CVE-2020-3231

lowpriority · track · 19OT risk · elevatedEPSS 0.005 · 39 %ileEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.45% (39th) EPSS
CVSS 2.9 · low
Is it mine?
72 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

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.

01

remediations

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

A vendor fix is available.

02

cvss

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

4.7
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.9–4.7

v2.02.9lowAV:A/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 5.5 · impact 2.9
v3.14.7mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 1.4
v3.04.7mediumCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:Nsecondary · ENISA EU
v3.04.7mediumCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:Nsecondary · psirt@cisco.com USexploitability 2.8 · impact 1.4
v3.04.7mediumCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:Nsecondary · Cisco PSIRT US
v3.14.7mediumAV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:Nsecondary · FSTEC (BDU) RU
v3.14.3mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)
03

ssvc

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

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USprimaryCWE-284USCWE-284US
05

affected products (72)

Products and version ranges known to be affected.

showing 20 of 72
06

advisories (1)

Vendor and ecosystem advisories describing this.

  • cisco-sa-c2960L-DpWA9Re4Cisco IOS Software for Catalyst 2960-L Series Switches and Catalyst CDB-8P Switches 802.1X Authentication Bypass Vulnerability2020-06-03csaf · cisco_csafUS

    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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c2960L-DpWA9Re4 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c2960L-DpWA9Re4"]

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducisco_csafNVDCVE.orgMITRE
published 2020-06-03modified 2026-06-17
10

references (5)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan