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CVE-2020-3559

27
FAUCET Score

CVE-2020-3559 describes a denial-of-service vulnerability in Cisco Aironet Access Point (AP) Software. An unauthenticated, remote attacker can trigger a device reload by sending multiple authentication requests from various clients to the affected AP. This vulnerability carries a CVSS score of 8.6 (High), indicating a significant impact on availability with low attack complexity and no user interaction required. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.9, < 8.10.112.0CPE matchmatch criteria
cpe:2.3:o:cisco:wireless_lan_controller:*:*:*:*:*:*:*:*
>= 10.0, < 10.1.1.0CPE matchmatch criteria
cpe:2.3:a:cisco:business_access_points:*:*:*:*:*:*:*:*
< 16.12.4aCPE matchmatch criteria
cpe:2.3:o:cisco:access_points:*:*:*:*:*:*:*:*
8.5\(151.0\)CPE matchmatch criteria
cpe:2.3:a:cisco:aironet_access_point_software:8.5\(151.0\):*:*:*:*:*:*:*
17.2.0.26CPE matchmatch criteria
cpe:2.3:a:cisco:aironet_access_point_software:17.2.0.26:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.8MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.40%
Probability of exploitation in next 30 days
EPSS Percentile
69.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0140 is in the 51st percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-dos-h3DCuLXw
Vendor Advisory