:2.3:o:cisco:aironet_3700p_firmware:15.3\(3\)jd6:*:*:*:*:*:*:* Versions 15.3(3)jd6 Vulnerable ·Cisco
cpe:2.3:h:cisco:aironet_3700p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:o:cisco:access_points:*:*:*:*:*:*:*:* Versions before 8.2.170.0; 8.3 to before 8.3.150.0; 8.4 to before 8.5.131.0; 8.6 to before 8.8.100.0 Vulnerable ·Cisco

Remediation

Fix · CNA Cisco Aironet Access Point Software (Cisco) Fixed in 8.8.100.0

Timeline

2026-10-02 Threatist record created from CVE-2019-1920
2026-10-03 Alias added: GHSA-4w9g-6vm8-cmqg

References

Advisory 1

20190717 Cisco IOS Access Points Software 802.11r Fast Transition Denial of Service Vulnerability

TI-2020-03104 Cisco Aironet Access Points UDP Flooding Denial of Service Vulnerability CVSS 3.1HIGH 8.6
TI-2020-03103 Cisco Aironet Access Point Authentication Flood Denial of Service Vulnerability CVSS 3.1HIGH 8.6
TI-2018-00400 Cisco IOS Access Points Software 802.11r Fast Transition Denial of Service Vulnerability CVSS 3.0HIGH 7.4
TI-2020-03096 Cisco Aironet Access Points Ethernet Wired Clients Denial of Service Vulnerability CVSS 3.1HIGH 7.4

Sources

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