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TI-2020-02791 Aliases CVE-2020-3231GHSA-q4w2-p3xv-w8vf

Improper access control in Cisco IOS 15.2 E

Priority LOW 22CWE-284Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-284.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00451 39th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco IOS 15.2(5a)Eall versions—No fix listedCNA
  • Cisco IOS 15.2(5a)E VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 22

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios:15.2\(5\)e2:*:*:*:*:*:*:*15.2(5)e2VulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(5\)ex:*:*:*:*:*:*:*15.2(5)exVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(5a\)e:*:*:*:*:*:*:*15.2(5a)eVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(5b\)e:*:*:*:*:*:*:*15.2(5b)eVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(5c\)e:*:*:*:*:*:*:*15.2(5c)eVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(6\)e:*:*:*:*:*:*:*15.2(6)eVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(6\)e0c:*:*:*:*:*:*:*15.2(6)e0cVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(6\)e1:*:*:*:*:*:*:*15.2(6)e1VulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(6\)e1a:*:*:*:*:*:*:*15.2(6)e1aVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(6\)e1s:*:*:*:*:*:*:*15.2(6)e1sVulnerableCisco
  • cpe:2.3:o:cisco:ios:15.2\(5\)e2:*:*:*:*:*:*:* Versions 15.2(5)e2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(5\)ex:*:*:*:*:*:*:* Versions 15.2(5)ex Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(5a\)e:*:*:*:*:*:*:* Versions 15.2(5a)e Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(5b\)e:*:*:*:*:*:*:* Versions 15.2(5b)e Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(5c\)e:*:*:*:*:*:*:* Versions 15.2(5c)e Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e:*:*:*:*:*:*:* Versions 15.2(6)e Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e0c:*:*:*:*:*:*:* Versions 15.2(6)e0c Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e1:*:*:*:*:*:*:* Versions 15.2(6)e1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e1a:*:*:*:*:*:*:* Versions 15.2(6)e1a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e1s:*:*:*:*:*:*:* Versions 15.2(6)e1s Vulnerable ·Cisco
Show 12 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios:15.2\(6\)e2:*:*:*:*:*:*:*15.2(6)e2VulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(6\)e2b:*:*:*:*:*:*:*15.2(6)e2bVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(6\)e3:*:*:*:*:*:*:*15.2(6)e3VulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(6\)e4:*:*:*:*:*:*:*15.2(6)e4VulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(7\)e:*:*:*:*:*:*:*15.2(7)eVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(7\)e0a:*:*:*:*:*:*:*15.2(7)e0aVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(7\)e0b:*:*:*:*:*:*:*15.2(7)e0bVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(7\)e0s:*:*:*:*:*:*:*15.2(7)e0sVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(7a\)e0b:*:*:*:*:*:*:*15.2(7a)e0bVulnerableCisco
cpe:2.3:o:cisco:ios:15.2\(7b\)e0b:*:*:*:*:*:*:*15.2(7b)e0bVulnerableCisco
cpe:2.3:o:cisco:ios:15.3\(3\)jaa1:*:*:*:*:*:*:*15.3(3)jaa1VulnerableCisco
cpe:2.3:o:cisco:ios:15.3\(3\)jpj:*:*:*:*:*:*:*15.3(3)jpjVulnerableCisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e2:*:*:*:*:*:*:* Versions 15.2(6)e2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e2b:*:*:*:*:*:*:* Versions 15.2(6)e2b Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e3:*:*:*:*:*:*:* Versions 15.2(6)e3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(6\)e4:*:*:*:*:*:*:* Versions 15.2(6)e4 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(7\)e:*:*:*:*:*:*:* Versions 15.2(7)e Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(7\)e0a:*:*:*:*:*:*:* Versions 15.2(7)e0a Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(7\)e0b:*:*:*:*:*:*:* Versions 15.2(7)e0b Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(7\)e0s:*:*:*:*:*:*:* Versions 15.2(7)e0s Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(7a\)e0b:*:*:*:*:*:*:* Versions 15.2(7a)e0b Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.2\(7b\)e0b:*:*:*:*:*:*:* Versions 15.2(7b)e0b Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.3\(3\)jaa1:*:*:*:*:*:*:* Versions 15.3(3)jaa1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:15.3\(3\)jpj:*:*:*:*:*:*:* Versions 15.3(3)jpj Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-3231
  2. 2026-10-03 Alias added: GHSA-q4w2-p3xv-w8vf

References

Patch 1

  • TI-2018-00138 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-09019 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
  • TI-2017-04499 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
  • TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
See all 617 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences