CVE-2020-3492

highpriority · track · 34EPSS 0.014 · 72 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.37% (72nd) EPSS

CVSS 7.8 · high

Is it mine?

19 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in the Flexible NetFlow Version 9 packet processor of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers and Cisco AireOS Software for Cisco Wireless LAN Controllers (WLC) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of certain parameters in a Flexible NetFlow Version 9 record. An attacker could exploit this vulnerability by spoofing the address of an existing Access Point on the network and sending a Control and Provisioning of Wireless Access Points (CAPWAP) packet that includes a crafted Flexible NetFlow Version 9 record to an affected device. A successful exploit could allow the attacker to cause a process crash that would lead to a reload of the device.

remediations

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

A vendor fix is available.

Fixed16.10.1cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.10.1ecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.10.1scisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.11.1cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.11.1acisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.11.1bcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.11.1ccisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.12.1cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.12.1scisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed16.12.1tcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Wireless LAN Controller (WLC) 8.10.105.0 when installed on Cisco 3500 Series Wireless Controllerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Wireless LAN Controller (WLC) 8.10.105.0 when installed on Cisco 5500 Series Wireless Controllerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Wireless LAN Controller (WLC) 8.10.105.0 when installed on Cisco 8500 Series Wireless Controllerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Wireless LAN Controller (WLC) 8.10.105.0 when installed on Cisco Virtual Wireless Controllercisco_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

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

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · psirt@cisco.com USexploitability 3.9 · impact 4

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · Cisco PSIRT US

v3.18.6highAV:N/AC:L/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.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

affected products (19)

Products and version ranges known to be affected.

Cisco Wireless LAN Controller (WLC) 8.10.105.0 when installed on Cisco 3500 Series Wireless Controllersall versionscisco_csafUS
Cisco Wireless LAN Controller (WLC) 8.10.105.0 when installed on Cisco 5500 Series Wireless Controllersall versionscisco_csafUS
Cisco Wireless LAN Controller (WLC) 8.10.105.0 when installed on Cisco 8500 Series Wireless Controllersall versionscisco_csafUS
Cisco Wireless LAN Controller (WLC) 8.10.105.0 when installed on Cisco Virtual Wireless Controllerall versionscisco_csafUS
Cisco 16.10.1all versionscisco_csafUS
Cisco 16.10.1eall versionscisco_csafUS
Cisco 16.10.1sall versionscisco_csafUS
Cisco 16.11.1all versionscisco_csafUS
Cisco 16.11.1aall versionscisco_csafUS
Cisco 16.11.1ball versionscisco_csafUS
Cisco 16.11.1call versionscisco_csafUS
Cisco 16.12.1all versionscisco_csafUS
Cisco 16.12.1sall versionscisco_csafUS
Cisco 16.12.1tall versionscisco_csafUS
Cisco Cisco Wireless LAN Controller (WLC)≤ n/aenisa_euvdEU
Cisco Systems Inc. Cisco IOS XE≤ 16.12.1fstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 16.11.1fstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 16.10.1fstec_bduRU
cisco ios xe= 16.12.1nvdUScpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-iosxe-wlc-fnfv9-EvrAQpNXCisco IOS XE Software for Catalyst 9800 Series and Cisco AireOS Software for Cisco WLC Flexible NetFlow Version 9 Denial of Service Vulnerability2020-09-24csaf · cisco_csafUS
A vulnerability in the Flexible NetFlow Version 9 packet processor of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers and Cisco AireOS Software for Cisco Wireless LAN Controllers (WLC) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of certain parameters in a Flexible NetFlow Version 9 record. An attacker could exploit this vulnerability by spoofing the address of an existing Access Point on the network and sending a Control and Provisioning of Wireless Access Points (CAPWAP) packet that includes a crafted Flexible NetFlow Version 9 record to an affected device. A successful exploit could allow the attacker to cause a process crash that would lead to a reload of the device. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of the September 24, 2020, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 34 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: September 2020 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74268"].

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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+25171 more

references (7)

External citations — patches, advisories, analysis.

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