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CVE-2019-1920

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

HIGH
7.4
CVSS Score
Published: July 17, 2019 at 08:20 PM UTC
Updated: June 17, 2026 at 02:29 AM UTC
8 products affected across 1 vendorAccess PointsAironet 3700E FirmwareAironet 3700I Firmware

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Severity
HIGH7.4
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Access Points· Cisco
95%
v < 8.2.170.08.3 ≤ v < 8.3.150.08.4 ≤ v < 8.5.131.08.6 ≤ v < 8.8.100.0
Affected range stops below 8.2.170.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.3.150.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.5.131.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.8.100.0, so it looks safe — our inference, not a vendor statement
Aironet 3700E Firmware· Cisco
95%
15.3(3)jc1415.3(3)jd6
cisco-aironet-3700e (same device)
Aironet 3700I Firmware· Cisco
95%
15.3(3)jc1415.3(3)jd6
cisco-aironet-3700i (same device)
Aironet 3700P Firmware· Cisco
95%
15.3(3)jc1415.3(3)jd6
cisco-aironet-3700p (same device)
Aironet Access Point· Cisco
60%
v < 8.8.100.0
Affected range stops below 8.8.100.0, so it looks safe — our inference, not a vendor statement
Aironet 3700E· Ciscodevice
80%
All versions
Aironet 3700I· Ciscodevice
80%
All versions
Aironet 3700P· Ciscodevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

VDB Entryx_refsource_BIDThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/109312
Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190717-aironet-dos

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGH[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20NVD-CWE-Other

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