CVE-2020-3559

highpriority · track · 34EPSS 0.014 · 72 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.40% (72nd) EPSS

CVSS 7.8 · high

Is it mine?

14 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in Cisco Aironet Access Point (AP) Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper handling of clients that are trying to connect to the AP. An attacker could exploit this vulnerability by sending authentication requests from multiple clients to an affected device. A successful exploit could allow the attacker to cause the affected device to reload.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Aironet Access Point Softwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Aironet Access Point Software (IOS XE Controller)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Business Wireless Access Point Softwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

8.6

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.6

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 4

v3.06.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU

v3.06.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · psirt@cisco.com USexploitability 2.2 · impact 4

v3.06.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · Cisco PSIRT US

v3.16.8mediumAV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.9highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USprimaryCWE-400US

affected products (14)

Products and version ranges known to be affected.

Cisco Cisco Aironet Access Point Softwareall versionscisco_csafUS
Cisco Cisco Aironet Access Point Software (IOS XE Controller)all versionscisco_csafUS
Cisco Cisco Business Wireless Access Point Softwareall versionscisco_csafUS
Cisco Cisco Aironet Access Point Software≤ n/aenisa_euvdEU
Cisco Systems Inc. Cisco Access Points≤ 16.12.4afstec_bduRU
Cisco Systems Inc. Cisco Business Access Points≤ 10.1.1.0fstec_bduRU
Cisco Systems Inc. Wireless LAN controller≤ 8.5.160.0fstec_bduRU
Cisco Systems Inc. Wireless LAN controller8.6 → 8.8.130.0fstec_bduRU
Cisco Systems Inc. Wireless LAN controller8.9 → 8.10.112.0fstec_bduRU
cisco access points< 16.12.4anvdUScpe:2.3:o:cisco:access_points:*:*:*:*:*:*:*:*
cisco aironet access point software= 17.2.0.26nvdUScpe:2.3:a:cisco:aironet_access_point_software:*:*:*:*:*:*:*:*
cisco aironet access point software= 8.5(151.0)nvdUScpe:2.3:a:cisco:aironet_access_point_software:*:*:*:*:*:*:*:*
cisco business access points10.0 → 10.1.1.0nvdUScpe:2.3:a:cisco:business_access_points:*:*:*:*:*:*:*:*
cisco wireless lan controller8.9 → 8.10.112.0nvdUScpe:2.3:o:cisco:wireless_lan_controller:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-aironet-dos-h3DCuLXwCisco Aironet Access Point Authentication Flood Denial of Service Vulnerability2020-09-24csaf · cisco_csafUS
A vulnerability in Cisco Aironet Access Point (AP) Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper handling of clients that are trying to connect to the AP. An attacker could exploit this vulnerability by sending authentication requests from multiple clients to an affected device. A successful exploit could allow the attacker to cause the affected device to reload. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2020-09-24modified 2026-06-17

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references (7)

External citations — patches, advisories, analysis.

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