What is CVE-2019-1920?

CVE-2019-1920 is a high-severity vulnerability in Cisco Access Points, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2019-07-17.

How severe is CVE-2019-1920?

High severity. CVSS v3 base score is 7.4 out of 10.

Improper input validation in Cisco Access Points

CVE-2019-1920

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2019-07-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (55.7th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Cisco Access Points
Cisco Aironet 3700e
Cisco Aironet 3700e Firmware — versions 15.3\(3\)jc14, 15.3(3)jc14, 15.3(3)jd6
Cisco Aironet 3700i
Cisco Aironet 3700i Firmware — versions 15.3\(3\)jc14, 15.3(3)jc14, 15.3(3)jd6
Cisco Aironet 3700p
Cisco Aironet 3700p Firmware — versions 15.3\(3\)jc14, 15.3(3)jc14, 15.3(3)jd6
Cisco Aironet Access Point Software — versions unspecified

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190717… (vendor-advisory, Vendor Advisory)
www.securityfocus.com/bid/109312 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2019-1920?: CVE-2019-1920 is a high-severity vulnerability in Cisco Access Points, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2019-07-17.
How severe is CVE-2019-1920?: High severity. CVSS v3 base score is 7.4 out of 10.