CVE-2020-3231 json
Cisco IOS Software for Catalyst 2960-L Series Switches and Catalyst CDB-8P Switches 802.1X Authentication Bypass Vulnerability
published 2020-06-03 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-24502
- cvss
- 4.7
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 39%
- public exploits
- 0
- none known
Summary
A vulnerability in the 802.1X feature of Cisco Catalyst 2960-L Series Switches and Cisco Catalyst CDB-8P Switches could allow an unauthenticated, adjacent attacker to forward broadcast traffic before being authenticated on the port. The vulnerability exists because broadcast traffic that is received on the 802.1X-enabled port is mishandled. An attacker could exploit this vulnerability by sending broadcast traffic on the port before being authenticated. A successful exploit could allow the attacker to send and receive broadcast traffic on the 802.1X-enabled port before authentication.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 23 mo ago
Exploit prediction
0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 4.7 | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N |
| NVD | 3.1 | 4.7 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N |
| NVD | 2.0 | 2.9 | AV:A/AC:M/Au:N/C:P/I:N/A:N |
Affected products
- Cisco Cisco IOS 15.2(5a)E
Classification
- Weakness
- Technology feeds
References
-
tools.cisco.com
/security/center/content/CiscoSecurityAdvisory/cisco-sa-c2960L-DpWA9Re4
vendor-advisory, patch
Sources
- CVE List CVE-2020-3231
- NVD CVE-2020-3231
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