CVE-2019-1920 | Cisco IOS Access Points Software 802.11r Fast Transition Denial of Service Vulnerability

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.

Published: 2019-07-17 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-1920 is rated Moderate Risk (47.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.80%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-1920

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.92% 0.80% -0.12%
2 2025-09-06 0.71% 0.92% +0.21%
3 2025-03-30 — 0.71% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-1920

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.4 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 4.0 [email protected]
7.4 3.0 HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 4.0 [email protected]
6.1 2.0 MEDIUM
AV:A/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 6.5 6.9 [email protected]

Weakness enumeration for CVE-2019-1920

Affected software / configurations for CVE-2019-1920

Vendor Product Version Raw CPE
cisco aironet_3700e_firmware 15.3\(3\)jc14 cpe:2.3:o:cisco:aironet_3700e_firmware:15.3\(3\)jc14:*:*:*:*:*:*:*
cisco aironet_3700e_firmware 15.3\(3\)jd6 cpe:2.3:o:cisco:aironet_3700e_firmware:15.3\(3\)jd6:*:*:*:*:*:*:*
cisco aironet_3700i_firmware 15.3\(3\)jc14 cpe:2.3:o:cisco:aironet_3700i_firmware:15.3\(3\)jc14:*:*:*:*:*:*:*
cisco aironet_3700i_firmware 15.3\(3\)jd6 cpe:2.3:o:cisco:aironet_3700i_firmware:15.3\(3\)jd6:*:*:*:*:*:*:*
cisco aironet_3700p_firmware 15.3\(3\)jc14 cpe:2.3:o:cisco:aironet_3700p_firmware:15.3\(3\)jc14:*:*:*:*:*:*:*
cisco aironet_3700p_firmware 15.3\(3\)jd6 cpe:2.3:o:cisco:aironet_3700p_firmware:15.3\(3\)jd6:*:*:*:*:*:*:*
cisco access_points < 8.2.170.0 cpe:2.3:o:cisco:access_points:*:*:*:*:*:*:*:*
cisco access_points >= 8.3, < 8.3.150.0 cpe:2.3:o:cisco:access_points:*:*:*:*:*:*:*:*
cisco access_points >= 8.4, < 8.5.131.0 cpe:2.3:o:cisco:access_points:*:*:*:*:*:*:*:*
cisco access_points >= 8.6, < 8.8.100.0 cpe:2.3:o:cisco:access_points:*:*:*:*:*:*:*:*

References for CVE-2019-1920

cvelogic Threat Intelligence