How severe is CVE-2019-1920?

CVE-2019-1920 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-1920 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-1920?

CVE-2019-1920 primarily affects Cisco Aironet 3700e Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-1920?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-1920 published?

CVE-2019-1920 was published on 2019-07-17 and last updated on 2026-06-17.

CVE-2019-1920

CVE-2019-1920 is a high-severity vulnerability in Cisco Aironet 3700e Firmware with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 6.1
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Aironet 3700e Firmware
Published: 2019-07-17
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2019-1920?: CVE-2019-1920 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-1920 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-1920?: CVE-2019-1920 primarily affects Cisco Aironet 3700e Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-1920?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-1920 published?: CVE-2019-1920 was published on 2019-07-17 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:o:cisco:aironet_3700e_firmware:15.3\(3\)jc14:*:*:*:*:*:*:*
cpe:2.3:o:cisco:aironet_3700e_firmware:15.3\(3\)jd6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:aironet_3700i_firmware:15.3\(3\)jc14:*:*:*:*:*:*:*
cpe:2.3:o:cisco:aironet_3700i_firmware:15.3\(3\)jd6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:aironet_3700p_firmware:15.3\(3\)jc14:*:*:*:*:*:*:*
cpe:2.3:o:cisco:aironet_3700p_firmware:15.3\(3\)jd6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:access_points:*:*:*:*:*:*:*:*

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