CVE-2020-3221
No exploitation reported by the sources we read.
- Published2020-06-03
- WeaknessCWE-20
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A vulnerability in the Flexible NetFlow Version 9 packet processor of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of parameters in a Flexible NetFlow Version 9 record. An attacker could exploit this vulnerability by sending a malformed Flexible NetFlow Version 9 packet to the Control and Provisioning of Wireless Access Points (CAPWAP) data port of an affected device. An exploit could allow the attacker to trigger an infinite loop, resulting in a process crash that would cause a reload of the device.
Timeline
dates in UTC- 2020-06-0318:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-3221?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-3221?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 16.10 | = 16.10.1 | no fix published | NVD |
| 16.10 | = 16.10.1a | no fix published | NVD |
| 16.10 | = 16.10.1b | no fix published | NVD |
| 16.10 | = 16.10.1e | no fix published | NVD |
| 16.10 | = 16.10.1s | no fix published | NVD |
| 16.10 | = 16.10.2 | no fix published | NVD |
| 16.11 | = 16.11.1 | no fix published | NVD |
| 16.11 | = 16.11.1a | no fix published | NVD |
| 16.11 | = 16.11.1b | no fix published | NVD |
| 16.11 | = 16.11.1c | no fix published | NVD |
| 16.11 | = 16.11.1s | no fix published | NVD |
| 16.12 | = 16.12.1 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- tools.cisco.comPatch · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Published
- 2020-06-03
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-3221?
Is CVE-2020-3221 actively exploited?
What is the CVSS score for CVE-2020-3221?
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Same product first, then the same vendor advisory and the same publication week.